StarCluster 0.91 Released - Scientific Computing on Amazon EC2
Hi All, The next version, 0.91, of StarCluster (http://web.mit.edu/starcluster) has been released. StarCluster is a utility for creating and managing scientific computing clusters hosted on Amazon's Elastic Compute Cloud (EC2). StarCluster utilizes Amazon's EC2 web service to create and destroy clusters of Linux virtual machines on demand. New in this version: * support for launching and managing multiple clusters on EC2 * added listclusters command for showing all active clusters on EC2 * support for attaching and NFS-sharing multiple EBS volumes * added createimage and createvolume commands for easily creating new AMIs and EBS volumes for use with StarCluster * experimental support for launching clusters using spot instances * added support for StarCluster plugins that provide the ability to perform additional configuration/setup routines on top of StarCluster's default cluster configuration * added listpublic command for listing all available public StarCluser AMIs that can be used with StarCluster * bash/zsh command line completion for StarCluster's command line interface Download StarCluster is available on PyPI (http://pypi.python.org/pypi/StarCluster) and also on the website: http://web.mit.edu/starcluster You will find the docs as well as links to the StarCluster mailing list on the website. Learn More - For those that are interested in learning more there is an article about StarCluster on www.hpcinthecloud.com http://www.hpcinthecloud.com/features/StarCluster-Brings-HPC-to-the-Amazon-Cloud-94099324.html There is also a screencast of installing, configuring, launching, and terminating an HPC cluster on Amazon EC2: http://www.hpcinthecloud.com/blogs/MITs-StarCluster-An-Update-with-Screencast-94599554.html StarCluster Description (From PYPI): StarCluster is a utility for creating and managing computing clusters hosted on Amazon's Elastic Compute Cloud (EC2). StarCluster utilizes Amazon's EC2 web service to create and destroy clusters of Linux virtual machines configured for scientific computing on demand. To get started, the user creates a simple configuration file with their AWS account details and a few cluster preferences (e.g. number of machines, machine type, ssh keypairs, etc). After creating the configuration file and running StarCluster's start command, a cluster of Linux machines configured with the Sun Grid Engine queuing system, an NFS-shared /home directory, and OpenMPI with password-less ssh is created and ready to go out-of-the-box. Running StarCluster's stop command will shutdown the cluster and stop paying for service. This allows the user to only pay for what they use. StarCluster can also utilize Amazon's Elastic Block Storage (EBS) volumes to provide persistent data storage for a cluster. EBS volumes allow you to store large amounts of data in the Amazon cloud and are also easy to back-up and replicate in the cloud. StarCluster will mount and NFS-share any volumes specified in the config. StarCluster's createvolume command provides the ability to automatically create, format, and partition new EBS volumes for use with StarCluster. StarCluster provides a Ubuntu-based Amazon Machine Image (AMI) in 32bit and 64bit architectures. The AMI contains an optimized NumPy/SciPy/Atlas/Blas/Lapack installation compiled for the larger Amazon EC2 instance types. The AMI also comes with Sun Grid Engine (SGE) and OpenMPI compiled with SGE support. The public AMI can easily be customized by launching a single instance of the public AMI, installing additional software on the instance, and then using StarCluster's createimage command to completely automate the process of creating a new AMI from an EC2 instance. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
asciitable 0.2.4: an extensible ASCII table reader
I'm pleased to announce the release of version 0.2.4 of the asciitable module. Please see the project home page or PyPI for download and documentation: http://cxc.harvard.edu/contrib/asciitable/ At the top level asciitable looks like many other ASCII table readers since it provides a default read() function with a long list of parameters to accommodate the many variations possible in commonly encountered ASCII table formats. But unlike other monolithic table reader implementations, asciitable is based on a modular and extensible class structure. Formats that cannot be handled by the existing hooks in the read() function can be accomodated by modifying the underlying class methods as needed. Asciitable can read a wide range of ASCII table formats via built-in Extension Reader Classes (derived from base class elements): * Basic: basic table with customizable delimiters and header configurations * Cds: CDS format table (also Vizier and ApJ machine readable tables) * CommentedHeader: column names given in a line that begins with the comment character * Daophot: table from the IRAF DAOphot package * Ipac: IPAC format table * NoHeader: basic table with no header where columns are auto-named * Rdb: tab-separated values with an extra line after the column definition line * Tab: tab-separated values Copyright: Smithsonian Astrophysical Observatory (2010) Author: Tom Aldcroft (aldcr...@head.cfa.harvard.edu) License: BSD (3-clause) -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Tryton 1.6 series is out
Tryton is a three-tiers high-level general purpose application platform under the license GPL-3 written in Python and using PostgreSQL as main database engine. It is the core base of a complete business solution providing modularity, scalability and security. This new release comes with the support of MySQL and various improvements and polishing of the framework. As always database migration is ensured from any previous version. This release also marks the end of support for the 1.0 series. The most noteworthy new features are: - The add of MySQL support as DBMS - Some new modules: - Calendar Scheduling - Dashboard - Project Plan - The Russian translation - The security enforcement with fingerprint and CA checks for SSL - The introduction of PYSON[1] for dynamic domain - The add of JSON-RPC protocol - The lazy load of fields in Export/Import windows - The usage of python-dateutil instead of egenix-mx-base - A versioned configuration directory for the client - A bundle of Neso (standalone version of Tryton) for MacOSX - The digits validation on numeric fields[2] - The usage of singleton model[3] for various sequences configuration - Some speed improvements of the report engine A more complete list of the new features on: http://www.tryton.org/news.html#d2010-05-17 :Homepage: http://www.tryton.org/ :Downloads: http://www.tryton.org/downloads.html :Screenshots: http://www.tryton.org/screenshots.html :Demo: http://www.tryton.org/demo.html [1] http://doc.tryton.org/1.6/trytond/doc/topics/pyson.html [2] http://doc.tryton.org/1.6/trytond/doc/ref/models/fields.html#numeric [3] http://doc.tryton.org/1.6/trytond/doc/ref/models/models.html#trytond.model.ModelSingleton -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Nagare IDE 0.1.0 - Pure Web IDE for the Nagare framework
Hi all, I'm pleased to announce that the first (0.1.0) version of the Nagare IDE is released! Nagare IDE is a pure Web Integrated Development Environment dedicated to the Nagare Web framework. Using YUI, the Bespin editor, ajax and comet communications, it offers the browsing of your projects, the edition of the sources, the debugging of the raised exceptions and the consultation in real-time of the applications logs. The full documentation with screenshots and how to install it is available at http://www.nagare.org/trac/wiki/NagareIde Enjoy! A. Poirier -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: First script. Need some help
Thanks Everyone. I followed your instructions and my script is successfully copying the result to the clipboard. Now for the fun. To work out the rest of the script :) I use the IDLE IDE and not codepad.org. I just thought that was the standard for pasting scripts here in this group. Thanks all. -- http://mail.python.org/mailman/listinfo/python-list
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Re: Minor annoyances with properties
On May 27, 3:24 pm, Christian Heimes li...@cheimes.de wrote: Do I miss something? Is this the way to do it, or is there a better one? A better way was introduced in Python 2.6. Seehttp://docs.python.org/library/functions.html?highlight=property#prop... I have a Python only version around if you are still using Python 2.5. Christian Mmmm, I might still miss something. OK, I can replace my initial property using @property and @p.setter, but it doesn't seem to work in subclasses: class A(object): @property def p(self): return self._p @p.setter def _set_p(self, p): self._p = p class B(A): @p.setter def _set_p(self, p): … results in: Traceback (most recent call last): File toto.py, line 8, in module class B(A): File toto.py, line 9, in B @p.setter NameError: name 'p' is not defined -- http://mail.python.org/mailman/listinfo/python-list
Re: Minor annoyances with properties
On May 27, 8:56 pm, Francesco Bochicchio bieff...@gmail.com wrote: On 27 Mag, 14:37, eb303 eric.brunel.pragma...@gmail.com wrote: Hello all, I've been using Python properties quite a lot lately and I've found a few things that are a bit annoying about them in some cases. I wondered if I missed something or if anybody else has this kind of problems too, and if there are better solutions than the ones I'm using ATM. The first annoyance is when I want to specialize a property in a subclass. This happens quite often actually, and it is even sometimes the reason why a plain attribute is turned into a property: a subclass needs to do more things than the superclass when the property is updated for example. So, of course, my first try was: class A(object): def __init__(self): self._p = None def _get_p(self): return self._p def _set_p(self, p): self._p = p p = property(_get_p, _set_p) class B(A): def _set_p(self, p): ## Additional things here… super(B, self)._set_p(p) And of course, it doesn't work: the property has been bound to A._set_p in A, so any new definition of _set_p in any subclass does not replace the set method for the property. So I always have to add a line: p = property(A._get_p, _set_p) in the subclass too. This is a bit awkward to me, since I have to specify the superclass's name (super(…) can't be used, since it should take B as an argument, and B isn't defined yet…). Do I miss something? Is this the way to do it, or is there a better one? Don't know if is better, but you could add a level of indirection to solve it class A(object): def __init__(self): self._p = None def _get_p(self): return self._p def _set_p(self, p): self._p = p def _virtual_get_p (self): _get_p(self) def _virtual_set_p (self,v): _set_p(self, v) p = property(_virtual_get_p, _virtual_set_p) At this point, the subclasses of A can reimplement _get_p and _set_p as they like (I think) Ciao - FB Well, I've thought about that too and it should work, but that makes 2 function calls instead of one for every property access… I'd really like to avoid that. By the way, I think your 'virtual' methods should be written as: def _virtual_get_p (self): return self._get_p() def _virtual_set_p (self,v): self._set_p(v) Thanks anyway. - Eric - -- http://mail.python.org/mailman/listinfo/python-list
Re: Minor annoyances with properties
On May 27, 3:14 pm, Neil Cerutti ne...@norwich.edu wrote: On 2010-05-27, eb303 eric.brunel.pragma...@gmail.com wrote: I've been using Python properties quite a lot lately and I've found a few things that are a bit annoying about them in some cases. I wondered if I missed something or if anybody else has this kind of problems too, and if there are better solutions than the ones I'm using ATM. The first annoyance is when I want to specialize a property in a subclass. See: URI:http://infinitesque.net/articles/2005/enhancing%20Python%27s%20proper... -- Neil Cerutti *** You found a dead moose-rat. You sell the hide for $200. *** Thanks for the suggestion, but it looks a bit heavy… Performing the name lookup on the specialized object each time the property is accessed seems a bit overkill. I'd really just like a simple way to tell in the subclass: now, the setter methof for property p is this one, only that… Thanks again anyway. - Eric - -- http://mail.python.org/mailman/listinfo/python-list
Re: Minor annoyances with properties
Am 28.05.2010 11:31, schrieb eb303: On May 27, 3:24 pm, Christian Heimes li...@cheimes.de wrote: Do I miss something? Is this the way to do it, or is there a better one? A better way was introduced in Python 2.6. Seehttp://docs.python.org/library/functions.html?highlight=property#prop... I have a Python only version around if you are still using Python 2.5. Christian Mmmm, I might still miss something. OK, I can replace my initial property using @property and @p.setter, but it doesn't seem to work in subclasses: class A(object): @property def p(self): return self._p @p.setter def _set_p(self, p): self._p = p class B(A): @p.setter def _set_p(self, p): … results in: Traceback (most recent call last): File toto.py, line 8, in module class B(A): File toto.py, line 9, in B @p.setter NameError: name 'p' is not defined It doesn't work because p is not in the scope of B's body while B is created. You have to write class B(A): # access the p property from class A @A.p.setter def p(self, p): pass # once p is in the class body scope, you must not use A.p again @p.deleter def p(self): pass Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: if, continuation and indentation
On May 27, 1:57 pm, Jean-Michel Pichavant jeanmic...@sequans.com wrote: HH wrote: I have a question about best practices when it comes to line wrapping/ continuation and indentation, specifically in the case of an if statement. When I write an if statement with many conditions, I prefer to use a parenthesis around the whole block and get the implicit continuation, rather than ending each line with an escape character. Thus, using the example from the style guide (http://www.python.org/dev/peps/ pep-0008/) I would write: if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100): raise ValueError(sorry, you lose) The problem should be obvious -- it's not easy to see where the conditional ends and the statement begins since they have the same indentation. Part of the problem, I suppose, is that Emacs indents 'height' and the other lines in the conditional to 4 spaces (because of the parenthesis). How do people deal with this situation? Thanks, Henrik One possible solution if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) JM I've always liked this, or even: if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) but my co-workers have uniformly gone bananas whenever I try it. -- http://mail.python.org/mailman/listinfo/python-list
Re: if, continuation and indentation
Jonathan Hartley wrote: On May 27, 1:57 pm, Jean-Michel Pichavant jeanmic...@sequans.com wrote: HH wrote: I have a question about best practices when it comes to line wrapping/ continuation and indentation, specifically in the case of an if statement. When I write an if statement with many conditions, I prefer to use a parenthesis around the whole block and get the implicit continuation, rather than ending each line with an escape character. Thus, using the example from the style guide (http://www.python.org/dev/peps/ pep-0008/) I would write: if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100): raise ValueError(sorry, you lose) The problem should be obvious -- it's not easy to see where the conditional ends and the statement begins since they have the same indentation. Part of the problem, I suppose, is that Emacs indents 'height' and the other lines in the conditional to 4 spaces (because of the parenthesis). How do people deal with this situation? Thanks, Henrik One possible solution if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) JM I've always liked this, or even: if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) but my co-workers have uniformly gone bananas whenever I try it. I tried to give a layout that fits the OP way of doing, but I would not use what I described above, so I can understand why your co workers go bananas :) when it comes to extended conditions in if statement I prefer to write something like if self.haveLost(): raise ValueError(sorry, you lose) It drastically improves the reading because it splits the notion of what to do in which case, and how do you identify the cases (i.e. what should I do when I've lost, and how do I know that I've lost). If you don't want to pollute your upper namespace you can embed the function that way: def foo(): width = 0 height = 0 color = 'red' emphasis = 'strong' def haveLost(): return not width and not height and color == 'red' and emphasis =='strong' if haveLost(): raise ValueError(sorry you lose) It has the cool side effect to name your condition as well, that helps debugging the condition *a lot*. JM -- http://mail.python.org/mailman/listinfo/python-list
Re: if, continuation and indentation
On 28/05/2010 11:34, Jean-Michel Pichavant wrote: Jonathan Hartley wrote: On May 27, 1:57 pm, Jean-Michel Pichavant jeanmic...@sequans.com wrote: HH wrote: I have a question about best practices when it comes to line wrapping/ continuation and indentation, specifically in the case of an if statement. When I write an if statement with many conditions, I prefer to use a parenthesis around the whole block and get the implicit continuation, rather than ending each line with an escape character. Thus, using the example from the style guide (http://www.python.org/dev/peps/ pep-0008/) I would write: if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100): raise ValueError(sorry, you lose) The problem should be obvious -- it's not easy to see where the conditional ends and the statement begins since they have the same indentation. Part of the problem, I suppose, is that Emacs indents 'height' and the other lines in the conditional to 4 spaces (because of the parenthesis). How do people deal with this situation? Thanks, Henrik One possible solution if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) JM I've always liked this, or even: if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) but my co-workers have uniformly gone bananas whenever I try it. I tried to give a layout that fits the OP way of doing, but I would not use what I described above, so I can understand why your co workers go bananas :) when it comes to extended conditions in if statement I prefer to write something like if self.haveLost(): raise ValueError(sorry, you lose) It drastically improves the reading Good point. +1 for naming the condition, hooray for self-documenting code. Sometime last year at my workplace, we started referring to comments as 'lies', we now always try to use techniques like this instead of comments. -- Jonathan Hartley Made of meat. http://tartley.com tart...@tartley.com +44 7737 062 225 twitter/skype: tartley -- http://mail.python.org/mailman/listinfo/python-list
Sockets and xml problem
Hi in the following code
class MyClientHandler(SocketServer.BaseRequestHandler):
def handle(self):
print self.client_address, now( )
time.sleep(5)
while True:
xmltxt = self.request.recv(1024)--is this ok -
enough?
if not xmltxt: break
doc = minidom.parseString(data)
--- it also fails for parse(data)
rootNode = doc.documentElement
level = 0
walk(rootNode, outFile, level)
---just a function to print the xml
self.request.send('Echo=%s at %s' % (data, now( )))
rootNode = doc.documentElement
level = 0
walk(rootNode, outFile, level)
self.request.send('Echo=%s at %s' % (data, now( )))
self.request.close( )
# make a threaded server, listen/handle clients forever
myaddr = (myHost, myPort)
server = SocketServer.ThreadingTCPServer(myaddr, MyClientHandler)
server.serve_forever( )
I want to send XML messages from my client. The server sends back the
XML it receives but
the parser exits with error codes.
What am i doing wrong.
Thanks in advance
--
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Re: Yet Another MySQL Problem
On Thu, May 27, 2010 at 5:47 PM, Tim Chase python.l...@tim.thechases.comwrote:
On 05/27/2010 03:32 PM, Victor Subervi wrote:
On Thu, May 27, 2010 at 1:15 PM, Tim Chase wrote:
That should be:
', '.join(['%s'] * len(values)))
Or as I've done in the past:
', '.join('%s' for _ in values)
Huh? Can you describe that underscore to me? Fascinating!
The underscore is a valid variable-name, idiomatically used for I don't
care about this, often seen in places like tuple assignment:
a,_,_,d = some_4_element_tuple
So in my above case, it could also have been written as
', '.join('%s' for value in values)
', '.join('%s' for dont_care_about_the_value in values)
but the _ idiom means I'm iterating over 'values' but I'm not actually
using the values I get from it
I should have known. Thanks!
beno
--
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Re: Some More MySQL
On Fri, May 28, 2010 at 2:17 AM, Dennis Lee Bieber wlfr...@ix.netcom.comwrote:
On Thu, 27 May 2010 23:22:24 +0100, MRAB pyt...@mrabarnett.plus.com
declaimed the following in gmane.comp.python.general:
Placeholders which are handled by .execute shouldn't be wrapped in
quotes, even is the value is a string, because .execute will handle that
(and any other details) itself.
Even more internal details -- the MySQLdb placeholder is %s because
the adapter, internally, converts ALL parameters to strings, applies
escapes to them, and THEN wraps them with quotes before using Python
string interpolation to make the query that gets submitted to the
server.
This is why you can not use, say %d as a placeholder for a numeric
parameter... MySQLdb will convert that numeric to a string, and then
Python will choke when it tries to use a %d formatter and is given a
string value.
All of your and MRAB's comments were very helpful. However, I don't see how
these two problems are addressed:
sql = 'select * from options%s where ID=%%s', (opTable[0].upper() +
opTable[1:])
# cursor.execute(sql, id)
cursor.execute('select * from options%s where ID=%s' %
(opTable[0].upper() + opTable[1:], id))
The last one works, but if I comment it out and uncomment the middle line,
it doesn't. Same here:
sql = update options%s set PriceDiff='%%s' where Field='%%s' and
ID=%%s and Store='%%s' % (opTable[0].upper() + opTable[1:])
#cursor.execute(sql, (value, opName, id, store))
cursor.execute('update options%s set PriceDiff=%s where Field=%s
and ID=%s and Store=%s' % (opTable[0].upper() + opTable[1:], value,
opName, id, store))
TIA,
beno
--
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Re: multiprocessing and accessing server's stdout
On Thu, 2010-05-27 at 08:36 -0700, Tim Arnold wrote:
On May 26, 4:52 pm, Adam Tauno Williams awill...@whitemice.org
wrote:
On Wed, 2010-05-26 at 11:47 -0700, Tim Arnold wrote:
Hi,
I'm using multiprocessing's BaseManager to create a server on one
machine and a client on another. The client fires a request and the
server does some work, the result of which ends up on a shared file
system that both the client and server can see.
However, I need the client machine to see the stdout of the process
running on the server. Not sure this is doable--I've been unable to
google anything useful on this one.
Nope, it isn't. Don't use stdout, use an IPC mechanism to communicate
between the client and the server if you need feedback.
Thanks for that info, it saves me some time. This is a new area for me
though: do you redirect stdout on the server to a socket and have the
client listen and somehow pipe the sockets contents to the client
stdout?
No, I close stdin, stderr, and stdout on the server processes and attach
them to /dev/null. Just don't use stdout.
Interestingly, the RPYc package manages it--that is, the client gets
the stdout of the server process, so I'll dig into that code to get an
idea. In the meantime, are there any recipes or other docs that would
be helpful? I've been googling but without much luck.
Closing stdout and attaching it to any other file descriptor is pretty
simple.
sys.stdout = open('/dev/null', 'w')
You should be able to point it any any file-like object. But, again,
why?
If you have the data in the process why send it to stdout and redirect
it. Why not just send the data to the client directly?
--
Adam Tauno Williams awill...@whitemice.org LPIC-1, Novell CLA
http://www.whitemiceconsulting.com
OpenGroupware, Cyrus IMAPd, Postfix, OpenLDAP, Samba
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Re: Sockets and xml problem
kak...@gmail.com, 28.05.2010 13:50: Hi in the following code class MyClientHandler(SocketServer.BaseRequestHandler): def handle(self): print self.client_address, now( ) time.sleep(5) while True: xmltxt = self.request.recv(1024)--is this ok - enough? Depends. If your messages are never larger than 1K, this is enough. Otherwise, you have to collect the data, instead of parsing each chunk separately. I suggest using the incremental parser in xml.etree.ElementTree, which allows you to push more data into the parser as it comes in. When done, call it's .close() method to retrieve the result. http://docs.python.org/library/xml.etree.elementtree.html#xmltreebuilder-objects I want to send XML messages from my client. The server sends back the XML it receives but the parser exits with error codes. You should also rethink your approach one more time. Are you sure that a raw socket is a good protocol for sending your messages? In many cases, a proper higher-level transport protocol like HTTP is much better suited. If you provide more details about what you are trying to do, others may be able to help you further. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Sockets and xml problem
On May 28, 3:23 pm, Stefan Behnel stefan...@behnel.de wrote: kak...@gmail.com, 28.05.2010 13:50: Hi in the following code class MyClientHandler(SocketServer.BaseRequestHandler): def handle(self): print self.client_address, now( ) time.sleep(5) while True: xmltxt = self.request.recv(1024)--is this ok - enough? Depends. If your messages are never larger than 1K, this is enough. Otherwise, you have to collect the data, instead of parsing each chunk separately. I suggest using the incremental parser in xml.etree.ElementTree, which allows you to push more data into the parser as it comes in. When done, call it's .close() method to retrieve the result. http://docs.python.org/library/xml.etree.elementtree.html#xmltreebuil... I want to send XML messages from my client. The server sends back the XML it receives but the parser exits with error codes. You should also rethink your approach one more time. Are you sure that a raw socket is a good protocol for sending your messages? In many cases, a proper higher-level transport protocol like HTTP is much better suited. If you provide more details about what you are trying to do, others may be able to help you further. Stefan Stefan first of all thank you for your response. I don't want anything fancy. Just a simple server that accepts xml messages from multple clients in xml, parses the XML and show it in a console. Antonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Some More MySQL
On Fri, May 28, 2010 at 5:46 PM, Victor Subervi victorsube...@gmail.com wrote:
On Fri, May 28, 2010 at 2:17 AM, Dennis Lee Bieber wlfr...@ix.netcom.com
wrote:
On Thu, 27 May 2010 23:22:24 +0100, MRAB pyt...@mrabarnett.plus.com
declaimed the following in gmane.comp.python.general:
Placeholders which are handled by .execute shouldn't be wrapped in
quotes, even is the value is a string, because .execute will handle that
(and any other details) itself.
Even more internal details -- the MySQLdb placeholder is %s because
the adapter, internally, converts ALL parameters to strings, applies
escapes to them, and THEN wraps them with quotes before using Python
string interpolation to make the query that gets submitted to the
server.
This is why you can not use, say %d as a placeholder for a numeric
parameter... MySQLdb will convert that numeric to a string, and then
Python will choke when it tries to use a %d formatter and is given a
string value.
All of your and MRAB's comments were very helpful. However, I don't see how
these two problems are addressed:
sql = 'select * from options%s where ID=%%s', (opTable[0].upper() +
opTable[1:])
# cursor.execute(sql, id)
cursor.execute('select * from options%s where ID=%s' %
(opTable[0].upper() + opTable[1:], id))
The second argument to cursor.execute needs to be a tuple. Change the
call to this:
cursor.execute(sql, (id,))
The last one works, but if I comment it out and uncomment the middle line,
it doesn't. Same here:
sql = update options%s set PriceDiff='%%s' where Field='%%s' and
ID=%%s and Store='%%s' % (opTable[0].upper() + opTable[1:])
# cursor.execute(sql, (value, opName, id, store))
cursor.execute('update options%s set PriceDiff=%s where Field=%s
and ID=%s and Store=%s' % (opTable[0].upper() + opTable[1:], value,
opName, id, store))
Lose the quotes around the %s. You are replying to a post that
describes why this is important.
--
regards,
kushal
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Re: Free chapter about Python and databases (MySQL and SQLite)
Hi, Am 28.05.2010 04:45, schrieb Sebastian Bassi: Hello, I want to announce that the publisher of Python for Bioinformatis (CRC Press) allowed me to publish a chapter from my book. I decided to publish the chapter about Python and databases. I think it may be useful for somebody. The official announcement and download link is here: http://py4bio.com/2010/05/28/python_databases_mysql_sqlite/ For more information about the book: www.tinyurl.com/biopython Best, SB. This is nice! Congrats! Did you consider adding a part dealing with postgresql too? (Especially interesting in the way you can write stored functions in python there) Regards Tino smime.p7s Description: S/MIME Cryptographic Signature -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing and accessing server's stdout
On 05/28/10 13:17, Adam Tauno Williams wrote: cut You should be able to point it any any file-like object. But, again, why? If you have the data in the process why send it to stdout and redirect it. Why not just send the data to the client directly? Well you might want to multiplex it to more then one client, not saying that this is the case here, just something I imagine possible. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: Minor annoyances with properties
On May 28, 11:50 am, Christian Heimes li...@cheimes.de wrote: Am 28.05.2010 11:31, schrieb eb303: On May 27, 3:24 pm, Christian Heimes li...@cheimes.de wrote: Do I miss something? Is this the way to do it, or is there a better one? A better way was introduced in Python 2.6. Seehttp://docs.python.org/library/functions.html?highlight=property#prop... I have a Python only version around if you are still using Python 2.5. Christian Mmmm, I might still miss something. OK, I can replace my initial property using @property and @p.setter, but it doesn't seem to work in subclasses: class A(object): @property def p(self): return self._p @p.setter def _set_p(self, p): self._p = p class B(A): @p.setter def _set_p(self, p): … results in: Traceback (most recent call last): File toto.py, line 8, in module class B(A): File toto.py, line 9, in B @p.setter NameError: name 'p' is not defined It doesn't work because p is not in the scope of B's body while B is created. You have to write class B(A): # access the p property from class A @A.p.setter def p(self, p): pass # once p is in the class body scope, you must not use A.p again @p.deleter def p(self): pass Christian Well, I still have to explicitely specify the superclass's name then, so IMHO it's not a big improvement over repeating: p = property(A._get_p, _set_p) Thanks anyway… - Eric - -- http://mail.python.org/mailman/listinfo/python-list
Re: Free chapter about Python and databases (MySQL and SQLite)
On Fri, May 28, 2010 at 9:41 AM, Tino Wildenhain t...@wildenhain.de wrote: Did you consider adding a part dealing with postgresql too? (Especially interesting in the way you can write stored functions in python there) That is a good idea for the next version/edition. But meanwhile I could write something in my blog at www.py4bio.com Best, SB -- http://mail.python.org/mailman/listinfo/python-list
Re: http post
On 28 Mai, 16:47, yqyq22 yqy...@hotmail.com wrote: Hy, i would like to create a little script to reproduce this one below: Do you have suggestion? POST /folder/path/upload.exe?/dir HTTP/1.1 Host: 192.168.100.1:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: 1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/ *;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Proxy-Connection: keep-alive Referer:http://192.168.1.100:8080/dir1 Content-Type: multipart/form-data; boundary=---7075104567331 Content-Length: 539 Connection: close -7075104567331 Content-Disposition: form-data; name=F1; filename=file.txt Content-Type: application/octet-stream -7075104567331 Content-Disposition: form-data; name=p4 -7075104567331-- THANKS A LOT Just send it via a socket? Or use urllib, afair you can send custom HTTP headers. -- http://mail.python.org/mailman/listinfo/python-list
Re: http post
On May 28, 5:17 pm, christian schulze xcr...@googlemail.com wrote: On 28 Mai, 16:47, yqyq22 yqy...@hotmail.com wrote: Hy, i would like to create a little script to reproduce this one below: Do you have suggestion? POST /folder/path/upload.exe?/dir HTTP/1.1 Host: 192.168.100.1:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: 1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/ *;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Proxy-Connection: keep-alive Referer:http://192.168.1.100:8080/dir1 Content-Type: multipart/form-data; boundary=---7075104567331 Content-Length: 539 Connection: close -7075104567331 Content-Disposition: form-data; name=F1; filename=file.txt Content-Type: application/octet-stream -7075104567331 Content-Disposition: form-data; name=p4 -7075104567331-- THANKS A LOT Just send it via a socket? Or use urllib, afair you can send custom HTTP headers.- Hide quoted text - - Show quoted text - If i understood right i would use only socket.. is it possible? thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Free chapter about Python and databases (MySQL and SQLite)
On 28 Mai, 17:12, Sebastian Bassi sba...@clubdelarazon.org wrote: On Fri, May 28, 2010 at 9:41 AM, Tino Wildenhain t...@wildenhain.de wrote: Did you consider adding a part dealing with postgresql too? (Especially interesting in the way you can write stored functions in python there) That is a good idea for the next version/edition. But meanwhile I could write something in my blog atwww.py4bio.com Best, SB Indeed a style like user=root is not that nice. I had no look at the chapter but recommend you to read the PEP 8 - Python style guides (code conventions for python). Imo a book have to be kinda exemplary. And bad style sucks anyway ... PS: user = 'root' or user = root ... would be much more beautyful. -- http://mail.python.org/mailman/listinfo/python-list
Omit the headers from XML message
Hi i have the following xml message i want to omit the headers, any hints? POST /test/pcp/Listener HTTP/1.1 User-Agent: Jakarta Commons-HttpClient/3.1 Host: 127.0.0.1:50002 Content-Length: 547 pt_control_message xmlns=http://demo.com/demo; cmdReply sessionList session idscvdcvsdv/id subscriberIdsdfv/subscriberId subscriberNameAntonis Kaklis/subscriberName presenceaway/presence notetesting the new client/note ipAddressjlkdjf/ipAddress deviceClassandroid/deviceClass /session /sessionList /cmdReply /pt_control_message -- http://mail.python.org/mailman/listinfo/python-list
Re: http post
On 28 Mai, 17:20, yqyq22 yqy...@hotmail.com wrote: On May 28, 5:17 pm, christian schulze xcr...@googlemail.com wrote: On 28 Mai, 16:47, yqyq22 yqy...@hotmail.com wrote: Hy, i would like to create a little script to reproduce this one below: Do you have suggestion? POST /folder/path/upload.exe?/dir HTTP/1.1 Host: 192.168.100.1:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: 1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/ *;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Proxy-Connection: keep-alive Referer:http://192.168.1.100:8080/dir1 Content-Type: multipart/form-data; boundary=---7075104567331 Content-Length: 539 Connection: close -7075104567331 Content-Disposition: form-data; name=F1; filename=file.txt Content-Type: application/octet-stream -7075104567331 Content-Disposition: form-data; name=p4 -7075104567331-- THANKS A LOT Just send it via a socket? Or use urllib, afair you can send custom HTTP headers.- Hide quoted text - - Show quoted text - If i understood right i would use only socket.. is it possible? thanks Yeah i think so, but i am not quite sure. Just test it :) -- http://mail.python.org/mailman/listinfo/python-list
Re: http post
On May 28, 5:24 pm, christian schulze xcr...@googlemail.com wrote: On 28 Mai, 17:20, yqyq22 yqy...@hotmail.com wrote: On May 28, 5:17 pm, christian schulze xcr...@googlemail.com wrote: On 28 Mai, 16:47, yqyq22 yqy...@hotmail.com wrote: Hy, i would like to create a little script to reproduce this one below: Do you have suggestion? POST /folder/path/upload.exe?/dir HTTP/1.1 Host: 192.168.100.1:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: 1.9.2.3) Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/ *;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Proxy-Connection: keep-alive Referer:http://192.168.1.100:8080/dir1 Content-Type: multipart/form-data; boundary=---7075104567331 Content-Length: 539 Connection: close -7075104567331 Content-Disposition: form-data; name=F1; filename=file.txt Content-Type: application/octet-stream -7075104567331 Content-Disposition: form-data; name=p4 -7075104567331-- THANKS A LOT Just send it via a socket? Or use urllib, afair you can send custom HTTP headers.- Hide quoted text - - Show quoted text - If i understood right i would use only socket.. is it possible? thanks Yeah i think so, but i am not quite sure. Just test it :)- Hide quoted text - - Show quoted text - Do u have an example/link closed to my need? thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Some More MySQL
I still have this code:
sql = 'select * from options%s where ID=%%s', (opTable[0].upper() +
opTable[1:])
cursor.execute(sql, (id,))
which throws this error:
/var/www/html/angrynates.com/cart/enterOptionsPrices2.py
70 print 'All options prices have been successfully updated.'
71 print '/body\n/html'
72
73 enterOptionsPrices2()
74
enterOptionsPrices2 = function enterOptionsPrices2
/var/www/html/angrynates.com/cart/enterOptionsPrices2.py in
enterOptionsPrices2()
58 id = form.getfirst('%sID' % option)
59 sql = 'select * from options%s where ID=%%s',
(opTable[0].upper() + opTable[1:])
60 cursor.execute(sql, (id,))
61 # cursor.execute('select * from options%s where ID=%s' %
(opTable[0].upper() + opTable[1:], id))
62 if cursor.fetchone() is not None:
cursor = MySQLdb.cursors.Cursor object, cursor.execute = bound method
Cursor.execute of MySQLdb.cursors.Cursor object, sql = ('select * from
options%s where ID=%%s', 'Sizes'), id = '0.00'
/usr/lib64/python2.4/site-packages/MySQLdb/cursors.py in
execute(self=MySQLdb.cursors.Cursor object, query=('select * from
options%s where ID=%%s', 'Sizes'), args=('0.00',))
144 db = self._get_db()
145 charset = db.character_set_name()
146 query = query.encode(charset)
147 if args is not None:
148 query = query % db.literal(args)
query = ('select * from options%s where ID=%%s', 'Sizes'), query.encode
undefined, charset = 'latin1'
AttributeError: 'tuple' object has no attribute 'encode'
args = ('tuple' object has no attribute 'encode',)
Please advise.
TIA
beno
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Re: Yet Another MySQL Problem
Tim, The underscore is a valid variable-name, idiomatically used for I don't care about this, often seen in places like tuple assignment: The underscore is also used as an alias for gettext.gettext or gettext.ugettext so you may want to use another variable-name. Malcolm -- http://mail.python.org/mailman/listinfo/python-list
Re: Omit the headers from XML message
On 28 May, 16:24, kak...@gmail.com kak...@gmail.com wrote:
Hi i have the following xml message i want to omit the headers, any
hints?
POST /test/pcp/Listener HTTP/1.1
User-Agent: Jakarta Commons-HttpClient/3.1
Host: 127.0.0.1:50002
Content-Length: 547
pt_control_message xmlns=http://demo.com/demo;
cmdReply
sessionList
session
idscvdcvsdv/id
subscriberIdsdfv/subscriberId
subscriberNameAntonis Kaklis/subscriberName
presenceaway/presence
notetesting the new client/note
ipAddressjlkdjf/ipAddress
deviceClassandroid/deviceClass
/session
/sessionList
/cmdReply
/pt_control_message
Assuming the header is separated by a blank line, something like:
list(islice(dropwhile(bool, s.split('\n')), 1, None))
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Re: Free chapter about Python and databases (MySQL and SQLite)
christian schulze wrote: On 28 Mai, 17:12, Sebastian Bassi sba...@clubdelarazon.org wrote: On Fri, May 28, 2010 at 9:41 AM, Tino Wildenhain t...@wildenhain.de wrote: Did you consider adding a part dealing with postgresql too? (Especially interesting in the way you can write stored functions in python there) That is a good idea for the next version/edition. But meanwhile I could write something in my blog atwww.py4bio.com Best, SB Indeed a style like user=root is not that nice. I had no look at the chapter but recommend you to read the PEP 8 - Python style guides (code conventions for python). Imo a book have to be kinda exemplary. And bad style sucks anyway ... PS: user = 'root' or user = root ... would be much more beautyful. My crystal ball says that the post you are not quoting is concerned about the security implications of accessing a database as the superuser rather than about spaces surrounding the assignment operator. My crystal ball then starts nitpicking and adds that in the sample chapter user=root occurs within an argument list where its format is actually required by the PEP: - Don't use spaces around the '=' sign when used to indicate a keyword argument or a default parameter value. Yes: def complex(real, imag=0.0): return magic(r=real, i=imag) Cheers, Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Some More MySQL
Victor Subervi wrote:
I still have this code:
sql = 'select * from options%s where ID=%%s', (opTable[0].upper()
+ opTable[1:])
cursor.execute(sql, (id,))
which throws this error:
/var/www/html/angrynates.com/cart/enterOptionsPrices2.py
http://angrynates.com/cart/enterOptionsPrices2.py
70 print 'All options prices have been successfully updated.'
71 print '/body\n/html'
72
73 enterOptionsPrices2()
74
enterOptionsPrices2 = function enterOptionsPrices2
/var/www/html/angrynates.com/cart/enterOptionsPrices2.py
http://angrynates.com/cart/enterOptionsPrices2.py in enterOptionsPrices2()
58 id = form.getfirst('%sID' % option)
59 sql = 'select * from options%s where ID=%%s',
(opTable[0].upper() + opTable[1:])
60 cursor.execute(sql, (id,))
61 # cursor.execute('select * from options%s where ID=%s' %
(opTable[0].upper() + opTable[1:], id))
62 if cursor.fetchone() is not None:
cursor = MySQLdb.cursors.Cursor object, cursor.execute = bound method
Cursor.execute of MySQLdb.cursors.Cursor object, sql = ('select *
from options%s where ID=%%s', 'Sizes'), id = '0.00'
/usr/lib64/python2.4/site-packages/MySQLdb/cursors.py in
execute(self=MySQLdb.cursors.Cursor object, query=('select * from
options%s where ID=%%s', 'Sizes'), args=('0.00',))
144 db = self._get_db()
145 charset = db.character_set_name()
146 query = query.encode(charset)
147 if args is not None:
148 query = query % db.literal(args)
query = ('select * from options%s where ID=%%s', 'Sizes'), query.encode
undefined, charset = 'latin1'
AttributeError: 'tuple' object has no attribute 'encode'
args = ('tuple' object has no attribute 'encode',)
Please advise.
On line 59 you're making a tuple.
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Re: Omit the headers from XML message
On 28 Μάϊος, 18:45, Jon Clements jon...@googlemail.com wrote:
On 28 May, 16:24, kak...@gmail.com kak...@gmail.com wrote:
Hi i have the following xml message i want to omit the headers, any
hints?
POST /test/pcp/Listener HTTP/1.1
User-Agent: Jakarta Commons-HttpClient/3.1
Host: 127.0.0.1:50002
Content-Length: 547
pt_control_message xmlns=http://demo.com/demo;
cmdReply
sessionList
session
idscvdcvsdv/id
subscriberIdsdfv/subscriberId
subscriberNameAntonis Kaklis/subscriberName
presenceaway/presence
notetesting the new client/note
ipAddressjlkdjf/ipAddress
deviceClassandroid/deviceClass
/session
/sessionList
/cmdReply
/pt_control_message
Assuming the header is separated by a blank line, something like:
list(islice(dropwhile(bool, s.split('\n')), 1, None))
Thank you!!!
Antonis
--
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Re: Omit the headers from XML message
kak...@gmail.com, 28.05.2010 17:24: Hi i have the following xml message i want to omit the headers, any hints? POST /test/pcp/Listener HTTP/1.1 User-Agent: Jakarta Commons-HttpClient/3.1 Host: 127.0.0.1:50002 Content-Length: 547 pt_control_message xmlns=http://demo.com/demo; cmdReply sessionList session idscvdcvsdv/id subscriberIdsdfv/subscriberId subscriberNameAntonis Kaklis/subscriberName presenceaway/presence notetesting the new client/note ipAddressjlkdjf/ipAddress deviceClassandroid/deviceClass /session /sessionList /cmdReply /pt_control_message Use the HTTP server that comes with Python, instead of the plain socket server. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Omit the headers from XML message
Jon Clements wrote:
On 28 May, 16:24, kak...@gmail.com kak...@gmail.com wrote:
Hi i have the following xml message i want to omit the headers, any
hints?
Assuming the header is separated by a blank line, something like:
list(islice(dropwhile(bool, s.split('\n')), 1, None))
Making the same assumptions, but giving a single string instead of a list of
lines:
s.partition(\n\n)[-1]
Peter
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Re: ElementTree write creates large one line XML file ....
Thanks Robert Kern : prettyprint ; indent() does the trick ;-) ElementTree writes exactly what you tell it to. In XML, whitespace is significant. If you want newlines and/or indentation to make it pretty-looking, then you need to add those to your elements. Fredrik provides an example function for doing this: http://effbot.org/zone/element-lib.htm#prettyprint -- http://mail.python.org/mailman/listinfo/python-list
Like __getattr__ but with args and kwargs as well
I know, the title doesn't say much, but I had no better ideas. =) I have a class within a serie of redundant methods, which looks like this: class MixedAuthorizer: def __init__(self, *args): # expected a list of class instances self.authorizers = args def get_home(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_home(user) return def get_password(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_password(user) return # follows a long list of get_* methods as above ... Considering that I always do the same thing (iterate over a list of objects - call obj.has_user() - call obj.get_*()) I would like to know if there's a more compact way to do that. What I basically need is something like __getattr__ but which provides the arguments and eventually the keyword arguments a method has been called with, other than just its name. Actually I'm not even sure whether Python can reach such a level of dynamism but I wanted to give it a try anyway. Is there a way to do such a thing? --- Giampaolo http://code.google.com/p/pyftpdlib http://code.google.com/p/psutil -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
class MixedAuthorizer: def __init__(self, *args): # expected a list of class instances self.authorizers = args self._set_methods() def _set_methods(self): for attr in (home, password): def fn(user): return self._get_attr(user, attr) setattr(self, get_%s % attr, fn) def _get_attr(self, user, attr): auths = [auth for auth in self.authorizers if auth.has_user(user)] if not auths: return method_name = get_%s % attr method = getattr(auths[0], method_name, None) if not fn: raise ValueError(Unknown attribute - %s % method_name) return fn(user) HTH, -- Miki http://pythonwise.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
On Fri, May 28, 2010 at 10:08 AM, Giampaolo Rodolà g.rod...@gmail.com wrote: I know, the title doesn't say much, but I had no better ideas. =) I have a class within a serie of redundant methods, which looks like this: class MixedAuthorizer: def __init__(self, *args): # expected a list of class instances self.authorizers = args def get_home(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_home(user) return def get_password(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_password(user) return # follows a long list of get_* methods as above ... Considering that I always do the same thing (iterate over a list of objects - call obj.has_user() - call obj.get_*()) I would like to know if there's a more compact way to do that. What I basically need is something like __getattr__ but which provides the arguments and eventually the keyword arguments a method has been called with, other than just its name. Actually I'm not even sure whether Python can reach such a level of dynamism but I wanted to give it a try anyway. Is there a way to do such a thing? There's no such über-__getattr__, but with some indirection we can achieve much the same effect: #Note: Completely untested from functools import partial class Whatever(object): def _getter(self, _name, user, *args, **kwds): # I assume your actual code will use the *args and **kwds for auth in self.authorizers: if not auth.has_user(user): continue return getattr(auth, _name)(user) return def __getattr__(self, name): if name.startswith(get_): return partial(self._getter, _name=name) else: raise AttributeError Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
method = getattr(auths[0], method_name, None) Should be fn = getattr(auths[0], method_name, None) -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
Giampaolo Rodolà wrote: I know, the title doesn't say much, but I had no better ideas. =) I have a class within a serie of redundant methods, which looks like this: class MixedAuthorizer: def __init__(self, *args): # expected a list of class instances self.authorizers = args def get_home(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_home(user) return def get_password(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_password(user) return # follows a long list of get_* methods as above ... Considering that I always do the same thing (iterate over a list of objects - call obj.has_user() - call obj.get_*()) I would like to know if there's a more compact way to do that. What I basically need is something like __getattr__ but which provides the arguments and eventually the keyword arguments a method has been called with, other than just its name. Actually I'm not even sure whether Python can reach such a level of dynamism but I wanted to give it a try anyway. Is there a way to do such a thing? Yes, and for the above example it is easier to implement than you think: class MA(object): def __init__(self, authorizers): self.authorizers = authorizers def __getattr__(self, name): def get(self, user): for auth in self.authorizers: if auth.has_user(user): return getattr(auth, name)(user) return get.__get__(self) You can modify it to pass along arbitrary keyword arguments: class MA(object): def __init__(self, authorizers): self.authorizers = authorizers def __getattr__(self, name): def get(self, **kw): for auth in self.authorizers: if auth.has_user(kw[user]): return getattr(auth, name)(**kw) return get.__get__(self) Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: if, continuation and indentation
On 28-May-10 05:54 AM, Jonathan Hartley wrote: On May 27, 1:57 pm, Jean-Michel Pichavantjeanmic...@sequans.com wrote: HH wrote: I have a question about best practices when it comes to line wrapping/ continuation and indentation, specifically in the case of an if statement. When I write an if statement with many conditions, I prefer to use a parenthesis around the whole block and get the implicit continuation, rather than ending each line with an escape character. Thus, using the example from the style guide (http://www.python.org/dev/peps/ pep-0008/) I would write: if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100): raise ValueError(sorry, you lose) The problem should be obvious -- it's not easy to see where the conditional ends and the statement begins since they have the same indentation. Part of the problem, I suppose, is that Emacs indents 'height' and the other lines in the conditional to 4 spaces (because of the parenthesis). How do people deal with this situation? Thanks, Henrik One possible solution if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) JM I've always liked this, or even: if ( width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100 ): raise ValueError(sorry, you lose) but my co-workers have uniformly gone bananas whenever I try it. I liked: On 27-May-10 08:48 AM, Xavier Ho wrote: On 27 May 2010 22:22, HH henri...@gmail.com mailto:henri...@gmail.com wrote: if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight 100): raise ValueError(sorry, you lose) I've gotta say - I've bumped into this problem before, and I'm sure many other have - this is a valid question. It just hasn't bothered me enough to ask... Correct me if I'm wrong, but I think the following is equivalent, and looks better. Although this won't fix all ugly cases in that problem.. if (width, height, color, emphasis) == (0, 0, 'red', 'strong') or highlight 100: raise ValueError(sorry, you lose) Cheers, Xav but nobody commented. Colin W. -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
2010/5/28 Peter Otten __pete...@web.de: Giampaolo Rodolà wrote: I know, the title doesn't say much, but I had no better ideas. =) I have a class within a serie of redundant methods, which looks like this: class MixedAuthorizer: def __init__(self, *args): # expected a list of class instances self.authorizers = args def get_home(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_home(user) return def get_password(self, user): for auth in self.authorizers: if not auth.has_user(user): continue return auth.get_password(user) return # follows a long list of get_* methods as above ... Considering that I always do the same thing (iterate over a list of objects - call obj.has_user() - call obj.get_*()) I would like to know if there's a more compact way to do that. What I basically need is something like __getattr__ but which provides the arguments and eventually the keyword arguments a method has been called with, other than just its name. Actually I'm not even sure whether Python can reach such a level of dynamism but I wanted to give it a try anyway. Is there a way to do such a thing? Yes, and for the above example it is easier to implement than you think: class MA(object): def __init__(self, authorizers): self.authorizers = authorizers def __getattr__(self, name): def get(self, user): for auth in self.authorizers: if auth.has_user(user): return getattr(auth, name)(user) return get.__get__(self) You can modify it to pass along arbitrary keyword arguments: class MA(object): def __init__(self, authorizers): self.authorizers = authorizers def __getattr__(self, name): def get(self, **kw): for auth in self.authorizers: if auth.has_user(kw[user]): return getattr(auth, name)(**kw) return get.__get__(self) Peter -- http://mail.python.org/mailman/listinfo/python-list Thanks, this has been helpful. I managed to write this monster: =) class MixedAuthorizer(object): def __init__(self, *authorizers): self.authorizers = authorizers def __getattr__(self, name): def get(self, user, *args, **kwargs): for auth in self.authorizers: if auth.has_user(user): method = getattr(auth, name) return method(user, *args, **kwargs) # if we reached this point no user was found if name == validate_authentication: return False if name.startswith(get): return if name.startswith(has): return False return get.__get__(self) --- Giampaolo http://code.google.com/p/pyftpdlib http://code.google.com/p/psutil -- http://mail.python.org/mailman/listinfo/python-list
Re: Like __getattr__ but with args and kwargs as well
Giampaolo Rodolà wrote:
I know, the title doesn't say much, but I had no better ideas. =)
I have a class within a serie of redundant methods, which looks like this:
class MixedAuthorizer:
def __init__(self, *args):
# expected a list of class instances
self.authorizers = args
def get_home(self, user):
for auth in self.authorizers:
if not auth.has_user(user):
continue
return auth.get_home(user)
return
def get_password(self, user):
for auth in self.authorizers:
if not auth.has_user(user):
continue
return auth.get_password(user)
return
# follows a long list of get_* methods as above
...
Considering that I always do the same thing (iterate over a list of
objects - call obj.has_user() - call obj.get_*()) I would like to
know if there's a more compact way to do that.
What I basically need is something like __getattr__ but which provides
the arguments and eventually the keyword arguments a method has been
called with, other than just its name.
Actually I'm not even sure whether Python can reach such a level of
dynamism but I wanted to give it a try anyway.
Is there a way to do such a thing?
Here's a way (mis)using a decorator (written in Python 3):
def locate(func):
def lookup(self, user):
for auth in self.authorizers:
if auth.has_user(user):
return getattr(auth, func.__name__)()
return
return lookup
class Authorizer:
def __init__(self, user):
self.user = user
def has_user(self, user):
return self.user == user
def get_home(self):
return {}-HOME.format(self.user)
def get_password(self):
return {}-PASSWORD.format(self.user)
class MixedAuthorizer:
def __init__(self, *authorizers):
self.authorizers = authorizers
# The following methods are used only as placeholders.
@locate
def get_home(self): pass
@locate
def get_password(self): pass
a1 = Authorizer(USER1)
a2 = Authorizer(USER2)
m = MixedAuthorizer(a1, a2)
print(m.get_home(USER1))
print(m.get_password(USER2))
--
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Re: Omit the headers from XML message
On May 28, 7:48 pm, Peter Otten __pete...@web.de wrote:
Jon Clements wrote:
On 28 May, 16:24, kak...@gmail.com kak...@gmail.com wrote:
Hi i have the following xml message i want to omit the headers, any
hints?
Assuming the header is separated by a blank line, something like:
list(islice(dropwhile(bool, s.split('\n')), 1, None))
Making the same assumptions, but giving a single string instead of a list of
lines:
s.partition(\n\n)[-1]
Peter
Thank you all for your responses!
Antonis
--
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Re: multiprocessing and accessing server's stdout
On Fri, 2010-05-28 at 15:41 +0100, Martin P. Hellwig wrote: On 05/28/10 13:17, Adam Tauno Williams wrote: cut You should be able to point it any any file-like object. But, again, why? If you have the data in the process why send it to stdout and redirect it. Why not just send the data to the client directly? Well you might want to multiplex it to more then one client, not saying that this is the case here, just something I imagine possible. That still doesn't make sense. Why 'multiplex stdout'? Why not just multiplex the data into proper IPC channels in the first place? -- Adam Tauno Williams awill...@whitemice.org LPIC-1, Novell CLA http://www.whitemiceconsulting.com OpenGroupware, Cyrus IMAPd, Postfix, OpenLDAP, Samba -- http://mail.python.org/mailman/listinfo/python-list
A Friday Python Programming Pearl: random sampling
For a lazy Friday evening, here's a Python algorithm that seemed so
cute that I just had to share it with everyone. I'm sure it's well
known to many here, but it was new to me. Skip directly to the
'sample2' function to see the algorithm and avoid the commentary...
Suppose that you want to select a number of elements, k, say, from a
population, without replacement. E.g., selecting 3 elements from
range(30) might give you:
[13, 3, 27]
Order matters, so the above is considered distinct from [3, 13, 27].
And you want to be sure that each possible selection has equal
probability of occurring (to within the limits of the underlying
PRNG).
One solution is to select elements from the population one-by-one,
keep track of the indices of already-selected elements in a set, and
if you end up selecting something that's already in your set, simply
try again. Something like this (code stolen and adapted from
Random.sample in Python's standard library 'random' module):
from random import randrange
def sample1(population, k):
n = len(population)
result = [None] * k
selected = set()
for i in range(k):
j = randrange(n)
# retry until we get something that's not already selected
while j in selected:
j = randrange(n)
selected.add(j)
result[i] = population[j]
return result
N.B. The above is Python 3 code; for Python 2, replace range with
xrange.
All that's required of 'population' here is that it implements __len__
and __getitem__. The method works well for k significantly smaller
than n, but as k approaches n the number of reselections required
increases. So for larger k, Random.sample uses a different method:
roughly, make a copy of 'population', do a partial in-place shuffle of
that copy that randomizes the first k elements, and return those.
This second method isn't so great when k is small and n is huge, since
it ends up being O(n) from the list copy, but it works out that the
two methods complement each other nicely.
Looking at the above code, I was idly wondering whether there was a
way to alter 'sample1' to avoid the need for resampling, thus giving a
single algorithm that works reasonably efficiently regardless of the
population size and requested sample size. And it turns out that
there is. The code below is similar to 'sample1' above, except that
instead of using a set to keep track of indices of already-selected
members of the population, it uses a dict; for an index i
(corresponding to a member of the population), d[i] gives the position
that population[i] will occupy in the resulting sample.
from random import randrange
def sample2(population, k):
n = len(population)
d = {}
for i in reversed(range(k)):
j = randrange(i, n)
if j in d:
d[i] = d[j]
d[j] = i
result = [None] * k
for j, i in d.items():
result[i] = population[j]
return result
Note that no resampling is required, and that there's no copying of
the population list. The really clever bit is the 'if j in d: ...'
block. If you stare at the algorithm for long enough (and it does
take some staring), you can convince yourself that after the first
'for' loop, d can be any of the n*(n-1)*...*(n-k+1)
mappings-with-no-repeated-elements from some set of k elements of
range(n) to range(k), and that each one of these mappings is equally
likely to occur. In a sense, this d is the inverse of the desired
sample, which would be a map with no repetitions from range(k) to
range(n). So inverting d, and replacing d's keys by the corresponding
population elements, gives the random sample.
N.B. I don't claim any originality for the algorithm; only for the
implementation: the algorithm is based on an algorithm attributed to
Robert Floyd, and appearing in Jon Bentley's 'Programming Pearls' book
(though that algorithm produces a set, so doesn't worry about the
ordering of the sample). But I was struck by its beauty and
simplicity, and thought it deserved to be better known.
Happy Friday!
--
Mark
--
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Re: TypeError: _new_() takes exactly 3 arguments (2 given) - what does it mean?
On Wed, 26 May 2010 14:30:21 -0400 Terry Reedy tjre...@udel.edu wrote: On 5/24/2010 2:52 PM, Jesse McDonnell wrote: I'm attempting to install Powerline http://code.google.com/p/powerline/, a computer reservation software based on CherryPy/Python using a MYSql database, at my local library and I've run up against an error that I Honestly, unless you find a Python+Powerline expert who will help, I suggest that you delete Powerline and look for something else. The most recent release is an alpha release over 2 years old. Except for the Feb 2010 wiki updates, the project appears to be dead. Even if someone helped you past this, there is no evidence that the fix would applied back to the codebase. And what about the next bug or problem? Terry Jan Reedy and On Wed, 26 May 2010 12:04:53 -0700 (PDT) Carl Banks pavlovevide...@gmail.com wrote: [Again, can't see the original, sorry] On May 26, 11:30 am, Terry Reedy tjre...@udel.edu wrote: On 5/24/2010 2:52 PM, Jesse McDonnell wrote: The most common reason for this message is trying to subclass a module. (Very easy mistake when a module has the same name as a class, which is part of why I don't like the practice, though the modern PEP 8 reduces the issue.) IOW, someone did something like this: import foo class bar(foo): pass when they should have done this: from foo import foo class bar(foo): pass Terry and Carl, Thanks for your replies. I got a response from the guy who coded Powerline through the google group for the app and upgrading dbwrap resolved this particular error. He also helped me work through some python-genshi issues and I now have a working web interface. Thanks again for your help. Jesse -- http://mail.python.org/mailman/listinfo/python-list
Re: multiprocessing and accessing server's stdout
On 05/28/10 21:44, Adam Tauno Williams wrote: On Fri, 2010-05-28 at 15:41 +0100, Martin P. Hellwig wrote: On 05/28/10 13:17, Adam Tauno Williams wrote: cut You should be able to point it any any file-like object. But, again, why? If you have the data in the process why send it to stdout and redirect it. Why not just send the data to the client directly? Well you might want to multiplex it to more then one client, not saying that this is the case here, just something I imagine possible. That still doesn't make sense. Why 'multiplex stdout'? Why not just multiplex the data into proper IPC channels in the first place? I am going on a stretch here, I mostly agree with you, just trying to illustrate that there could be corner cases where this is sensible. The current situation could be that there is a client/server program (binary only perhaps) which is not multi-user safe. Python can be used as a wrapper around the server to make it multi-client, by emulating the exact behavior towards the client, the client program does not have to be changed. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: function that counts...
On 05/26/10 11:04, Bryan wrote: Jean-Michel Pichavant wrote: I still don't see how many positive integers less than n have digits that sum up to m makes it a partition though if that what prttn means. Surely because I miss the context. A partition of a positive integer m is an unordered collection of positive integers that sum to m. [1, 1, 2, 5] is a partition of 9. The problem at issue here is not that of counting partitions. My algorithm for our prttn separated out the 'ndsums' sub-problem: Count d-digit ints with digits summing to m. I found a generalization of that problem stated in the /CRC Handbook of Discrete and Combinatorial Mathematics/ (2000 edition, section 2.1) among counting problems as: Solutions to x_1 + ... x_n = k 0 = x_i = a_i for one or more i Alas, the handbook does not provide a formula or algorithm. It refers to the inclusion/exclusion principle, which I did not see how to turn into an efficient algorithm. superpollo posted this question in comp.programming (http://groups.google.com/group/comp.programming/browse_thread/thread/e3b10346db8ebd0a/579ca67f8b9b5a8c; http://groups.google.com/group/comp.programming/msg/f7323d6e6942e883; http://groups.google.com/group/comp.programming/browse_thread/thread/e3b10346db8ebd0a/dc4cd1e2feb89500 ) I went through the mathematical foundation of using partition/distribution and inclusion-exclusion, and have written some code that solves a subset of the problem, feel free if you or superpollo are interested in continuing my answer (I won't be able to continue it until next week, have been a little bit busy here) copying the code here for convenience: # memoization would be very useful here def fact(n): factorial function (i.e. n! = n * (n-1) * ... * 2 * 1) return n * fact(n - 1) if n != 0 else 1 def C(n, r): regular Combination (nCr) return fact(n) / (fact(n - r) * fact(r)) def D(M, N): Distribution aka Partitioning return C(M + N - 1, M) def partition10(M, i): Count how many integer N sums to M where N = 10**int(i) s = 0 sign = 1 for j in range(i + 1): s += sign * D(M, i) * C(i, j) # flip the sign for inclusion-exclusion sign *= -1 # if M = 32, then 32, 22, 12, 2, -8 M -= 10 return s # still need to write: # def partitionN10(...): -- applies a restriction/boundary to # the most significant digit # then make it recurse. # assuming factorials calculation is constant time (hint: memoization) # the resulting code should work in O(n**2) # an improvement over the naive method which is O(10**n) # where n is the number of digits in N # DISCLAIMER: the big-O is a quick guess, not really calculated -- http://mail.python.org/mailman/listinfo/python-list
Re: Free chapter about Python and databases (MySQL and SQLite)
Sebastian Bassi sba...@clubdelarazon.org writes: On Fri, May 28, 2010 at 12:37 AM, John Bokma j...@castleamber.com wrote: I feel more than uncomfortable with example code that uses: user=root What's wrong with this? It is just an example of connection string. The reader will use his/her user/pass/dbname according to their own settings. A bit down you're contradicting yourself: your audience is not familiar with databases, yet you assume that they will use their own settings? (e.g. p291). I never get why people write a short (IMO) /bad/ intro to databases while there are books out there that do a way better The intended audience of this book are biologist who may be not familiarized with relational databases. Most of my colleagues (at least from the bio camp) don't even know that behind most dynamic web pages there are databases and I think that most of them will find the intro section useful. You can always skip what you know and go to the point you want. My point is that the intro I (speed) read is weak at best. You say you're doing your audience a favor, but I don't agree. I am not sure that price in this kind of book are tied to the number of pages. There must be some relation, but this is not the main factor affecting price. Even if it's just a few bucks, it's still money saved [0]. On top of that I think it's way better to point your audience to good books on the topic and skip the intro instead of doing a (half hearted IMO) attempt at it yourself. I would love to see more technical books that start at page 1 with the topic, not with an introduction to the language (170+ pages) and some ... I see where you go, it seems you are not the target audience for this book. Anyway I appreciate your feedback. You're welcome. And to be honest, if the book didn't have those filler chapters (which they are IMO) I would certainly have been interested in it. Note that I am not trying to convince you to rewrite your book, but my bookcase could have 20% more room if technical writers stopped to write books that tried to introduce their audience to everything but the kitchen sink [1]. My favourite books are the ones that /don't/ do the everything but the kitchensink gig, but direct me to other high quality books. [0] I've been a technical editor for a book, and got paid by the page. [1] I mean the books that seem to handle a single specific topic. If I buy Ubuntu up and running I expect everything, including the kitchensink. -- John Bokma j3b Hacking Hiking in Mexico - http://johnbokma.com/ http://castleamber.com/ - Perl Python Development -- http://mail.python.org/mailman/listinfo/python-list
Re: Free chapter about Python and databases (MySQL and SQLite)
Mobile On May 28, 2010, at 10:05 PM, John Bokma j...@castleamber.com wrote: Sebastian Bassi sba...@clubdelarazon.org writes: On Fri, May 28, 2010 at 12:37 AM, John Bokma j...@castleamber.com wrote: Even if it's just a few bucks, it's still money saved [0]. On top of that I think it's way better to point your audience to good books on the topic and skip the intro instead of doing a (half hearted IMO) attempt at it yourself. OK, John. What book do you recommend? -- http://mail.python.org/mailman/listinfo/python-list
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[issue8825] int(0,0) throws exception
Mark Dickinson dicki...@gmail.com added the comment: Dino: I think Clark already did this: http://ironpython.codeplex.com/WorkItem/View.aspx?WorkItemId=27186 Sorry; I checked that there was an IronPython issue open before I closed this one, but forgot to mention it here. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8825 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: New submission from STINNER Victor victor.stin...@haypocalc.com: readbuffer_encode() and charbuffer_encode() are not really encoder nor related to encodings: they are related to PyBuffer. readbuffer_encode() uses s# format and charbuffer_encode() uses t# format to parse their arguments. Both functions were introduced by the creation of the _codecs module 10 years ago (r14660). I think that these functions should be removed. memoryview() should be used instead. Note: charbuffer_encode() is the last function using on of the t format (t, t#, t*) in Python3. Those two encoder functions were meant to be used by Python codec implementations which want to use the readbuffer and charbuffer interfaces available in Python via s# and t# to access input object data. They are not used by the builtin codecs, but may well be in use by 3rd party codecs. I'm not sure why you think those functions are not encoders. -- nosy: +lemburg title: Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() andcodecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8839] PyArg_ParseTuple(): remove t# format
Marc-Andre Lemburg m...@egenix.com added the comment:
STINNER Victor wrote:
New submission from STINNER Victor victor.stin...@haypocalc.com:
t# format was introduced by r11803 (11 years ago): Implement new format
character 't#'. This is like s#, accepting an object that implements the
buffer interface, but requires a buffer that contains 8-bit character data.
Python3 now has a strict separation between byte string (bytes and bytearray
types) and unicode string (str), and has PyBuffer and PyCapsule APIs. t#
format can be replaced by y# or y*.
Extract of getarg.c:
/*TEO: This can be eliminated --- here only for backward
compatibility */
case 't': { /* 8-bit character buffer, read-only access */
In Python, the last function using t# is _codecs.charbuffer_encode() and I
proposed to remove this function in #8838. We can also patch this function.
I don't know if third party modules use this format or not. I don't know if
it can be just removed or if it should raise a deprecation warning (but who
will notice such warning since there are disabled by default?).
Since Python3 completely removed the getcharbuffer interface
to which the t# interfaces in Python2, t# does indeed no
longer serve any special purpose.
It's probably wise to just map t# to y# in order to ease
porting extensions from 2.x to 3.x.
--
nosy: +lemburg
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[issue8839] PyArg_ParseTuple(): remove t# format
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: STINNER Victor victor.stin...@haypocalc.com added the comment: Patch to remove t#: - Update c-api/arg.rst documentation - Replace t# format by y# in codecs.charbuffer_encode() - Add a note in Doc/whatsnew/3.2.rst (in Porting to Python 3.2) Given that y# is not (yet) in wide-spread use, it may actually make more sense, to replace y# with t# and introduce t* to replace y*. y# and y* could then be setup as synonyms for t# and t*. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8839] PyArg_ParseTuple(): remove t# format
STINNER Victor victor.stin...@haypocalc.com added the comment: Given that y# is not (yet) in wide-spread use, ... t# is only used once (in codecs.charbuffer_encode()), whereas y# is used by ossaudiodev, socket and mmap modules (there are 8 functions using y#). There are 46 functions using y* format. y format is not used in Python3. To me, it looks easier to just drop t# and continue to use y, y* and y# formats in Python3. y# and y* could then be setup as synonyms for t# and t* If we have to keep backward compatibility, yes, t# can be kept as a synonym for y#. But I don't think that backward compatibility of the C API is important in Python3 because only few 3rd party modules are compatible with Python3. -- I prefer to use y, y* and y# formats because they target the *bytes* type (which is the Python3 type to store byte strings), whereas s# is used in Python2 to get text, *str* type.. which are byte strings, but most Python2 programmers consider that the str type is the type of chararacter string. I see the change of s# to y#, as the change from str to bytes (the strict separation between bytes and str). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
STINNER Victor victor.stin...@haypocalc.com added the comment: Those two encoder functions were meant to be used by Python codec implementations which want to use the readbuffer and charbuffer interfaces available in Python via s# and t# to access input object data. Ah ok. They are not used by the builtin codecs, but may well be in use by 3rd party codecs. My quick Google search didn't found any of those. I suppose that str and bytes are enough for most people. Do you know an usecase of text or bytes stored in different types than str and bytes? (I suppose the bytearray is compatible with bytes, and so it can be used instead of bytes) I'm not sure why you think those functions are not encoders. I consider that Python3 codecs module only encode and decode text to/from an encoding, whereas Python2 had extra unrelated codecs like base64 or hex (but it was decided to remove them to cleanup the codecs module). -- title: Remove codecs.readbuffer_encode() andcodecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8835] buildbot: support.transient_internet() doesn't catch DNS socket.gaierror
STINNER Victor victor.stin...@haypocalc.com added the comment: There is another error: test test_ssl failed -- Traceback (most recent call last): File /scratch/pybot-buildarea/trunk.klose-ubuntu-i386/build/Lib/test/test_ssl.py, line 261, in test_algorithms s.connect(remote) File /scratch/pybot-buildarea/trunk.klose-ubuntu-i386/build/Lib/ssl.py, line 292, in connect socket.connect(self, addr) File /scratch/pybot-buildarea/trunk.klose-ubuntu-i386/build/Lib/socket.py, line 222, in meth return getattr(self._sock,name)(*args) error: [Errno 110] Connection timed out transient_internet() should also catch socket.error(errno.ETIMEDOUT). -- See also #8455, #8499 and #8574. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8835 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8842] sqlite3 library outdated in Windows builds
New submission from Marko Kohtala marko.koht...@gmail.com: The Windows builds seem to come with SQLite library version 3.5.9, as seen from sqlite3.sqlite_version. This is from 2008-May-12. I've been using the sqlite3 module, but keep running into bugs on Windows. Replacing the DLLs\sqlite3.dll with a newer library (sqlite is going at version 3.6.23), seems to fix those problems. One problem was locking failures when performing a lot of changes and committing after each change. This happens within a single script accessing the file, apparently locking himself out. I did not want users needing to patch installed Python, so I got around that by removing the smaller commits and making one huge commit at end. Now I had a problem that ANALYZE does not result in good queries. Performing ANALYZE with newer library speeded queries significantly. I do not know how to get around that. On Linux I see Python 2.6 using sqlite 3.6.x versions, so I'd expect the reason for old library on Windows can not be incompatibility. -- components: Library (Lib), Windows messages: 106647 nosy: Marko.Kohtala priority: normal severity: normal status: open title: sqlite3 library outdated in Windows builds type: behavior versions: Python 2.6, Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8842 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8839] PyArg_ParseTuple(): remove t# format
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: STINNER Victor victor.stin...@haypocalc.com added the comment: Given that y# is not (yet) in wide-spread use, ... t# is only used once (in codecs.charbuffer_encode()), whereas y# is used by ossaudiodev, socket and mmap modules (there are 8 functions using y#). There are 46 functions using y* format. y format is not used in Python3. To me, it looks easier to just drop t# and continue to use y, y* and y# formats in Python3. You are forgetting our main target: to get extension writers to port their extensions to Python3. Changes to the Python core are a lot easier to implement than getting thousands of extensions ported. t# is in wide-spread use, since it's the only way a Python2 extension can request access to an object's text data version. y# was introduced with Python3, and there are only very few extensions written for it. Given these facts, it's better to drop y# and replace it with t#. This is easily done for the core modules and by adding synonyms for y# we can also automatically take care of the few Python3 extensions possibly using it. y# and y* could then be setup as synonyms for t# and t* If we have to keep backward compatibility, yes, t# can be kept as a synonym for y#. But I don't think that backward compatibility of the C API is important in Python3 because only few 3rd party modules are compatible with Python3. True and that's why we have to make it easier for extension writer to port their extensions rather than making it harder. It is not too difficult to adjust a Python2 extension to work in Python3 as well, so that's most likely the route that many extension writer will take, hence the need to reduce the number of differences between the Python2 and Python3 C API. -- I prefer to use y, y* and y# formats because they target the *bytes* type (which is the Python3 type to store byte strings), whereas s# is used in Python2 to get text, *str* type.. which are byte strings, but most Python2 programmers consider that the str type is the type of chararacter string. I see the change of s# to y#, as the change from str to bytes (the strict separation between bytes and str). That's not correct: s# is used in Python2 to get at the bytes representation of an object, not the text version. t# was specifically added to access a text version of the content. In Python3, this distinction is no longer available (for whatever reason), so only the bytes representation of the object remains. Looking at the implementation again, I found that y# rejects Unicode, while s# returns the default encoded version like t# does in Python2. So I have to correct what I said earlier: y# is not the right replacement for t# in order to stay compatible with its Python2 pendant. The t# implementation in Python3 is not compatible with the Python2 approach - it's in fact, a totally different parser, since Unicode no longer provides a buffer interface and thus cannot be used as input for t#. The only compatible pendant to the Python2 t# parser marker in Python3 appears to be s#. I'll have to think about this some more, but seen in that light, removing t# in Python3 may actually be a better strategy after all - mostly to remove a misguided forward-porting attempt and to reduce the number of surprising extension writer will see when porting their apps to Python3. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8843] urllib2 Digest Authorization uri must match request URI
New submission from Andrew Nelis andrew.ne...@gmail.com: When using Digest authentication to authenticate with a web server, according to rfc2617 (section 3.2.2.5) the uri in the Authorization header MUST match the request URI. urllib2.AbstractDigestAuthHandler doesn't honour this when we request a url of the form 'http://hostname' without the trailing slash and we end up with request headers of the form: GET / 1.1 ... Authorization: Digest ... uri= - should be uri=/! A web server will return 400 Bad Request error. I attach a patch to fix urllib2.AbstractDigestAuthHandler.get_authorization that simply checks for the empty uri and uses '/' instead. It's the same thing that httplib.HTTPConnection does when it builds the GET line. However I do wonder if this uri normalisation should be part of Request.get_selector? Following is a script to demonstrate the behaviour, if you call it as: ./do_digest_request.py http://myserver username password (and assuming myserver is using Digest authentication) there will a 400 response instead of it working. --- do_digest_request.py #!/usr/bin/env python import sys import urllib2 import urlparse def request( url, username, password ): p = urlparse.urlparse( url ) password_manager = urllib2.HTTPPasswordMgrWithDefaultRealm() password_manager.add_password( None, p.hostname, username, password ) handlers = [ urllib2.HTTPDigestAuthHandler( password_manager ), ] opener = urllib2.build_opener( *handlers ) request = urllib2.Request( url ) response = opener.open( request ) response.read() if __name__ == '__main__': request( sys.argv[1], sys.argv[2], sys.argv[3] ) -- components: Library (Lib) files: urllib2.diff keywords: patch messages: 106649 nosy: anelis priority: normal severity: normal status: open title: urllib2 Digest Authorization uri must match request URI type: behavior versions: Python 2.7 Added file: http://bugs.python.org/file17480/urllib2.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8843 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: STINNER Victor victor.stin...@haypocalc.com added the comment: Those two encoder functions were meant to be used by Python codec implementations which want to use the readbuffer and charbuffer interfaces available in Python via s# and t# to access input object data. Ah ok. They are not used by the builtin codecs, but may well be in use by 3rd party codecs. My quick Google search didn't found any of those. I suppose that str and bytes are enough for most people. Do you know an usecase of text or bytes stored in different types than str and bytes? (I suppose the bytearray is compatible with bytes, and so it can be used instead of bytes) Any Python object can expose a buffer interface and the above functions then allow accessing these interfaces from within Python. Think of e.g. memory mapped files, image/audio/video objects, database BLOBs, scientific data types, numeric arrays, etc. There are lots of such object types. I'm not sure why you think those functions are not encoders. I consider that Python3 codecs module only encode and decode text to/from an encoding, whereas Python2 had extra unrelated codecs like base64 or hex (but it was decided to remove them to cleanup the codecs module). Those codecs will be reenabled in Python 3.2. Removing them was a mistake. The codec machinery is not limited to only working on Unicode and bytes. It can work on arbitrary type combinations, depending on what a codec wants to implement. -- title: Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() andcodecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2920] Patch to print symbolic value or errno in EnvironmentError.__str__()
Amaury Forgeot d'Arc amaur...@gmail.com added the comment: I don't like the import errno while printing an exception... It would be much more robust to store errorcode_dict in a static variable when python starts, and reuse it directly. -- nosy: +amaury.forgeotdarc ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2920 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8839] PyArg_ParseTuple(): remove t# format
STINNER Victor victor.stin...@haypocalc.com added the comment: Le vendredi 28 mai 2010 13:30:22, vous avez écrit : Looking at the implementation again, I found that y# rejects Unicode, while s# returns the default encoded version like t# does in Python2. Oh, I didn't noticed that. So I have to correct what I said earlier: y# is not the right replacement for t# in order to stay compatible with its Python2 pendant. The t# implementation in Python3 is not compatible with the Python2 approach - it's in fact, a totally different parser, since Unicode no longer provides a buffer interface and thus cannot be used as input for t#. The only compatible pendant to the Python2 t# parser marker in Python3 appears to be s#. I'll have to think about this some more, but seen in that light, removing t# in Python3 may actually be a better strategy after all - mostly to remove a misguided forward-porting attempt and to reduce the number of surprising extension writer will see when porting their apps to Python3. So t#, s# and y# are all different. I'm waiting for your final decision. reduce the number of surprising extension writer ... is a good argument in favor of removing t# :-) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Antoine Pitrou pit...@free.fr added the comment:
Any Python object can expose a buffer interface and the above
functions then allow accessing these interfaces from within
Python.
What's the point? The codecs functions already support objects exposing the
buffer interface:
b = b\xe9
codecs.latin_1_decode(memoryview(b))
('é', 1)
codecs.latin_1_decode(array.array(b, b))
('é', 1)
Those two functions are undocumented. They serve no useful purpose (you can
call the bytes(...) constructor instead, or even use the buffer object directly
as showed above). They are badly named since they don't have anything to do
with codecs. Google Code Search shows them not appearing anywhere else than
implementations of the Python stdlib. Removing them only seems reasonable.
--
nosy: +loewis, pitrou
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[issue2920] Patch to print symbolic value or errno in EnvironmentError.__str__()
Antoine Pitrou pit...@free.fr added the comment: Agreed with Amaury. Module import could fail for various reasons (perhaps the same ones which led to the exception being raised!), or could deadlock if the import lock is being held. Also, having __str__ fail is usually very annoying for users (especially when it's the __str__ of an exception object). If it's too hard to import errno at startup (because of bootstrapping), I would suggest using PyImport_ImportModuleNoBlock() instead, and silence errors (just print the numeric value of errno instead). -- nosy: +pitrou versions: +Python 2.7, Python 3.1, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2920 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2920] Patch to print symbolic value or errno in EnvironmentError.__str__()
Alexander Belopolsky alexander.belopol...@gmail.com added the comment: The patch already checks for failed import and falls back to printing numerical error code. However, I don't like the import either. I will think about the alternatives. On May 28, 2010, at 8:27 AM, Antoine Pitrou rep...@bugs.python.org wrote: Antoine Pitrou pit...@free.fr added the comment: Agreed with Amaury. Module import could fail for various reasons (perhaps the same ones which led to the exception being raised!), or could deadlock if the import lock is being held. Also, having __str__ fail is usually very annoying for users (especially when it's the __str__ of an exception object). If it's too hard to import errno at startup (because of bootstrapping), I would suggest using PyImport_ImportModuleNoBlock() instead, and silence errors (just print the numeric value of errno instead). -- nosy: +pitrou versions: +Python 2.7, Python 3.1, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2920 ___ -- nosy: +Alexander.Belopolsky ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2920 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Marc-Andre Lemburg m...@egenix.com added the comment:
Antoine Pitrou wrote:
Antoine Pitrou pit...@free.fr added the comment:
Any Python object can expose a buffer interface and the above
functions then allow accessing these interfaces from within
Python.
What's the point? The codecs functions already support objects exposing the
buffer interface:
b = b\xe9
codecs.latin_1_decode(memoryview(b))
('é', 1)
codecs.latin_1_decode(array.array(b, b))
('é', 1)
Those two functions are undocumented. They serve no useful purpose (you can
call the bytes(...) constructor instead, or even use the buffer object
directly as showed above). They are badly named since they don't have
anything to do with codecs. Google Code Search shows them not appearing
anywhere else than implementations of the Python stdlib. Removing them only
seems reasonable.
readbuffer_encode and charbuffer_encode convert objects to bytes
and provide a codec encoder interface for this, hence the naming.
They are meant to be used as encode methods for codecs, just like
the other *_encode functions exposed in the _codecs module, e.g.
class BinaryDataCodec(codecs.Codec):
# Note: Binding these as C functions will result in the class not
# converting them to methods. This is intended.
encode = codecs.readbuffer_encode
decode = codecs.latin_1_decode
While it's possible to emulate the functions via other methods,
these methods always introduce intermediate objects, which isn't
necessary and only costs performance.
Given than t# was basically rendered useless in Python3 (see
issue8839), removing charbuffer_encode() is indeed possible,
so
+1 on removing charbuffer_encode()
-1 on removing readbuffer_encode()
--
title: Remove codecs.readbuffer_encode() andcodecs.charbuffer_encode() -
Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
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[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Éric Araujo mer...@netwok.org added the comment: I’d be grateful if someone could post links to discussion about the removal of codecs like hex and rot13 and about their coming back. It may be useful for a NEWS entry too, not just for my personal curiosity ;) I’ll try to find them next week or so if nobody posts them before. Thanks. -- nosy: +merwok ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Antoine Pitrou pit...@free.fr added the comment: class BinaryDataCodec(codecs.Codec): # Note: Binding these as C functions will result in the class not # converting them to methods. This is intended. encode = codecs.readbuffer_encode decode = codecs.latin_1_decode What's the point, though? Creating a non-symmetrical codec doesn't sound like a very useful or recommandable thing to do. Especially in the py3k codec model where encode() only works on unicode objects. While it's possible to emulate the functions via other methods, these methods always introduce intermediate objects, which isn't necessary and only costs performance. The bytes() constructor doesn't (shouldn't) create any more intermediate objects than read/charbuffer_encode() do. And all this doesn't address the fact that these functions have never been documented, and don't seem used in the outside world (understandably so, since there's no way to know about their existence, and their intended use). -- title: Remove codecs.readbuffer_encode()and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
STINNER Victor victor.stin...@haypocalc.com added the comment: I’d be grateful if someone could post links to discussion about the removal of codecs like hex and rot13 r55932 (~3 years ago): Rip out all codecs that can't work in a unicode/bytes world: base64, uu, zlib, rot_13, hex, quopri, bz2, string_escape. However codecs.escape_encode() and codecs.escape_decode() still exist, as they are used for pickling str8 objects (so those two functions can go, when the str8 type is removed). There were removed 1 year and an half before Python 3.0 release. ... and about their coming back which coming back? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Éric Araujo mer...@netwok.org added the comment: Thanks for the link. Do you have a pointer to the PEP or ML thread discussing that change? “Which coming back?” Martin said these codecs are coming back in 3.2. -- title: Remove codecs.readbuffer_encode()and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8843] urllib2 Digest Authorization uri must match request URI
Changes by Antoine Pitrou pit...@free.fr: -- assignee: - orsenthil nosy: +orsenthil stage: - patch review versions: +Python 2.6, Python 3.1, Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8843 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8839] PyArg_ParseTuple(): remove t# format
Changes by Antoine Pitrou pit...@free.fr: -- nosy: +loewis ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
STINNER Victor victor.stin...@haypocalc.com added the comment: Martin said these codecs are coming back in 3.2. Oh, there is the issue #7485 where Martin wrote: * 2009-12-10 23:15: It was a mistake that they were integrated * 2009-12-12 19:25: I would still be opposed to such a change (...) adding them would be really confusing. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7475] codecs missing: base64 bz2 hex zlib ...
Changes by STINNER Victor victor.stin...@haypocalc.com: -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Walter Dörwald wal...@livinglogic.de added the comment: I’d be grateful if someone could post links to discussion about the removal of codecs like hex and rot13 r55932 (~3 years ago): That was my commit. ;) Thanks for the link. Do you have a pointer to the PEP or ML thread discussing that change? The removal is documented here: http://www.artima.com/weblogs/viewpost.jsp?thread=208549 We are adopting a slightly different approach to codecs: while in Python 2, codecs can accept either Unicode or 8-bits as input and produce either as output, in Py3k, encoding is always a translation from a Unicode (text) string to an array of bytes, and decoding always goes the opposite direction. This means that we had to drop a few codecs that don't fit in this model, for example rot13, base64 and bz2 (those conversions are still supported, just not through the encode/decode API). A post by Georg Brandl about this is at http://mail.python.org/pipermail/python-3000/2007-June/008420.html (Note that this thread began in private email between Guido, MvL, Georg and myself. If needed I can dig up the emails.) -- nosy: +doerwalter ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Marc-Andre Lemburg m...@egenix.com added the comment: Antoine Pitrou wrote: Antoine Pitrou pit...@free.fr added the comment: class BinaryDataCodec(codecs.Codec): # Note: Binding these as C functions will result in the class not # converting them to methods. This is intended. encode = codecs.readbuffer_encode decode = codecs.latin_1_decode What's the point, though? Creating a non-symmetrical codec doesn't sound like a very useful or recommandable thing to do. Why not ? If you're only interested in the binary data and don't care about the original input object type, that's a very natural thing to do. E.g. you could use a memory mapped file as input to the encoder. Would you really expect the codec to recreate such a file object when decoding the binary data ? Especially in the py3k codec model where encode() only works on unicode objects. That's a common misunderstanding. The codec system does not mandate a specific type combination. Only the helper methods .encode() and .decode() on bytes and str objects in Python3 do. While it's possible to emulate the functions via other methods, these methods always introduce intermediate objects, which isn't necessary and only costs performance. The bytes() constructor doesn't (shouldn't) create any more intermediate objects than read/charbuffer_encode() do. Looking at the code, the data takes quite a long path through the whole machinery. For non-Unicode objects, it always tries to create an integer and only if that fails reverts back to the buffer interface after a few more function calls. Furthermore, the bytes() constructor accepts a lot more objects than the s# parser marker, e.g. lists of integers, plain integers, arbitrary iterators, which a codec just interested in the binary representation of an object via the buffer interface most likely doesn't want to accept. And all this doesn't address the fact that these functions have never been documented, and don't seem used in the outside world (understandably so, since there's no way to know about their existence, and their intended use). That's a documentation bug and probably the result of the fact that none of the exposed encoder/decoder APIs are documented. -- title: Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode()and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
STINNER Victor victor.stin...@haypocalc.com added the comment: Oh, there is the issue #7485 where Martin wrote: Copy/paste failure: issue #7475. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: Martin said these codecs are coming back in 3.2. I said that and it was discussed on the python-dev mailing list a while back. We'll also add .transform() methods on bytes and str objects to access same-type codecs. -- title: Remove codecs.readbuffer_encode()and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
STINNER Victor victor.stin...@haypocalc.com added the comment: readbuffer_encode() and charbuffer_encode() are not really encoder nor related to encodings: they are related to PyBuffer That was the initial problem: codecs is specific to encodings (in Python3), encodes str to bytes, and decodes bytes (or any read buffer) to str. I don't like readbuffer_*encode* and *charbuffer_encode* function names, because there are different than other codecs: they encode *bytes* to bytes (and not str to bytes). I think that these functions should be removed or moved somewhere else under a different name. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Antoine Pitrou pit...@free.fr added the comment: And all this doesn't address the fact that these functions have never been documented, and don't seem used in the outside world (understandably so, since there's no way to know about their existence, and their intended use). That's a documentation bug and probably the result of the fact that none of the exposed encoder/decoder APIs are documented. Are you planning to fix it? It is not obvious anybody else is able to properly document those functions. -- title: Remove codecs.readbuffer_encode() andcodecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8842] sqlite3 library outdated in Windows builds
Brian Curtin cur...@acm.org added the comment: SQLite was upgraded to 3.6.21 about 4 months ago for 2.7 and 3.2. -- nosy: +brian.curtin resolution: - out of date status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8842 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7475] codecs missing: base64 bz2 hex zlib ...
STINNER Victor victor.stin...@haypocalc.com added the comment: I agree with Martin: codecs choosed the wrong direction in Python2, and it's fixed in Python3. The codecs module is related to charsets (encodings), should encode str to bytes, and should decode bytes (or any read buffer) to str. Eg. rot13 encodes str to str. base64 bz2 hex zlib ...: use base64, bz2, binascii and zlib modules for that. The documentation should be fixed (explain how to port code from Python2 to Python3). It's maybe possible for write some 2to3 fixers for the following examples: encode(base64) = base64.b64encode(...) encode(rot13) = do nothing (but display a warning?) encode(zlib) = zlib.compress(...) encode(hex) = base64.b16encode(...) encode(bz2) = bz2.compress(...) decode(base64) = base64.b64decode(...) decode(rot13) = do nothing (but display a warning?) decode(zlib) = zlib.decompress(...) decode(hex) = base64.b16decode(...) decode(bz2) = bz2.decompress(...) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7475] codecs missing: base64 bz2 hex zlib ...
STINNER Victor victor.stin...@haypocalc.com added the comment: Explanation the change in Python3 by Guido: We are adopting a slightly different approach to codecs: while in Python 2, codecs can accept either Unicode or 8-bits as input and produce either as output, in Py3k, encoding is always a translation from a Unicode (text) string to an array of bytes, and decoding always goes the opposite direction. This means that we had to drop a few codecs that don't fit in this model, for example rot13, base64 and bz2 (those conversions are still supported, just not through the encode/decode API). http://www.artima.com/weblogs/viewpost.jsp?thread=208549 -- See also issue #8838. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4015] [patch] make installed scripts executable on windows
Per pybugs.pho...@safersignup.com added the comment: On POSIX the interpreter will be read from the first line of a file. On Windows the interpreter will be read from the Registry HKEY_CLASSES_ROOT\.file-extension . So the correct way to associate a interpreter to a file is to invent a file-extension for every interpreter. Like /usr/bin/python /usr/bin/python3 and /usr/bin/python3.1 on POSIX, there should be .py .py3 and .py31 on Windows! I attached a example-registry-patch to register extensions for 2.5, 2.6 and 3.1 . If you want to use it, you need to adjust the paths! I propose to change all Python-Windows-installer to install versioned extensions. If you want a switcher application, it should read the first line of the script and match it against .*/python(.*)$. So the default POSIX #!/usr/bin/python3.1 can be kept unchanged. With that rexex the app-path can be read from HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\regex-match\InstallPath\. BTW. It would be nice if Python would call itself Python 3.1 instead of python in the Open with...-list! The current naming is problematic if you install more than one Python version. -- nosy: +phobie Added file: http://bugs.python.org/file17481/hklm_python_extensions.reg ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4015 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8838] Remove codecs.readbuffer_encode() and codecs.charbuffer_encode()
Éric Araujo mer...@netwok.org added the comment: I don't like readbuffer_*encode* and *charbuffer_encode* function names, because there are different than other codecs “transform” as hinted by MvL seems perfect. Thanks everyone for the pointers here and in #7475! I’ll search the missing one (“it was discussed on the python-dev mailing list a while back”) later. -- title: Remove codecs.readbuffer_encode()and codecs.charbuffer_encode() - Remove codecs.readbuffer_encode() and codecs.charbuffer_encode() ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8838 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4015] [patch] make installed scripts executable on windows
Éric Araujo mer...@netwok.org added the comment: Related to #870479 (should we make that one a meta-bug?) -- nosy: +merwok ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4015 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7475] codecs missing: base64 bz2 hex zlib ...
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: STINNER Victor victor.stin...@haypocalc.com added the comment: I agree with Martin: codecs choosed the wrong direction in Python2, and it's fixed in Python3. The codecs module is related to charsets (encodings), should encode str to bytes, and should decode bytes (or any read buffer) to str. No, that's just not right: the codec system in Python does not mandate the types used or accepted by the codecs. The only change that was applied in Python3 was to make sure that the str.encode() and bytes.decode() methods always return the same type to assure type-safety. Python2 does not apply that check, but instead provides a direct interface to codecs.encode() and codecs.decode(). Please don't mix the helper methods on those objects with what the codec system was designed for. The helper methods apply a strategy that's more constrained than the codec system. The addition of .transform() and .untransform() for same type conversions was discussed in 2008, but didn't make it into 3.0 since I hadn't had time to add the methods: http://mail.python.org/pipermail/python-3000/2008-August/014533.html http://mail.python.org/pipermail/python-3000/2008-August/014533.html http://mail.python.org/pipermail/python-3000/2008-August/014534.html The removed codecs don't rely on the helper methods in any way. They are easily usable via codecs.encode() and codecs.decode() even without .transform() and .untransform(). Esp. the hex codec is very handy and at least in our eGenix code base in wide-spread use. Using a single well-defined interface to such encodings is just much more user friendly than having to research the different APIs for each of them. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7475] codecs missing: base64 bz2 hex zlib ...
Changes by Éric Araujo mer...@netwok.org: -- nosy: +merwok ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1759169] clean up Solaris port and allow C99 extension modules
Martin v. Löwis mar...@v.loewis.de added the comment: Thanks for the patch. Committed as r81582 and r81583. Antoine was right: subsequent references to Solaris needed to be removed also. -- resolution: - accepted status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1759169 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1100562] deepcopying listlike and dictlike objects
Changes by Ryan Coyner rcoy...@gmail.com: -- nosy: +rcoyner ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1100562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8713] multiprocessing needs option to eschew fork() under Linux
Changes by Ryan Coyner rcoy...@gmail.com: -- nosy: +rcoyner ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8713 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8405] Improve test_os._kill (failing on slow machines)
Brian Curtin cur...@acm.org added the comment: Committed to trunk in r81584 and py3k in r81585. -- resolution: - fixed stage: patch review - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8405 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8405] Improve test_os._kill (failing on slow machines)
STINNER Victor victor.stin...@haypocalc.com added the comment: Committed to trunk in r81584 and py3k in r81585 sparc solaris10 gcc trunk buildbot slave doesn't compile anymore. I'm not sure that it's related, so I prefer to not reopen the issue :-) http://www.python.org/dev/buildbot/trunk/builders/sparc%20solaris10%20gcc%20trunk/builds/891 --- ... building '_struct' extension gcc -fPIC -fno-strict-aliasing -g -O2 -g -O0 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -I/usr/local/include -I/home2/buildbot/slave/trunk.loewis-sun/build/Include -I/home2/buildbot/slave/trunk.loewis-sun/build -c /home2/buildbot/slave/trunk.loewis-sun/build/Modules/_struct.c -o build/temp.solaris-2.10-sun4u-2.7-pydebug/home2/buildbot/slave/trunk.loewis-sun/build/Modules/_struct.o gcc -shared build/temp.solaris-2.10-sun4u-2.7-pydebug/home2/buildbot/slave/trunk.loewis-sun/build/Modules/_struct.o -L/usr/local/lib -o build/lib.solaris-2.10-sun4u-2.7-pydebug/_struct.so Assertion failed: min = 0, file Python/getargs.c, line 1826 *** Error code 134 The following command caused the error: case $MAKEFLAGS in \ *s*) CC='gcc' LDSHARED='gcc -shared' LDFLAGS='' OPT='-g -O0 -Wall -Wstrict-prototypes' ./python -E ./setup.py -q build;; \ *) CC='gcc' LDSHARED='gcc -shared' LDFLAGS='' OPT='-g -O0 -Wall -Wstrict-prototypes' ./python -E ./setup.py build;; \ esac make: Fatal error: Command failed for target `sharedmods' program finished with exit code 1 --- -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8405 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
