Re: Delete values from a string using the index
In message [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: How do I delete or remove values from a list or string using the index. Note you can't do it with a string, since that's not mutable. -- http://mail.python.org/mailman/listinfo/python-list
Re: Using closures and partial functions to eliminate redundant code
En Wed, 26 Sep 2007 23:01:17 -0300, Matthew Wilson [EMAIL PROTECTED] escribi�: I wrote some code to create a user and update a user on a remote box by sending emails to that remote box. When I was done, I realized that my create_user function and my update_user function were effectively identical except for different docstrings and a single different value inside: I would have used an object with two methods... But this is just another example of the closure/object dichotomy. Some enlightment: http://people.csail.mit.edu/gregs/ll1-discuss-archive-html/msg03277.html -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: database persistence with mysql, sqlite
Lawrence D'Oliveiro wrote:
Bryan Olson wrote:
Lawrence D'Oliveiro wrote:
In Bryan Olson wrote:
coldpizza wrote:
It turned out that the method above ('SELECT * FROM TABLE LIMIT L1,
L2') works ok both with mysql and sqlite3, therefore I have decided to
stick with it until I find something better. With Sqlite3 you are
supposed to use LIMIT 10 OFFSET NN, but it also apparently supports
the mysql syntax (LIMIT NN, 10) for compatibility reasons.
A more reliable form is along the lines:
SELECT keyfield, stuff
FROM table
WHERE keyfield ?
ORDER BY keyfield
LIMIT 10
With the right index, it's efficient.
But that involves keeping track of the right starting keyfield value for
the next batch of records, which is complicated and nontrivial.
We write the link so that the browser will send back the parameter we
need. If the largest keyfield value on the page is
Two-Sheds the link might read:
A HREF=http://rfh.uk/tablnext.cgi?start=Two-Sheds;Next/A
That's assuming keyfield is a) unique,
Exactly; that was was the idea behind the name choice. The
method extends to multi-column keys, so it is generally
applicable.
and b) a relevant ordering for
displaying to the user.
That's a nice-to-have, but not required.
Keeping a cursor with pending data across HTTP requests is
a world of hurt.
limit offset, count avoids all that.
It can be stateless, but then it is unreliable. Here's an
example with Python 2.5:
import sqlite3
db = sqlite3.connect(:memory:)
# Simple table, an integer and the hex for that integer
db.execute(
CREATE TABLE numbers (num INTEGER PRIMARY KEY, hex TEXT))
# Start with 10-29 in the table
for i in range(10, 30):
db.execute(INSERT INTO numbers VALUES (?, ?), (i, hex(i)))
# Print 4 records starting at offset
def next4(offset):
cur = db.execute(
SELECT * FROM numbers LIMIT 4 OFFSET ?,
(offset,))
for x in cur:
print x
# Walk the table with LIMIT and OFFSET
next4(0) # Good, prints 10-13
next4(4) # Good, prints 14-17
# Another transaction inserts new records
for i in range(0, 4):
db.execute(INSERT INTO numbers VALUES (?, ?), (i, hex(i)))
next4(8) # Bad, prints 14-17 again
# Another transaction deletes records
for i in range(0, 4):
db.execute(DELETE FROM numbers WHERE num = ?, (i,))
next4(12) # Bad, we're missing 18-21
The method I advocated is still not the same as doing the
whole thing in a serializable transaction, but it will
return any record that stays in the table the whole time,
and will not return any record multiple times.
--
--Bryan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python class method as an argument of a function in a C extension
On 26 Set, 19:00, Matimus [EMAIL PROTECTED] wrote: Can anybody give me an hint (or some link) on how to define 'aCFunction' and how to call 'self.myMethod' in the C source code? A python function defined in C accepts a pointer to self and a tuple of arguments, each of which is also a PyObject. If you pass a function or method, it will be included in the tuple of arguments. I don't think there is any difference between passing a method and a function. You can call that method using functions in the `Object Protocol' section of the API, such as PyObject_Call(...). Here is an example from the Python documentation:http://docs.python.org/ext/callingPython.html The first part shows how to get a function as an argument. The following bits of code show how to actually call that function.The example uses PyEval_CallObject, which I can't find documentation to. I'm not sure if it even exists (it may be a documentation error). But from the example it seems to work exactly the same as PyObject_CallObject. Matt Thanks a lot! At last I succeeded in finding an example: http://mail.python.org/pipermail/python-list/1999-May/003441.html This uses exactly the PyObject_CallObject, as you suggest. Mauro -- http://mail.python.org/mailman/listinfo/python-list
Re: Asynchronous Messaging
En Thu, 27 Sep 2007 01:43:32 -0300, wink [EMAIL PROTECTED] escribi�: You are most correct, but Queue is slow compared to deque but not for the reason I guessed. Apparently it's because deque is implemented in C while Queue is in python. Using the program below it looks there is about a 35:1 speed difference. That't not the reason. A Queue is built around a container, and it happens to be a deque in the default implementation. But the important thing is that a Queue is a synchronized object - it performs the necesary synchronization to ensure proper operation even from multiple threads attempting to use it at the same time. So your comparison is meaningless, apart from telling that using mutexes is not cheap. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: ~ bit-wise unary operator
Wow, so many answers :). Thank you, guys :). Lada Michal Bozon wrote: cau, maybe int is represented internally as a signed integer you can use numpy types: import numpy ~ numpy.uint16(7978) 57557 -m. On Thu, 27 Sep 2007 00:14:49 +0200, Ladislav Andel wrote: Hello, why ~ bit-wise unary operator returns -(x+1) and not bit inversion of the given integer? example: a = 7978 a = ~a python returns -7979 but I need to get back 57557 as in C language. which is also in binary 000100101010 and inverted 111011010101 Is here any other operator or do I have to write it on my own? Thank you, Lada -- http://mail.python.org/mailman/listinfo/python-list
Re: Google and Python
Nick Craig-Wood od.com wrote: Hendrik van Rooyen ma.p.co.za wrote: Paul Rubin http://lid wrote: Hendrik van Rooyen m..orp.co.za writes: Ok got it - so instead of starting a thread, as is current practice, you fork a process (possibly on another machine) and hand over the client. It is trivial to pass a socket to a new thread or a forked child - you don't need this mechanism for that. It doesn't work on different machines though - it has to be on the same machine. 8 - nice explanation by Nick--- How does a very large volume site work then? - there must be some way of sharing the load without bottlenecking it through one machine? - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
On 2007-09-26, Mark Summerfield [EMAIL PROTECTED] wrote: On 26 Sep, 13:22, Antoon Pardon [EMAIL PROTECTED] wrote: Well you should decide what you want. In a previous exchange one of the things that was wanted was that you could already seed a tree by using key word arguments so that you could do the following: t=Tree(a=15, b=30) which would be equivallent to: t=Tree() t.update(a=15,b=30) But with the above proposal t=Tree(cmp=cmp) is not equivallent to t=Tree() t.update(cmp=cmp) So it seems the API needs some more sorting out. I think you missed some of the previous postings. That is possible. The sorteddict API that has emerged so far is (1) apart from the constructor, everything is identical to dict, (2) the constructor takes the same args as sorted(), so if you want to seed with a dict or with keywords you write sorteddict(dict(a=1,b=2), ...), (or you could create a sorteddict and use update() since that takes the same args as dict's constructor). Could your AVLTree support cmp and keys and reverse? It already supports cmp. Although for the moment it is done by subclassing. Like the following. class myTree(AVLTree): @staticmethod def cmp(a, b); return I don't think adding support for keys will be difficult but it may be tedious. I would prefer not to support reverse because the effect can be acquired by the other two and in contradiction with sorting, I think using it will slow things down instead of speeding things up. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: strange behavious of the logging module?
Thanks Peter and Vinay, I finally understood. And indeed, removing the pyc-file in questions solves the problem - at least temporarily. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I get the value out of a DOM Element
kj7ny wrote:
I have been able to get xml.dom.minidom.parse('somefile.xml') and then
dom.getElementsByTagName('LLobjectID') to work to the point where I
get something like: [DOM Element: LLobjectID at 0x13cba08] which I
can get down to DOM Element: LLobjectID at 0x13cba08 but then I
can't find any way to just get the value out from the thing!
.toxml() returns something like: u'LLobjectID![CDATA[1871203]]/
LLobjectID'.
How do I just get the 1871203 out of the DOM Element?
It contains a CDATA node which in turn contains a Text node (AFAIR), so you
have to walk through the children to get what you want.
Alternatively, try an XML API that makes it easy to handle XML, like
ElementTree (part of the stdlin in Python 2.5) or lxml, both of which have
compatible APIs. The code would look like this:
tree = etree.parse(some_file.xml)
id = tree.find(//LLobjectID)
print id.text
Stefan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Using closures and partial functions to eliminate redundant code
Matthew Wilson a écrit : I wrote some code to create a user and update a user on a remote box by sending emails to that remote box. When I was done, I realized that my create_user function and my update_user function were effectively identical except for different docstrings and a single different value inside: ### VERSION ONE def create_user(username, userpassword, useremail): Send an email that will create a user in the remote system. # Build email email_body = USERNAME = %s USERPASSWORD = %s USEREMAIL = %s % (username, userpassword, useremail) # send it. send_email(subject=CREATE, body=email_body) def update_user(username, userpassword, useremail): Send an email that will update a user's password in the remote system. # Build email email_body = USERNAME = %s USERPASSWORD = %s USEREMAIL = %s % (username, userpassword, useremail) # send it. send_email(subject=UPDATE, body=email_body) ### END (snip) Finally, I came up with this approach: ### VERSION THREE from functools import partial def _h(mode, username, userpassword, useremail): if mode not in (create, update): raise ValueError(mode must be create or update!) # Build email email_body = USERNAME = %s USERPASSWORD = %s USEREMAIL = %s % (username, userpassword, useremail) # send it. send_email(subject=mode.upper(), body=email_body) # I can't figure out how to set up the docstring on these. v3_create_user = partial(_h, mode=create) v3_update_user = partial(_h, mode=update) ### END I'm interested to hear how other people deal with really similar code. Depends. The similarity just bugs me. However, I wonder if using stuff like closures or partial function application is needlessly showy. Not necessarily, but in this case, it's just overkill IMHO - I'd just have factored out the common code: def _build_email(username, userpassword, useremail): builds the email body used by create_uer and update_user return USERNAME = %s USERPASSWORD = %s USEREMAIL = %s % (username, userpassword, useremail) def create_user(username, userpassword, useremail): Send an email that will create a user in the remote system. send_email(subject=CREATE, body=_build_email(username, userpassword, useremail) ) def update_user(username, userpassword, useremail): Send an email that will update a user's password in the remote system. send_email(subject=UPDATE, body=_build_email(username, userpassword, useremail) ) Now there are of course cases where either closures and/or partials are the right thing to do. Also, I hope anyone here can help me figure out how to attach a meaningful docstring for my version three code. Didn't try, but what about: p = partial(func, arg) p.__doc__ = yadda yadda -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
Paul Hankin [EMAIL PROTECTED] wrote: A key which is in dict must be either in __keycache or in __addkeys, but never in both. Yes, I'm sorry: you're right. But there's a different bug: if you delete a key that's not in the dict, you'll add it to the deleted list before the exception for the missing key is raised. sd = sorteddict.sorteddict() sd['a'] = 'a' print sd.keys() = ['a'] try: del sd['b'] except: pass sd['b'] = 'b' print sd.keys() The second print statement produces ['a'] rather than ['a', 'b'] Yes, I think there are probably several cases where I need to account for exceptions. There's another serious problem: if Mark wants this module to be used and stand any chance at all of eventually being incorporated into the standard library, then he will have to change the license on his code: the GPL simply isn't an option here. -- http://mail.python.org/mailman/listinfo/python-list
Re: Google and Python
It is trivial to pass a socket to a new thread or a forked child - you don't need this mechanism for that. It doesn't work on different machines though - it has to be on the same machine. 8 - nice explanation by Nick--- How does a very large volume site work then? - there must be some way of sharing the load without bottlenecking it through one machine? Large sites do load balancing (caching, dns round robin, reverse proxies, etc) over many hosts. Passing connection handles around on a single host is a different type of optimization. See this link for info on how Wikipedia handles their load-balancing: http://en.wikipedia.org/wiki/Wikipedia#Software_and_hardware -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
Mark Summerfield wrote: The sorteddict API that has emerged so far is (1) apart from the constructor, everything is identical to dict, (2) the constructor takes the same args as sorted(), so if you want to seed with a dict or with keywords you write sorteddict(dict(a=1,b=2), ...), (or you could create a sorteddict and use update() since that takes the same args as dict's constructor). Could your AVLTree support cmp and keys and reverse? I think you are expending too much effort on the no-brainers. Yes, AVL-trees can support cmp and keys and reverse. I cannot speak for Antoon, but have no doubt that adapting his code to do so is within his ability. Hrvoje Niksic is right that a simple layer over existing hashed dicts dooms the PEP to rejection. Thus the candidate algorithms are the approximately-balanced tree structures: AVL trees, red-black trees, 2-3 trees, b-trees, splay trees, or skip-lists. Implementing these is non-trivial, but easily within the ability of many people here. Don't worry about the coding. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
On 27 Sep, 08:32, Duncan Booth [EMAIL PROTECTED] wrote: Paul Hankin [EMAIL PROTECTED] wrote: A key which is in dict must be either in __keycache or in __addkeys, but never in both. Yes, I'm sorry: you're right. But there's a different bug: if you delete a key that's not in the dict, you'll add it to the deleted list before the exception for the missing key is raised. sd = sorteddict.sorteddict() sd['a'] = 'a' print sd.keys() = ['a'] try: del sd['b'] except: pass sd['b'] = 'b' print sd.keys() The second print statement produces ['a'] rather than ['a', 'b'] Yes, I think there are probably several cases where I need to account for exceptions. There's another serious problem: if Mark wants this module to be used and stand any chance at all of eventually being incorporated into the standard library, then he will have to change the license on his code: the GPL simply isn't an option here. I have fixed __addkey() and __removekey(): def __addkey(self, key): if key in self.__delkeys: self.__delkeys.remove(key) else: self.__addkeys.add(key) def __removekey(self, key): if key in self.__addkeys: self.__addkeys.remove(key) else: self.__delkeys.add(key) I have also fixed __delitem__(): try: dict.__delitem__(self, key) except KeyError: raise else: self.__removekey(key) As for the license, while it is on PyPI, I'll leave it as GPL v 3. If it was wanted for the standard library (and I can't see that ever happening), I will happily change it to the one that is preferred for Python modules. -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict [was a PEP proposal, but isn't anymore!]
On 26 Sep, 18:59, Raymond Hettinger [EMAIL PROTECTED] wrote: [Mark Summerfield] Below is a PEP proposal for a sorteddict. It arises out of a discussion on this list that began a few weeks ago with the subject of An ordered dictionary for the Python library? It is worth remembering that the long sought after datatype was a dict that could loop over keys in *insertion* order, not based on some function of the key itself. If there is positive feedback I will submit the PEP to the reviewers, so if you think it is a good idea please say so. As one who was submitted many PEPs, I can advise that the quickest way to irrevocably kill an idea is to submit a PEP to early (we almost didn't get genexps because the PEP was submitted pre-maturely). Instead, I advise posting an ASPN recipe so the details can be hammered-out and a fan club can be grown. For this particular idea, I am -1 on inclusion in the standard library. The PEP focuses mainly on implementation but is weakest in the rationale section. Its advantages over for k in sorted(d) are miniscule. To be considered for the collections module, there needs to be compelling use case advantages either in terms of usability or performance. [snip] I gave up on the idea of submitting it as a PEP many postings ago:-) I've now changed the subject line to reflect that. I will leave the pure python sorteddict on PyPI for anyone who wants it. I won't put it on the cookbook site for the time being, simply because it is eating up much more time than I thought! -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I get the value out of a DOM Element
On 27 Sep, 07:50, kj7ny [EMAIL PROTECTED] wrote:
I have been able to get xml.dom.minidom.parse('somefile.xml') and then
dom.getElementsByTagName('LLobjectID') to work to the point where I
get something like: [DOM Element: LLobjectID at 0x13cba08] which I
can get down to DOM Element: LLobjectID at 0x13cba08 but then I
can't find any way to just get the value out from the thing!
.toxml() returns something like: u'LLobjectID![CDATA[1871203]]/
LLobjectID'.
How do I just get the 1871203 out of the DOM Element?
DOM Level 3 provides the textContent property:
http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-textContent
You'll find this in libxml2dom and possibly some other packages such
as pxdom. For the above case with minidom specifically (at least with
versions I've used), you need to iterate over the childNodes of the
element, obtaining the nodeValue for each node and joining them
together. Something like this might do it:
.join([n.nodeValue for n in element.childNodes])
It's not pretty, but encapsulating stuff like this is what functions
are good for.
Paul
--
http://mail.python.org/mailman/listinfo/python-list
Re: Using closures and partial functions to eliminate redundant code
On Sep 27, 3:01 am, Matthew Wilson [EMAIL PROTECTED] wrote:
I wrote some code to create a user and update a user on a remote box by
sending emails to that remote box. When I was done, I realized that my
create_user function and my update_user function were effectively
identical except for different docstrings and a single different value
inside:
### VERSION ONE
def create_user(username, userpassword, useremail):
Send an email that will create a user in the remote system.
# Build email
email_body =
USERNAME = %s
USERPASSWORD = %s
USEREMAIL = %s
% (username, userpassword, useremail)
# send it.
send_email(subject=CREATE, body=email_body)
def update_user(username, userpassword, useremail):
Send an email that will update a user's password in the remote
system.
# Build email
email_body =
USERNAME = %s
USERPASSWORD = %s
USEREMAIL = %s
% (username, userpassword, useremail)
# send it.
send_email(subject=UPDATE, body=email_body)
If you don't mind what order the lines of your email appear in, you
might get more reuse out of something like this. As other's have said
partial isn't needed here.
def send_command_email(subject, **kwargs):
Send an email to the with the given subject, and lines of the
body of the form A = B for each keyword argument.
email_body = '\n'.join('%s = %s' % (k, kwargs[k]) for k in kwargs)
send_email(subject=subject, body='\n' + email_body + '\n'
def create_user(name, password, email):
Create a user by sending an email to the server
send_command_email('CREATE', USERNAME=name,
USERPASSWORD=password, USEREMAIL=email)
def update_user(name, password, email):
Update a user's details by sending an email to the server
send_command_email('UPDATE', USERNAME=name,
USERPASSWORD=password, USEREMAIL=email)
--
Paul Hankin
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter / Tk 8.5
On Thu, 27 Sep 2007 04:41:48 +0200, Scott David Daniels [EMAIL PROTECTED] wrote: Michal Bozon wrote: Today has been released a first beta of Tk 8.5, including a Ttk (tile) style engine, which makes possible the native look of widgets on MS platform, without having to install any extension. Is there a chance it will be included in 2.5.x, 2.6 or 3.0 ? This is just a guess, but: The beta: no way for anything. 2.5.x: also very unlikely 2.6: unlikely unless release is _soon_ (first alpha of 2.6 is out) It won't be: tcl/tk development is quite slow. There have been several months between each 5 or 6 alpha release and between the last alpha and the beta. So don't expect the official release to come soon... 3.0: much more likely, 3.0 won't be out for some time. This would be my guess too... -- python -c print ''.join([chr(154 - ord(c)) for c in 'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-']) -- http://mail.python.org/mailman/listinfo/python-list
Load balancing and passing sockets; was: Re: Google and Python
Hendrik van Rooyen wrote: Nick Craig-Wood wrote: [about passing sockets between processes] It is trivial to pass a socket to a new thread or a forked child - you don't need this mechanism for that. It doesn't work on different machines though - it has to be on the same machine. How does a very large volume site work then? - there must be some way of sharing the load without bottlenecking it through one machine? Several ways. The Domain Name System can provide multiple IP addresses for the same name. IP addresses often often lead to HTTP reverse proxies that shoot back cached replies to common simple requests, and forward the harder ones to the file/application servers, with intelligent load balancing. The services are surprisingly basic, and some excellent software is free: http://en.wikipedia.org/wiki/Round_robin_DNS http://en.wikipedia.org/wiki/Reverse_proxy http://en.wikipedia.org/wiki/Squid_proxy Web apps tend to scale just great, except when they need data that is both shared and modifiable. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
Mark Summerfield [EMAIL PROTECTED] wrote: As for the license, while it is on PyPI, I'll leave it as GPL v 3. If it was wanted for the standard library (and I can't see that ever happening), I will happily change it to the one that is preferred for Python modules. Ok, your choice, just be aware that by using such a restrictive license you will dissuade a lot of people from using your code. You've prevented your module being used in any existing projects with Python license, GPL v2, or probably any license other than GPL v3. -- http://mail.python.org/mailman/listinfo/python-list
No backend servers available using httplib
Hi there! I'm using a recipe found on ASPN [1] to upload some data to an external server. The request fails, and all I get in response is No backend servers available. So I'm wondering: Is this a known exception-message in httplib, or could it be an error in the requested external resource? [1]: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306 - Thanks, Henrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Using closures and partial functions to eliminate redundant code
Matthew Wilson wrote: I'm interested to hear how other people deal with really similar code. The similarity just bugs me. However, I wonder if using stuff like closures or partial function application is needlessly showy. ACK -- but not because it's showy, but because it may be more error-prone and less readable. I'd often use an approach like this: def create_user(username, userpassword, useremail, create = False): Send an email that will update a user in the remote system. If create evaluates to True, don't update the user, but create her instead. if not create: subject = UPDATE else: subject = CREATE # Build email email_body = USERNAME = %s USERPASSWORD = %s USEREMAIL = %s % (username, userpassword, useremail) # send it. send_email(subject=subject, body=email_body) Regards, Björn -- BOFH excuse #353: Second-system effect. -- http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict PEP proposal [started off as orderedict]
Duncan Booth [EMAIL PROTECTED] writes: Ok, your choice, just be aware that by using such a restrictive license you will dissuade a lot of people from using your code. You've prevented your module being used in any existing projects with Python license, GPL v2, or probably any license other than GPL v3. GPL2 projects seem to be migrating nicely to GPL3 so GPL2 shouldn't be too much of a problem. Since one of the Python license's goals is to allow re-use in proprietary programs, and the GPL family's main goal is the exact opposite, I'd say if someone chooses a GPL, then preventing the code from being used in a Python-licensed project was part of the intention and not an undesired consequence. While Python itself is unlikely to switch to a new license in order to import GPL code, other projects can and have done exactly that. -- http://mail.python.org/mailman/listinfo/python-list
URGENT REQUIREMENT FOR PYTHON DEVELOPERS
HI THIS IS KRISHNA KISHORE FROM MindRiver. We have an Urgent requirement for Python Developers who have 5-7 YRS of EXP. SKILLS :PYTHON AND C/C++ WORK LOCATION: BANGALROE PLEASE REVERT US WITH YOUR UPDATED PROFILES. Thanks Regards, Kishore Seethanraju |Senior Associate-People Consulting| MindRiver Information Technologies Pvt. Ltd. Suite# 512, 4th Floor and Suite # 104, Ground Floor ,Oxford Towers, 139, Airport Road, Bangalore 560 008| Tel: +91.80.3052.1600 |Direct: +91.80.3057.5799| Mobile: + 91.9901 96 1696 | Fax: +91.80.3057.5797| Email: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] | Web www.mindriver-it.com http://www.mindriver-it.com/ Information transmitted by this-mail is proprietary to MindRiver and / or its Customers and is intended for use only by the individual or entity to which it is addressed, and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please notify us immediately at the above mentioned telephone number or email to [EMAIL PROTECTED] and delete this mail from your records. We believe this email to be virus free but do not warrant that this is the case and we will not accept liability for any losses arising from any virus being transmitted unintentionally by us' -- http://mail.python.org/mailman/listinfo/python-list
Re: No backend servers available using httplib
Henrik Lied a écrit : Hi there! I'm using a recipe found on ASPN [1] to upload some data to an external server. The request fails, and all I get in response is No backend servers available. So I'm wondering: Is this a known exception-message in httplib, If it was, you should have a full traceback then. or could it be an error in the requested external resource? [1]: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306 From the recipe's code and the message, looks like you're connecting to (or via) a proxy which fails to relay to the real server. -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing elements of a list with a string
Hello,
Would that mean that if I wanted to append all the (date, time) tuples
to a list, I should do something like:
for file in list_of_backup_files:
some_list.append(file)
By the way I did this:
def listAllbackups(filename):
list_of_backups = glob(home+'/Desktop/backupdir/*%s*'%filename)
for element in list_of_back:
if element.find(file) != -1:
date_components = element.split('-')[-4:-1]
date = str(date_components[0]) + : +
str(date_components[1]) +
: + str(date_components[2])
time = element.split('-')[-1]
yield (date, time)
print listAllbackups('fstab')
I ran it in the terminal and I got:
generator object at 0x81ed58c
Why does it do that and not just print out all the values of (date,
time)
Regards,
Shriphani Palakodety
--
http://mail.python.org/mailman/listinfo/python-list
Re: Simple threading example freezes IDLE?
On Sep 26, 5:01 pm, Sergio Correia [EMAIL PROTECTED] wrote: I'm using IDLE 1.2.1, Python 2.5.1, and Tk 8.4. Does anyone has any idea of why is this happening? Two mainloops == bad. IDLE == 1 mainloop. your program == 1 mainloop. -- http://mail.python.org/mailman/listinfo/python-list
Re: No backend servers available using httplib
On Sep 27, 11:56 am, Bruno Desthuilliers bruno. [EMAIL PROTECTED] wrote: Henrik Lied a écrit : Hi there! I'm using a recipe found on ASPN [1] to upload some data to an external server. The request fails, and all I get in response is No backend servers available. So I'm wondering: Is this a known exception-message in httplib, If it was, you should have a full traceback then. or could it be an error in the requested external resource? [1]:http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306 From the recipe's code and the message, looks like you're connecting to (or via) a proxy which fails to relay to the real server. Hello Bruno, The actual reason was quite a bit simpler: The receiving server required a certain keyword to be first in the request - which I was not aware of. So now it works - but it's not perfect: Is there a way to stream the file content over the connection? The way it works now, the whole file is loaded into memory, right? -- http://mail.python.org/mailman/listinfo/python-list
mod_python preprocess/filter before proxy
Hi!
I've seen the message below in this python list, that seems to be
unanswered.
I'm trying to do the pretty same thing.
There's a way to preprocess the request with a mod_python handler and then
proxying it with mod_proxy?
Thank you very much in advance, and sorry for trying to revive such an old
message.
Cheers.
whale whale at mycameo.com
Tue Mar 25 05:49:42 CET 2003
I use Apache2.0.44 and mod_python3.0.1.
I add ProxyPass and PythonHandler directives in httpd.conf
## httpd.conf
ProxyPass /test/ http://www.test.com
ProxyPassReverse /test/ http://www.test.com
Location /
AddHandler python-program .htm .html
PythonHandler mptest
/Location
And mptest.py:
from mod_python import apache
def handler(req):
req.write('Hello!!')
return apache.OK
ex. My apache server is www.server.com.
When I browsed the local server request(ex.
http://www.server.com/1.html),
I received 'Hello!!' response, the python handler worked well.
But when I browse the proxy request(ex.
http://www.server.com/test/1.html),
the response I received is the original content of
http://www.test.com/1.html, not 'Hello!!'.
The proxy requests didn't seem to be processed by mod_python handler.
How could I pre-process the proxy request before mod_proxy module?
Thanks a lot!!
---
David Sanchez Martin
Administrador de Sistemas
[EMAIL PROTECTED]
GPG Key ID: 0x37E7AC1F
E2000 Nuevas Tecnologías
Tel : +34 902 19 61 77
BEGIN:VCARD
VERSION:2.1
N:Sánchez Martín;David
FN:David Sánchez Martín
ORG:E2000 Financial Investments, S.A.;Centro de Nuevas Tecnologías
TITLE:Administrador de Sistemas
TEL;WORK;VOICE:902196177
ADR;WORK;ENCODING=QUOTED-PRINTABLE:;;Agust=EDn Bravo 17 2=BA B=0D=0A33120 PRAVIA
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:Agust=EDn Bravo 17 2=BA B=0D=0A33120 PRAVIA
KEY;X509;ENCODING=BASE64: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==
EMAIL;PREF;INTERNET:[EMAIL PROTECTED]
REV:20070924T113755Z
END:VCARD
smime.p7s
Description: S/MIME cryptographic signature
--
http://mail.python.org/mailman/listinfo/python-list
ANN: RuPy 2008 Python Ruby Conference
RuPy 2008 Python Ruby Conference Poznan, Poland April 12-13, 2008 -- Call for speakers RuPy is a Ruby and Python conference. Held for the first time in April 2007 it gathered enthusiasts from Poland and other countries. The idea behind the conference was to liven up the Ruby and Python community and make these technologies more popular in Europe. The first conference was a middle-sized one but came out as a huge success. We believe it was a great experience for both attendees and speakers. RuPy 2008 committee is looking for speakers willing to present a Ruby/Python related subject. If you have an interesting talk in mind go ahead and submit a talk proposal. The talk proposal should include a talk title, brief introduction and your short resume/biography. To our invited speakers we offer free accommodation, full board and possibility to interact with a very lively IT community. You are also free to participate in all the extra events - last year's 'Geek party' turned out great! You can also support us by linking to this site and informing all your friends about the event and the possibility to submit a talk proposal. Potential presenters should submit an abstract to: [EMAIL PROTECTED] by December, 31th 2007 for consideration. If you have any special presentation needs, let us know. For more details check our site: http://www.rupy.eu Best regards, -- Jakub P. Nowak RuPy Committee -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
Joel wrote: I've been using this nice timing out decorator : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/307871 . The problem is that since it relies on sigalarm, it doesn't work under windows. Would anyone know how to do a cross-platform version? I don't think you're going to find anything straightforward. AFAIK, there's nothing on the Windows side of things which is directly equivalent to the signals business in *nix. Sure, you can mess around with timers and threads and events and so on. But it's far from being the built-in tool which the signal module gives you. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: No backend servers available using httplib
Henrik Lied wrote: On Sep 27, 11:56 am, Bruno Desthuilliers bruno. [EMAIL PROTECTED] wrote: Henrik Lied a écrit : Hi there! I'm using a recipe found on ASPN [1] to upload some data to an external server. The request fails, and all I get in response is No backend servers available. So I'm wondering: Is this a known exception-message in httplib, If it was, you should have a full traceback then. or could it be an error in the requested external resource? [1]:http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306 From the recipe's code and the message, looks like you're connecting to (or via) a proxy which fails to relay to the real server. Hello Bruno, The actual reason was quite a bit simpler: The receiving server required a certain keyword to be first in the request - which I was not aware of. So now it works - but it's not perfect: Is there a way to stream the file content over the connection? The way it works now, the whole file is loaded into memory, right? It appears not, as the httplib uses sendall on the underlying socket. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: URGENT REQUIREMENT FOR PYTHON DEVELOPERS
Krishna: You might want to consider reading http://www.python.org/community/jobs/howto/ and submitting these jobs to the Job Board. It's free. regards Steve [EMAIL PROTECTED] wrote: HI THIS IS KRISHNA KISHORE FROM MindRiver. We have an Urgent requirement for Python Developers who have 5-7 YRS of EXP. SKILLS :PYTHON AND C/C++ WORK LOCATION: BANGALROE PLEASE REVERT US WITH YOUR UPDATED PROFILES. Thanks Regards, Kishore Seethanraju |Senior Associate-People Consulting| MindRiver Information Technologies Pvt. Ltd. Suite# 512, 4th Floor and Suite # 104, Ground Floor ,Oxford Towers, 139, Airport Road, Bangalore 560 008| Tel: +91.80.3052.1600 |Direct: +91.80.3057.5799| Mobile: + 91.9901 96 1696 | Fax: +91.80.3057.5797| Email: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] | Web www.mindriver-it.com http://www.mindriver-it.com/ Information transmitted by this-mail is proprietary to MindRiver and / or its Customers and is intended for use only by the individual or entity to which it is addressed, and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please notify us immediately at the above mentioned telephone number or email to [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] and delete this mail from your records. We believe this email to be virus free but do not warrant that this is the case and we will not accept liability for any losses arising from any virus being transmitted unintentionally by us' -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing elements of a list with a string
Shriphani wrote:
Hello,
Would that mean that if I wanted to append all the (date, time) tuples
to a list, I should do something like:
for file in list_of_backup_files:
some_list.append(file)
That would be one way to do it (assuming you started with some_list as
an empty list). But a faster way would be to use a list comprehension
and say
some_list = [f for f in list_of_backup_files]
By the way I did this:
def listAllbackups(filename):
list_of_backups = glob(home+'/Desktop/backupdir/*%s*'%filename)
for element in list_of_back:
if element.find(file) != -1:
date_components = element.split('-')[-4:-1]
date = str(date_components[0]) + : +
str(date_components[1]) +
: + str(date_components[2])
time = element.split('-')[-1]
yield (date, time)
print listAllbackups('fstab')
I ran it in the terminal and I got:
generator object at 0x81ed58c
Why does it do that and not just print out all the values of (date,
time)
Because the generator object returned by the function has to be used in
an iterative context to produce its values. Which is why the list
comprehension produces a list!
If you don't really want a generator then you could just rewrite the
function to return a list in the first place. You did specifically ask
how do I use the yield statement If you are going to iterate o
ver the list then a generator is typically more memory-efficient
(because it only produces one element at a time), and can do things that
a list can't (like deal with a potentially infinite sequence of results).
regards
Steve
--
Steve Holden+1 571 484 6266 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://del.icio.us/steve.holden
Sorry, the dog ate my .sigline
--
http://mail.python.org/mailman/listinfo/python-list
Re: sorteddict [was a PEP proposal, but isn't anymore!]
I don't see a focused discussion of computational complexity of a sorted dict; its API cannot be simpler than sorting a dictionary and it has issues and complications that have already been discussed without completely satisfactory solutions, so the only possible reason to adopt a sorted dict is that some important use case for mapping types becomes significantly cheaper. With n entries, the size of a non-sorted hashtable, of a hashtable plus lists or sets of keys, and of reasonable sorted dict implementations with trees are all O(n). No substantial space advantage can be obtained by sorting dictionaries. Iterating through all n entries of a mapping, once, in sorted order, is O(n) time and O(1) space with an unsorted hash table, a hash table with a sorted list of the keys and all types of tree that I know of. If there is a performance gain, it must come from amortizing insertions, deletions and index-building. (The other operation, value updates for an existing key, doesn't matter: updates cause no structural changes and they must not invalidate any iterator.) Let's consider a very simple use case: n insertions followed by x iterations through all entries and n*y lookups by key. Cost for a hashtable and an ad hoc sorted list of the keys, fundamentally equivalent to sorting a Python dict: O(n) for insertions O(n log n) for indexing O(nx) for iterations O(ny) for lookups Cost for a tree: O(n log n) for insertions no indexing O(nx) for iterations O(ny log n) for lookups The hashtable comes out ahead because of cheaper lookups, for any x and y; note that without lookups there is no reason to use a mapping instead of a list of (key,value) tuples. With an equal number k of insertions and deletions between the iterations, the hashtable must be reindexed x times: O(n) for insertions O(kx) for updates and deletions O(nx log n) for indexing and reindexing O(nx) for iterations O(ny) for lookups The tree might be cheaper: O(n log n) for insertions O(kx log n) for updates and deletions no indexing and reindexing O(nx) for iterations O(ny log n) for lookups For a fixed small k, or with k proportional to n, reindexing the hashtable and lookups in the tree are equally mediocre. Maybe we could make k changes in the middle of each iteration. For a naively reindexed hashtable: O(n) for insertions O(kx) for updates and deletions O(knx log n) for indexing and reindexing O(nx) for iterations O(ny) for lookups For a tree, the costs remain as above: the new factor of n for the hashtable is fatal. Clever updates of the existing index or use of a heap would lower the cost, but they would need to be encapsulated as a sorteddict implementation. Is this a practical use case? When are sequential visits of all elements in order frequently suspended to make insertions and deletions, with a need for efficient lookup by key? - Priority queues; but given the peculiar pattern of insertions and deletions there are more suitable specialized data structures. - A* and similar best-first algorithms. It's a small but important niche; maybe it isn't important enough for the standard library. Other absent datatypes like heaps, an immutable mapping type similar to frozenset and tuple, or disjoint sets with would be more fundamental and general, and a mapping that remembers the order of insertion regardless of keys would be equally useful. In the Java collections framework all these kinds of mapping and others coexist peacefully, but Python doesn't have the same kitchen sink approach to basic libraries. Regarding the API, a sorted dict should not expose random access by an entry's position in the sequence: it is a gratuitous difficulty for the implementor and, more importantly, a perversion of the mapping data type. For that purpose there are lists and tuples, or explicit indices like those of the Boost multi-index containers (http:// www.boost.org/libs/multi_index). The only differences with dict should be the constraint that items(), keys(), values(), iteritems(), iterkeys(), itervalues() return entries sorted by key. Regards, Lorenzo Gatti -- http://mail.python.org/mailman/listinfo/python-list
Confusion regarding constructor as default value
Why are the following different? def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = tableRow def AddRow(self, rowName, tableRow): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = TableRow(ReleaseDate(), ExpiryDate()) It seems that when I use the first function that I'm getting duplicate objects in self.dict Thanks for your help, Aine. -- http://mail.python.org/mailman/listinfo/python-list
Mysqldb stderr
developing a daemon (using python 2.4 and mysqldb 1.2.1_p2) we notes that mysqldb class write on stderr some warnings and error asyncronously (uhmmm it's good written? ;P ). If stderr is closed these function raise up an I/O error (obviously). We spent a lot of time to understand for now we redirected stderr on /dev/null, but.. it's a workaround. Someone knows how stop write on stderr (and stdout) on mysqldb? Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Launching command on windows
Hy,
I'm working on windows and I try to do something like:
import os
APP = os.path.abspath(C:\\Program Files\\Notepad++\\notepad++.exe)
FILE1 = os.path.abspath(D:\\Documents and settings\\test1.py)
FILE2 = os.path.abspath(D:\\Documents and settings\\test2.py)
command = '%(app)s %(file1)s %(file2)s' % {
'app' : APP,
'file1' : FILE1,
'file2' : FILE2}
# === FOR 'DEBUG' ===
print APP
print FILE1
print FILE2
print command
print repr(command)
# === END FOR 'DEBUG' ===
os.system(command)
This code give in output:
C:\Program Files\Notepad++\notepad++.exe
D:\Documents and settings\test1.py
D:\Documents and settings\test2.py
C:\Program Files\Notepad++\notepad++.exe D:\Documents and settings
\test1.py D:\Documents and settings\test2.py
'C:\\Program Files\\Notepad++\\notepad++.exe D:\\Documents and
settings\\test1.py D:\\Documents and settings\\test2.py'
'C:\Program' n'est pas reconnu en tant que commande interne
ou externe, un programme ex,cutable ou un fichier de commandes.
# = My windows is a french one
# This error message could be translated as:
# 'c:\Program' is not an internal nor external command, an executable
program nor a command file
But if I copy the command in the output, an paste it in a console, it
work very well.
Does any of you know what I can do ?
PS: I think I'm oblige to add neer every path for spaces in path,
but if you know an other way, it could be cool :)
--
http://mail.python.org/mailman/listinfo/python-list
Re: What is a good way of having several versions of a python module installed in parallell?
On 2007-09-25, Joel Hedlund [EMAIL PROTECTED] wrote: First of all, thanks for all the input - it's appreciated. Otherwise, three words: test driven development Do you also do this for all the little stuff, the small hacks you just whip together to get a particular task done? My impression is that doing proper unittests adds a lot of time to development, and I'm thinking that this may be a low return investment for the small programs. For documentating and testing small hacks, try the doctest module. It integrates with Python's unit testing modules, so if you need to graduate, it is simple to do so. -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
On Sep 26, 5:21 am, Joel [EMAIL PROTECTED] wrote: I've been using this nice timing out decorator :http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/307871. The problem is that since it relies on sigalarm, it doesn't work under windows. Would anyone know how to do a cross-platform version? Thanks a lot! joel You might be able to use the timeit module. http://docs.python.org/lib/module-timeit.html Some people like to use hotshot: http://www.onlamp.com/pub/a/python/2005/12/15/profiling.html I doubt this is what you're looking for, but maybe it'll give you a push in the right direction. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
On Sep 26, 12:21 pm, Joel [EMAIL PROTECTED] wrote: I've been using this nice timing out decorator :http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/307871. The problem is that since it relies on sigalarm, it doesn't work under windows. Would anyone know how to do a cross-platform version? Thanks a lot! joel I found the solution : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440569 describes a solution based on threads. I tested it and it works perfectly. -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusion regarding constructor as default value
[EMAIL PROTECTED] wrote: Why are the following different? def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = tableRow def AddRow(self, rowName, tableRow): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = TableRow(ReleaseDate(), ExpiryDate()) It seems that when I use the first function that I'm getting duplicate objects in self.dict Thanks for your help, It's a FAQ. http://effbot.org/pyfaq/why-are-default-values-shared-between-objects.htm Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusion regarding constructor as default value
On 27 Sep, 15:03, [EMAIL PROTECTED] wrote: Why are the following different? def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = tableRow def AddRow(self, rowName, tableRow): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = TableRow(ReleaseDate(), ExpiryDate()) It seems that when I use the first function that I'm getting duplicate objects in self.dict Thanks for your help, Aine. I've just tried the following: Function A: def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): print tableRow if not self.dict.has_key(rowName): self.dict[rowName] = tableRow Function B: def AddRow(self, rowName, tableRow=None): if tableRow==None: tableRow = TableRow(ReleaseDate(), ExpiryDate()) # check to see if the row already exists, if not add it to the container print tableRow if not self.dict.has_key(rowName): self.dict[rowName] = tableRow Function A is giving: DatabaseExamination.TableRow instance at 0x011D4468 DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! Function B is giving: DatabaseExamination.TableRow instance at 0x011D0670 DatabaseExamination.TableRow instance at 0x011D0760 DatabaseExamination.TableRow instance at 0x011D07D8 DatabaseExamination.TableRow instance at 0x011D0850 So at least I know know what is causing the problem. But I'm still not understanding why I can't use TableRow() as the default value in order to geterate new instances. How would you implement this? Thanks, Aine. -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusion regarding constructor as default value
On 27 Sep, 15:34, Diez B. Roggisch [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Why are the following different? def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = tableRow def AddRow(self, rowName, tableRow): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = TableRow(ReleaseDate(), ExpiryDate()) It seems that when I use the first function that I'm getting duplicate objects in self.dict Thanks for your help, It's a FAQ. http://effbot.org/pyfaq/why-are-default-values-shared-between-objects... Diez- Dölj citerad text - - Visa citerad text - Cool, I understand now. It was my understanding of how Python works that was at fault. -- http://mail.python.org/mailman/listinfo/python-list
Translating Event.time from pyhook
I use pyhook to monitor user usage of keyboard and mouse. According to pyhook specs, event.time hold the number of seconds since the epoch. However, when I use the example source code I get numbers like 358054093, which translates to 07 May 1981.. Can anyone explain to me what am I doing wrong? Thanks. -- http://mail.python.org/mailman/listinfo/python-list
PyObject_CallObject: difference between functions and class methods
Hi all! I am trying to call within a C extension a Python function provided as an argument by the user with: PyObject_Call(). The C extension should work also if the user supplies a class method, but in this case I am getting an error. Do I need to explicitly pass 'self' as an argument to PyObject_Call()? If so, how can I do that? Now, I am using: if ((tmp_args = PyTuple_New(1)) == NULL) PyErr_SetString( PyExc_ReferenceError, attempt to access a null- pointer ); PyTuple_SetItem(tmp_args, 0, paramlist); to create the tuple required by PyObject_Call(), but I have no idea on how to add a reference to 'self'. Here is what I would like to obtain: ## import mymodule def myfunc(x): # Do something return [z] class MyClass: def mymethod(self, x): # Do something return z def runme(self): mymodule.main(myfunc) # This will work mymodule.main(self.mymethod) # This will not work (Segmentation fault) x = MyClass() x.runme() ## Thanks in advance. Mauro -- http://mail.python.org/mailman/listinfo/python-list
Emailing the attachment created with the Quick Screenshots Script (Python + PIL)
The Quick Screenshots Script (Python + PIL) is a dream come true, and yet so simple to use reliably. Does anyone have a suggestion or know how to include in the script, the ability to email the attachment? This would make the dream perfect! Thanks! Mark Bratcher Consolidated Citrus, LP 4210-250 Metro, Parkway Fort Myers, FL 33916 239-275-4060 ext 219 -- http://mail.python.org/mailman/listinfo/python-list
making run time changes..
Hi, I am new(almost) to python. I wish to making a server in which I can make changes at run time. For example , add a method to a class/attribute to object etc. by sending it messages. Can anyone help me with what features to look into and how to go about it. Are there any similar projects? Regards, Piyush -- http://mail.python.org/mailman/listinfo/python-list
Re: Launching command on windows
On 27 Set, 15:17, Alexandre Badez [EMAIL PROTECTED] wrote:
Hy,
I'm working on windows and I try to do something like:
import os
APP = os.path.abspath(C:\\Program Files\\Notepad++\\notepad++.exe)
FILE1 = os.path.abspath(D:\\Documents and settings\\test1.py)
FILE2 = os.path.abspath(D:\\Documents and settings\\test2.py)
command = '%(app)s %(file1)s %(file2)s' % {
'app' : APP,
'file1' : FILE1,
'file2' : FILE2}
# === FOR 'DEBUG' ===
print APP
print FILE1
print FILE2
print command
print repr(command)
# === END FOR 'DEBUG' ===
os.system(command)
This code give in output:
C:\Program Files\Notepad++\notepad++.exe
D:\Documents and settings\test1.py
D:\Documents and settings\test2.py
C:\Program Files\Notepad++\notepad++.exe D:\Documents and settings
\test1.py D:\Documents and settings\test2.py
'C:\\Program Files\\Notepad++\\notepad++.exe D:\\Documents and
settings\\test1.py D:\\Documents and settings\\test2.py'
'C:\Program' n'est pas reconnu en tant que commande interne
ou externe, un programme ex,cutable ou un fichier de commandes.
# = My windows is a french one
# This error message could be translated as:
# 'c:\Program' is not an internal nor external command, an executable
program nor a command file
But if I copy the command in the output, an paste it in a console, it
work very well.
Does any of you know what I can do ?
PS: I think I'm oblige to add neer every path for spaces in path,
but if you know an other way, it could be cool :)
If you don't mind using spawnl instead of system, this should work
even with spaces:
os.spawnl(os.P_NOWAITO, command)
I hope it helps.
Mauro
--
http://mail.python.org/mailman/listinfo/python-list
Re: Launching command on windows
On Sep 27, 8:17 am, Alexandre Badez [EMAIL PROTECTED] wrote:
Hy,
I'm working on windows and I try to do something like:
import os
APP = os.path.abspath(C:\\Program Files\\Notepad++\\notepad++.exe)
FILE1 = os.path.abspath(D:\\Documents and settings\\test1.py)
FILE2 = os.path.abspath(D:\\Documents and settings\\test2.py)
command = '%(app)s %(file1)s %(file2)s' % {
'app' : APP,
'file1' : FILE1,
'file2' : FILE2}
# === FOR 'DEBUG' ===
print APP
print FILE1
print FILE2
print command
print repr(command)
# === END FOR 'DEBUG' ===
os.system(command)
This code give in output:
C:\Program Files\Notepad++\notepad++.exe
D:\Documents and settings\test1.py
D:\Documents and settings\test2.py
C:\Program Files\Notepad++\notepad++.exe D:\Documents and settings
\test1.py D:\Documents and settings\test2.py
'C:\\Program Files\\Notepad++\\notepad++.exe D:\\Documents and
settings\\test1.py D:\\Documents and settings\\test2.py'
'C:\Program' n'est pas reconnu en tant que commande interne
ou externe, un programme ex,cutable ou un fichier de commandes.
# = My windows is a french one
# This error message could be translated as:
# 'c:\Program' is not an internal nor external command, an executable
program nor a command file
But if I copy the command in the output, an paste it in a console, it
work very well.
Does any of you know what I can do ?
PS: I think I'm oblige to add neer every path for spaces in path,
but if you know an other way, it could be cool :)
I got it to work using subprocess.Popen
Not sure why it doesn't work with os.system though.
Mike
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter / Tk 8.5
Michal Bozon wrote: Today has been released a first beta of Tk 8.5, including a Ttk (tile) style engine, which makes possible the native look of widgets on MS platform, without having to install any extension. http://wiki.tcl.tk/11075 http://sourceforge.net/mailarchive/message.php?msg_name=1190813039.46fa5d6f6a06b%40webmail.nist.gov Is there a chance it will be included in 2.5.x, 2.6 or 3.0 ? -m. Did you know that a wrapper for use with Tk 8.4.x is located here? http://tkinter.unpythonic.net/wiki/TileWrapper This does require a separate installation of the Tile libraries, but those can be obtained from ActiveState. I use this wrapper myself on OS X with a commercial application I develop, and Tile makes a big difference. (I maintain and update this wrapper at the wiki, but am not the original author.) --Kevin -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter / Tk 8.5
Eric Brunel wrote: On Thu, 27 Sep 2007 04:41:48 +0200, Scott David Daniels [EMAIL PROTECTED] wrote: Michal Bozon wrote: Today has been released a first beta of Tk 8.5, including a Ttk (tile) style engine, which makes possible the native look of widgets on MS platform, without having to install any extension. Is there a chance it will be included in 2.5.x, 2.6 or 3.0 ? This is just a guess, but: The beta: no way for anything. 2.5.x: also very unlikely 2.6: unlikely unless release is _soon_ (first alpha of 2.6 is out) It won't be: tcl/tk development is quite slow. There have been several months between each 5 or 6 alpha release and between the last alpha and the beta. So don't expect the official release to come soon... 3.0: much more likely, 3.0 won't be out for some time. This would be my guess too... I'd say that Tk 8.5 will be out before Python 3.0: the beta phase should be fairly efficient on Tk. -- Kevin Walzer Code by Kevin http://www.codebykevin.com -- http://mail.python.org/mailman/listinfo/python-list
Re: PyObject_CallObject: difference between functions and class methods
[ Note that there is now a mailing list dedicated to the C API:
http://mail.python.org/mailman/listinfo/capi-sig ]
mauro [EMAIL PROTECTED] writes:
I am trying to call within a C extension a Python function provided as
an argument by the user with: PyObject_Call(). The C extension should
work also if the user supplies a class method, but in this case I am
getting an error. Do I need to explicitly pass 'self' as an argument
to PyObject_Call()?
You don't. The reference to self will be added automatically when
invoking the function you receive as object.method.
if ((tmp_args = PyTuple_New(1)) == NULL)
PyErr_SetString( PyExc_ReferenceError, attempt to access a
null-
pointer );
PyTuple_SetItem(tmp_args, 0, paramlist);
Maybe you are mismanaging the reference count -- PyTuple_SetItem
steals the refcount of its argument. Anyway, why not use
PyObject_CallFunction or PyObject_CallFunctionObjArgs? For example:
PyObject *
mymodule_main(PyObject *ignored, PyObject *func)
{
PyObject *result, *my_param;
/* ... do something, e.g. create my_param ... */
/* call func */
result = PyObject_CallFunction(received_func, O, my_param);
Py_DECREF(my_param); /* assuming you no longer need it */
if (!result)
return NULL;
/* ... do something with result ... */
Py_DECREF(result);
Py_INCREF(Py_None);
return Py_None; /* or whatever */
}
--
http://mail.python.org/mailman/listinfo/python-list
Re: setuptools without unexpected downloads
On Sep 26, 5:52 pm, Steve Holden [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: On Sep 26, 8:30 am, Steve Holden [EMAIL PROTECTED] wrote: Fredrik Lundh wrote: Paul Boddie wrote: P.S. Of course, the package maintainer problem manifests itself most prominently on Windows where you often see people asking for pre-built packages or installers. for the record, I'd love to see a group of volunteers doing stuff like this for Windows. there are plenty of volunteers that cover all major Linux/*BSD distributions (tons of thanks to everyone involved in this!), but as far as I can remember, nobody has ever volunteered to do the same for Windows. I'd like to see something like this happen, too, and if a group of volunteers emerges I'll do what I can through the PSF to provide resources. Activities that benefit the whole community (or a large part of it) are, IMHO, well worth supporting. What would it entail to do this? Using py2exe + some installer (like Inno Setup) to create an installer that basically copies/installs the files into the site-packages folder or wherever the user chooses? If that's all it is, I would think it would be fairly easy to create these. Maybe I'm over-simplifying it though. What are a some examples of packages that need this? MySQLdb and psycopg are two obvious examples I have had to grub around or produce my own installers for. There's generally some configuration work to do for packages that have been produced without considering Windows requirements, and ideally this will be fed back to the developers. I think you may be oversimplifying a little. Pure Python packages aren't too problematic, it's mostly the extension modules. Unless a copy of Visual Studio is available (and we *might* get some cooperation from Microsoft there) that means resorting to MingW, which isn't an easy environment to play with (in my occasional experience, anyway). There's going to be increasing demand for 64-bit implementations too. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline Steve, We have Visual Studio 2005 at work and my boss is a Python nut, so I could probably use it. I also have academic versions of VS 6 and 2003 (maybe 2005 too...I forget, it might be 2004) at home as well...I think I can use those for open source development, although knowing Microsoft, there's probably something draconian hiding in the EULA somewhere. If someone is willing to give me some guidance, I'll give it a try. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusion regarding constructor as default value
[EMAIL PROTECTED] wrote: On 27 Sep, 15:03, [EMAIL PROTECTED] wrote: Why are the following different? def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = tableRow def AddRow(self, rowName, tableRow): # check to see if the row already exists, if not add it to the container if not self.dict.has_key(rowName): self.dict[rowName] = TableRow(ReleaseDate(), ExpiryDate()) It seems that when I use the first function that I'm getting duplicate objects in self.dict Thanks for your help, Aine. I've just tried the following: Function A: def AddRow(self, rowName, tableRow=TableRow(ReleaseDate(), ExpiryDate())): print tableRow if not self.dict.has_key(rowName): self.dict[rowName] = tableRow Function B: def AddRow(self, rowName, tableRow=None): if tableRow==None: tableRow = TableRow(ReleaseDate(), ExpiryDate()) # check to see if the row already exists, if not add it to the container print tableRow if not self.dict.has_key(rowName): self.dict[rowName] = tableRow Function A is giving: DatabaseExamination.TableRow instance at 0x011D4468 DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! DatabaseExamination.TableRow instance at 0x011D42B0 same! Function B is giving: DatabaseExamination.TableRow instance at 0x011D0670 DatabaseExamination.TableRow instance at 0x011D0760 DatabaseExamination.TableRow instance at 0x011D07D8 DatabaseExamination.TableRow instance at 0x011D0850 So at least I know know what is causing the problem. But I'm still not understanding why I can't use TableRow() as the default value in order to geterate new instances. Because the value of the default is computed as the funciton declaration is processed, whereas you seem to expect to see a new call to ExpiryDate each time the function is called. How would you implement this? Thanks, Aine. Function B is the canonical solution to this problem. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Getting web page throught a proxy (squid)
salut jean-paul, comment vas-tu ? vincent sabard.-- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
Joel [EMAIL PROTECTED] writes: I found the solution : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440569 describes a solution based on threads. I tested it and it works perfectly. Note that, unlike the original alarm code, it doesn't really interrupt the timed-out method, it just returns the control back to the caller, using an exception to mark that a timeout occurred. The timed out code is still merrily running in the background. I don't know if it's a problem in your case, but it's an important drawback. -- http://mail.python.org/mailman/listinfo/python-list
os.removedirs - How to force this delete?
I've been searching to find a way to force this delete to work even if the directory isn't empty. I've had no luck thus far. Anyone know what that would be? -- http://mail.python.org/mailman/listinfo/python-list
Re: Google and Python
On Sep 24, 10:40 am, [EMAIL PROTECTED] (Alex Martelli) wrote: Good motto. So is most of Google's code base now in Python? About what is the ratio of Python code to C++ code? Of course lines of code is kine of a bogus measure. Of all those cycles Google executes, about what portion are executed by a Python interpreter? I don't have those numbers at hand, and if I did they would be confidential I would be curious to know whether they code much mixed model coding. By that I mean (a) code your application in Python, and then (b) optimize it as necessary by moving some functionality into Python C/C++ modules. (Some of (b) may happen during design, of course.) I think of this as the state of the art in programming practice, and I wonder whether Google's doing this, or has a superior alternative. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I get the value out of a DOM Element
Forgot to mention I'm using Python 2.4.3. -- http://mail.python.org/mailman/listinfo/python-list
Pb with an AttributeError
Hello,
First, sorry for my english.
I've just been assigned a project written in Python which contains
bug(s).
I've never programmed in Python, but I've read the code
and understood basically what the different source codes do.
I've traced the code and found where the problem is but I don't
know how to solve the problem.
Here it is :
I've got a string issued from a CSV file :
string1 = eval(line[4])
print * string1 = (, string1 ,) \n
= * string1 = ( {'header': 'X-Score', 'param': {'key':
'SP136=', 'value': ['SD:0 ']} )
Then, there is a split with the equal :
TheParts = string.split(string1[param], =)
print * TheParts = (, TheParts ,) \n
But, running the program returns :
Traceback (most recent call last):
File C:\test\helper.py, line 136, in Action_handler
Score_eval(line, OutputFile_SP, This_Host)
File C:\test\helper.py, line 66, in Score_eval
TheParts = string.split(string1[param], =)
File C:\ActiveState\Python25\lib\string.py, line 290, in split
return s.split(sep, maxsplit)
AttributeError: 'dict' object has no attribute 'split' !?!
I've found that it works when I put directly the string in the split
expression :
TheParts = string.split( {'key': 'ESP136=', 'value': ['SHA:0 ']}
, =)
= * TheParts = [{'key': 'ESP136, ', 'value': ['SHA:0
']}]
But the code isn't dynamic anymore !
I think it's a problem with the type, but the different syntax I've
tried didn't work.
Is somebody could help me ?
Thank you
--
http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
On Sep 27, 4:36 pm, Hrvoje Niksic [EMAIL PROTECTED] wrote: Joel [EMAIL PROTECTED] writes: I found the solution : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440569 describes a solution based on threads. I tested it and it works perfectly. Note that, unlike the original alarm code, it doesn't really interrupt the timed-out method, it just returns the control back to the caller, using an exception to mark that a timeout occurred. The timed out code is still merrily running in the background. I don't know if it's a problem in your case, but it's an important drawback. There should be a method to stop the thread though? I've never programmed thread stuff in python and wasn't able to find how to do it, would you happen to know how to kill the timed out thread? -- http://mail.python.org/mailman/listinfo/python-list
Re: making run time changes..
Piyush Jain wrote: Hi, I am new(almost) to python. I wish to making a server in which I can make changes at run time. For example , add a method to a class/attribute to object etc. by sending it messages. Can anyone help me with what features to look into and how to go about it. Are there any similar projects? Take a look at Pyro (Python remote objects). It can almost certainly do what you want. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Traveling Europe
World's most popular traveling destinations http://world-traveling-destinations.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: setuptools without unexpected downloads
On Sep 26, 2:09 am, Ben Finney [EMAIL PROTECTED] wrote: behaviour with a specific invocation of 'setup.py'. But how can I disallow this from within the 'setup.py' program, so my users don't have to be aware of this unexpected default behaviour? I don't have the answer for this, but I can tell you that I myself dislike the auto-download behavior and I wish it worked differently. I've given up on setuptools/easy-install altogether. It is most annoying to end up with half a dozen unexpected packages. The default behavior should be to pop a question with a list of packages that will be downloaded (and have a flag that bypasses this). And of course being able to turn off this feature from setup.py. i. -- http://mail.python.org/mailman/listinfo/python-list
Re: Launching command on windows
On Sep 27, 4:20 pm, [EMAIL PROTECTED] wrote: I got it to work using subprocess.Popen Not sure why it doesn't work with os.system though. Mike Thanks Mike and Mauro, Mauro, your solution do not seems to work (or I made a mistake..) Mike your solution work great, thanks. But, I steel think it's a bug (python or window ??). I will try to take a look about it, when I have time. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: setuptools without unexpected downloads
[EMAIL PROTECTED] wrote: On Sep 26, 5:52 pm, Steve Holden [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: On Sep 26, 8:30 am, Steve Holden [EMAIL PROTECTED] wrote: Fredrik Lundh wrote: Paul Boddie wrote: P.S. Of course, the package maintainer problem manifests itself most prominently on Windows where you often see people asking for pre-built packages or installers. for the record, I'd love to see a group of volunteers doing stuff like this for Windows. there are plenty of volunteers that cover all major Linux/*BSD distributions (tons of thanks to everyone involved in this!), but as far as I can remember, nobody has ever volunteered to do the same for Windows. I'd like to see something like this happen, too, and if a group of volunteers emerges I'll do what I can through the PSF to provide resources. Activities that benefit the whole community (or a large part of it) are, IMHO, well worth supporting. What would it entail to do this? Using py2exe + some installer (like Inno Setup) to create an installer that basically copies/installs the files into the site-packages folder or wherever the user chooses? If that's all it is, I would think it would be fairly easy to create these. Maybe I'm over-simplifying it though. What are a some examples of packages that need this? MySQLdb and psycopg are two obvious examples I have had to grub around or produce my own installers for. There's generally some configuration work to do for packages that have been produced without considering Windows requirements, and ideally this will be fed back to the developers. I think you may be oversimplifying a little. Pure Python packages aren't too problematic, it's mostly the extension modules. Unless a copy of Visual Studio is available (and we *might* get some cooperation from Microsoft there) that means resorting to MingW, which isn't an easy environment to play with (in my occasional experience, anyway). There's going to be increasing demand for 64-bit implementations too. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline Steve, We have Visual Studio 2005 at work and my boss is a Python nut, so I could probably use it. I also have academic versions of VS 6 and 2003 (maybe 2005 too...I forget, it might be 2004) at home as well...I think I can use those for open source development, although knowing Microsoft, there's probably something draconian hiding in the EULA somewhere. If someone is willing to give me some guidance, I'll give it a try. Mike: The existing Python Windows installation is, IIRC, produced with VS 2003. Though much work has been done on making a VS2005 version, I do not believe it has yet been completed. But I don't believe there's anything horrendous in the EULA waiting to bite us in the ass. I think I could probably get Microsoft to make low-cost software available for individuals who were helping the Python community out in this way (and if not then I might persuade the PSF to apply some funding if individuals were seen to be committed to the task). At least as important as individual volunteers to do the packaging work (and feed back changes to non-Windows implementation teams) is the need for someone to coordinate all the work done on different packages. Without someone who has an overall grasp of what's going on such work might tend to founder. Are you interested in that side of things at all? I'm happy to give you what guidance I can [off line would probably be best], but my version of Visual Studio hasn't been used in two months ... regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Re: setuptools without unexpected downloads
[EMAIL PROTECTED] wrote: What would it entail to do this? Using py2exe + some installer (like Inno Setup) to create an installer that basically copies/installs the files into the site-packages folder or wherever the user chooses? if the setup.py file is properly built, python setup.py bdist_wininst builds an installer that does exactly that. ideally, someone doing this would: 1) build EXE installers and EGG:s for a reasonable number of Python versions (e.g. 2.3 and newer) for selected releases. if possible, using the same compilers as used for the python.org core distribution. 2) test the installers in some way (at least some kind of sanity checking is necessary; i.e. installing the kit and checking that the core modules can at least be imported). 3) if necessary, work with upstream providers to fix/improve setup.py and test code. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
Joel wrote: On Sep 27, 4:36 pm, Hrvoje Niksic [EMAIL PROTECTED] wrote: Joel [EMAIL PROTECTED] writes: I found the solution : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440569 describes a solution based on threads. I tested it and it works perfectly. Note that, unlike the original alarm code, it doesn't really interrupt the timed-out method, it just returns the control back to the caller, using an exception to mark that a timeout occurred. The timed out code is still merrily running in the background. I don't know if it's a problem in your case, but it's an important drawback. There should be a method to stop the thread though? I've never programmed thread stuff in python and wasn't able to find how to do it, would you happen to know how to kill the timed out thread? There is no way to kill a thread, other than set a flag and have the thread read it to realise the main thread wants it to stop. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Re: Cross-platform time out decorator
Steve Holden wrote: Joel wrote: On Sep 27, 4:36 pm, Hrvoje Niksic [EMAIL PROTECTED] wrote: Joel [EMAIL PROTECTED] writes: I found the solution : http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440569 describes a solution based on threads. I tested it and it works perfectly. Note that, unlike the original alarm code, it doesn't really interrupt the timed-out method, it just returns the control back to the caller, using an exception to mark that a timeout occurred. The timed out code is still merrily running in the background. I don't know if it's a problem in your case, but it's an important drawback. There should be a method to stop the thread though? I've never programmed thread stuff in python and wasn't able to find how to do it, would you happen to know how to kill the timed out thread? There is no way to kill a thread, other than set a flag and have the thread read it to realise the main thread wants it to stop. This is more-or-less why I suggested earlier that you wouldn't find anything straightforward. The signal mechanism, as far as I know, is pretty much unique in terms of the support it gets from the OS and the language combined. Any other solution will end up papering over cracks. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: os.removedirs - How to force this delete?
[EMAIL PROTECTED] wrote: I've been searching to find a way to force this delete to work even if the directory isn't empty. I've had no luck thus far. Anyone know what that would be? Answering your immediate question: you can't force os.removedirs to delete non-empty dirs. But shutil.rmtree(path, ignore_errors=True) does what you want. HTH, Marc -- http://mail.python.org/mailman/listinfo/python-list
Re: Pb with an AttributeError
Hi,
I m not sure what your trying to do, but this is where your problem is:
string1 is not a string it is actually a dict because of your eval.
When you call
string1[param] inside the string.split()
it is returning a dictionary and not a string
'param': {'key': 'SP136=', 'value': ['SD:0 ']}
since {'key': 'SP136=', 'value': ['SD:0 ']} is inside curly
brackets it is a dictionary.
I still dont get what your trying to have as your final result, but
hope this helps.
Thanks
Nathan
On 27/09/2007, Eric BOUVIER [EMAIL PROTECTED] wrote:
Hello,
First, sorry for my english.
I've just been assigned a project written in Python which contains bug(s).
I've never programmed in Python, but I've read the code
and understood basically what the different source codes do.
I've traced the code and found where the problem is but I don't
know how to solve the problem.
Here it is :
I've got a string issued from a CSV file :
string1 = eval(line[4])
print * string1 = (, string1 ,) \n
= * string1 = ( {'header': 'X-Score', 'param': {'key': 'SP136=',
'value': ['SD:0 ']} )
Then, there is a split with the equal :
TheParts = string.split(string1[param], =)
print * TheParts = (, TheParts ,) \n
But, running the program returns :
Traceback (most recent call last):
File C:\test\helper.py, line 136, in Action_handler
Score_eval(line, OutputFile_SP, This_Host)
File C:\test\helper.py, line 66, in Score_eval
TheParts = string.split(string1[param], =)
File C:\ActiveState\Python25\lib\string.py, line 290,
in split
return s.split(sep, maxsplit)
AttributeError: 'dict' object has no attribute 'split' !?!
I've found that it works when I put directly the string in the split
expression :
TheParts = string.split( {'key': 'ESP136=', 'value': ['SHA:0 ']} ,
=)
= * TheParts = [{'key': 'ESP136, ', 'value': ['SHA:0 ']}]
But the code isn't dynamic anymore !
I think it's a problem with the type, but the different syntax I've tried
didn't work.
Is somebody could help me ?
Thank you
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: Pb with an AttributeError
Did I just help someone with their homework? Hope not :S
On 27/09/2007, Nathan Harmston [EMAIL PROTECTED] wrote:
Hi,
I m not sure what your trying to do, but this is where your problem is:
string1 is not a string it is actually a dict because of your eval.
When you call
string1[param] inside the string.split()
it is returning a dictionary and not a string
'param': {'key': 'SP136=', 'value': ['SD:0 ']}
since {'key': 'SP136=', 'value': ['SD:0 ']} is inside curly
brackets it is a dictionary.
I still dont get what your trying to have as your final result, but
hope this helps.
Thanks
Nathan
On 27/09/2007, Eric BOUVIER [EMAIL PROTECTED] wrote:
Hello,
First, sorry for my english.
I've just been assigned a project written in Python which contains bug(s).
I've never programmed in Python, but I've read the code
and understood basically what the different source codes do.
I've traced the code and found where the problem is but I don't
know how to solve the problem.
Here it is :
I've got a string issued from a CSV file :
string1 = eval(line[4])
print * string1 = (, string1 ,) \n
= * string1 = ( {'header': 'X-Score', 'param': {'key': 'SP136=',
'value': ['SD:0 ']} )
Then, there is a split with the equal :
TheParts = string.split(string1[param], =)
print * TheParts = (, TheParts ,) \n
But, running the program returns :
Traceback (most recent call last):
File C:\test\helper.py, line 136, in Action_handler
Score_eval(line, OutputFile_SP, This_Host)
File C:\test\helper.py, line 66, in Score_eval
TheParts = string.split(string1[param], =)
File C:\ActiveState\Python25\lib\string.py, line 290,
in split
return s.split(sep, maxsplit)
AttributeError: 'dict' object has no attribute 'split' !?!
I've found that it works when I put directly the string in the split
expression :
TheParts = string.split( {'key': 'ESP136=', 'value': ['SHA:0 ']} ,
=)
= * TheParts = [{'key': 'ESP136, ', 'value': ['SHA:0 ']}]
But the code isn't dynamic anymore !
I think it's a problem with the type, but the different syntax I've tried
didn't work.
Is somebody could help me ?
Thank you
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Implement file download using python
Hello, I want to implement file downloads inside an authenticated web page, such that when a user clicks a link, the server side python code connects to a ftp server, downloads a relevant file and then streams the file to the browser for the user to open it with the appropriate application. In this case it will either be a pdf or a tiff file. This function is quite similar to something like writing raw bytes to a ServletOutputStream in java to be rendered directly to the user. It would be nice if someone can provide guidance, examples on how such a task may be accomplished using python. Thanks, Salil . -- http://mail.python.org/mailman/listinfo/python-list
True of False
I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Thanks. Kou -- http://mail.python.org/mailman/listinfo/python-list
ValueError: too many values to unpack,
I am trying to read a few lines of a file with multiple values, the rest are single and are reading in fine. With the multiple value lines, python says this ValueError: too many values to unpack I've googled it and it says that happens when you have too few or too many strings that don't match with the variables in number your trying to assign them too. Below are the lines in reading in: line 3 - 19.1829.1578.75212.10 line 4 - 10020410.29 And this is the code I'm using: #read withdrawls from file on line3 line = infile.readline() #split withdrawls up withdraw1, withdraw2, withdraw3, withdraw4 = string.split(line, \t) #read deposits from file on line4 line = infile.readline() #split deposits up deposit1, deposit2, deposit3 = string.split(line, \t) I have 4 strings to match line 3 and 3 to match the 3 on line 4...any thoughts? thx -- http://mail.python.org/mailman/listinfo/python-list
RE: Pb with an AttributeError
Thanks,
I find the type function and effectively the type is a dict.
I didn't know this type before ! :-}
The program normally try to get the value of SP between the
in the string1. Here, it's 136.
The string1 is normally longer and had a lot of value but only one
with value=.
I find str() and applied it to tranform the type 'dict' in a sting type.
Thus, I arrived to get 136 with regular expression.
Thanks
-Message d'origine-
De : Nathan Harmston [mailto:[EMAIL PROTECTED]
Envoyé : jeudi 27 septembre 2007 18:16
À : Eric BOUVIER
Cc : python-list@python.org
Objet : Re: Pb with an AttributeError
Hi,
I m not sure what your trying to do, but this is where your
problem is:
string1 is not a string it is actually a dict because of your eval.
When you call
string1[param] inside the string.split()
it is returning a dictionary and not a string
'param': {'key': 'SP136=', 'value': ['SD:0 ']}
since {'key': 'SP136=', 'value': ['SD:0 ']} is inside curly
brackets it is a dictionary.
I still dont get what your trying to have as your final result, but
hope this helps.
Thanks
Nathan
On 27/09/2007, Eric BOUVIER [EMAIL PROTECTED] wrote:
Hello,
First, sorry for my english.
I've just been assigned a project written in Python which
contains bug(s).
I've never programmed in Python, but I've read the code
and understood basically what the different source codes do.
I've traced the code and found where the problem is but I don't
know how to solve the problem.
Here it is :
I've got a string issued from a CSV file :
string1 = eval(line[4])
print * string1 = (, string1 ,) \n
= * string1 = ( {'header': 'X-Score', 'param':
{'key': 'SP136=',
'value': ['SD:0 ']} )
Then, there is a split with the equal :
TheParts = string.split(string1[param], =)
print * TheParts = (, TheParts ,) \n
But, running the program returns :
Traceback (most recent call last):
File C:\test\helper.py, line 136, in Action_handler
Score_eval(line, OutputFile_SP, This_Host)
File C:\test\helper.py, line 66, in Score_eval
TheParts = string.split(string1[param], =)
File C:\ActiveState\Python25\lib\string.py, line 290,
in split
return s.split(sep, maxsplit)
AttributeError: 'dict' object has no attribute 'split' !?!
I've found that it works when I put directly the string in the split
expression :
TheParts = string.split( {'key': 'ESP136=', 'value':
['SHA:0 ']} ,
=)
= * TheParts = [{'key': 'ESP136, ', 'value':
['SHA:0 ']}]
But the code isn't dynamic anymore !
I think it's a problem with the type, but the different
syntax I've tried
didn't work.
Is somebody could help me ?
Thank you
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: Implement file download using python
[EMAIL PROTECTED] wrote: Hello, I want to implement file downloads inside an authenticated web page, such that when a user clicks a link, the server side python code connects to a ftp server, downloads a relevant file and then streams the file to the browser for the user to open it with the appropriate application. In this case it will either be a pdf or a tiff file. This function is quite similar to something like writing raw bytes to a ServletOutputStream in java to be rendered directly to the user. It would be nice if someone can provide guidance, examples on how such a task may be accomplished using python. Fetching using ftplib is easy. But serving depends on what HTTP-server-environment you use. Please elaborate on that. Diez -- http://mail.python.org/mailman/listinfo/python-list
RE: making run time changes..
Hi, It seems that pyro provides remote access to object acting as middleware. My requirement is a bit different. It need not be remote. But I need to make run time changes at the running program, say changing it's functionality. More in lines of dynamic modules, but triggered by messages from outside. Regards, Piyush -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Holden Sent: Thursday, September 27, 2007 9:05 PM To: python-list@python.org Subject: Re: making run time changes.. Piyush Jain wrote: Hi, I am new(almost) to python. I wish to making a server in which I can make changes at run time. For example , add a method to a class/attribute to object etc. by sending it messages. Can anyone help me with what features to look into and how to go about it. Are there any similar projects? Take a look at Pyro (Python remote objects). It can almost certainly do what you want. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: ValueError: too many values to unpack,
On Thu, 27 Sep 2007 12:36:58 -0400, Shawn Minisall wrote: With the multiple value lines, python says this ValueError: too many values to unpack I've googled it and it says that happens when you have too few or too many strings that don't match with the variables in number your trying to assign them too. Below are the lines in reading in: line 3 - 19.1829.1578.75212.10 line 4 - 10020410.29 And this is the code I'm using: #read withdrawls from file on line3 line = infile.readline() #split withdrawls up withdraw1, withdraw2, withdraw3, withdraw4 = string.split(line, \t) #read deposits from file on line4 line = infile.readline() #split deposits up deposit1, deposit2, deposit3 = string.split(line, \t) I have 4 strings to match line 3 and 3 to match the 3 on line 4...any thoughts? First thought is to find out which of the two lines triggers the exception. This information is part of the full traceback. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
ValueError: too many values to unpack
I am trying to read a few lines of a file with multiple values, the rest are single and are reading in fine. With the multiple value lines, python says this ValueError: too many values to unpack I've googled it and it says that happens when you have too few or too many strings that don't match with the variables in number your trying to assign them too. Below are the lines in reading in: line 3 - 19.1829.1578.75212.10 line 4 - 10020410.29 And this is the code I'm using: #read withdrawls from file on line3 line = infile.readline() #split withdrawls up withdraw1, withdraw2, withdraw3, withdraw4 = string.split(line, \t) #read deposits from file on line4 line = infile.readline() #split deposits up deposit1, deposit2, deposit3 = string.split(line, \t) I have 4 strings to match line 3 and 3 to match the 3 on line 4...any thoughts? thx -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On 9/27/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Just use if c in a: and all will be well. The True object isn't the only truthy value in Python - see http://docs.python.org/lib/truth.html. -- Cheers, Simon B. [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Sep 27, 11:33 am, [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Thanks. Kou , You may want to include paren around (c in a) and a lower case p for Print, i.e. print, and it should work so eg: a = [a, b, c, d, e, f] if (c in a) == True: print Yes -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Thu, 27 Sep 2007 09:33:34 -0700, koutoo wrote:
I tried writing a true and false If statement and didn't get
anything? I read some previous posts, but I must be missing
something. I just tried something easy:
a = [a, b, c, d, e, f]
if c in a == True:
Print Yes
When I run this, it runs, but nothing prints. What am I doing wrong?
Wow that's odd:
In [265]: a = list('abcdef')
In [266]: a
Out[266]: ['a', 'b', 'c', 'd', 'e', 'f']
In [267]: 'c' in a
Out[267]: True
In [268]: 'c' in a == True
Out[268]: False
In [269]: ('c' in a) == True
Out[269]: True
In [270]: 'c' in (a == True)
---
type 'exceptions.TypeError' Traceback (most recent call last)
/home/bj/ipython console in module()
type 'exceptions.TypeError': argument of type 'bool' is not iterable
What's going on there?
Ciao,
Marc 'BlackJack' Rintsch
--
http://mail.python.org/mailman/listinfo/python-list
Re: True of False
[EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Thanks. Kou Hello, Just try : a = [a,b,c,d,e,f] if c in a: print yes That is going to work as the statement 'c in a' itself is true. You could try that by typing c in a at the interpreter. regards, Shriphani Palakodety -- http://mail.python.org/mailman/listinfo/python-list
Re: comparing elements of a list with a string
On Thu, 27 Sep 2007 08:16:59 -0400, Steve Holden wrote: Shriphani wrote: Hello, Would that mean that if I wanted to append all the (date, time) tuples to a list, I should do something like: for file in list_of_backup_files: some_list.append(file) That would be one way to do it (assuming you started with some_list as an empty list). But a faster way would be to use a list comprehension and say some_list = [f for f in list_of_backup_files] Or: some_list = list(list_of_backup_files) If `some_list` is not empty: some_list.extend(list_of_backup_files) Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Implement file download using python
On Sep 27, 11:39 am, Diez B. Roggisch [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Hello, I want to implement file downloads inside an authenticated web page, such that when a user clicks a link, the server side python code connects to a ftp server, downloads a relevant file and then streams the file to the browser for the user to open it with the appropriate application. In this case it will either be a pdf or a tiff file. This function is quite similar to something like writing raw bytes to a ServletOutputStream in java to be rendered directly to the user. It would be nice if someone can provide guidance, examples on how such a task may be accomplished using python. Fetching using ftplib is easy. But serving depends on what HTTP-server-environment you use. Please elaborate on that. Diez Thanks Diez for your reply. I am comfortable with using ftplib to fetch the file. As for the HTTP- server environment, I am using Apache 1.3 web server and python 2.1.3. Salil. Salil. -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Sep 27, 12:48 pm, Simon Brunning [EMAIL PROTECTED] wrote: On 9/27/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Just use if c in a: and all will be well. The True object isn't the only truthy value in Python - see http://docs.python.org/lib/truth.html. I would recommend the OP try this: run the (I)python shell and try the following: a = [x for x in abcdefg] a ['a','b','c','d','e','f','g'] c in a True c in a == True False (c in a) == True True The reason your conditional failed is that it was interpreted as c in (a == True) which is False. the == operator binds at a higher precedence level than the in operator, just as multiplication binds higher than addition -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
In [268]: 'c' in a == True
Out[268]: False
In [269]: ('c' in a) == True
Out[269]: True
In [270]: 'c' in (a == True)
---
type 'exceptions.TypeError' Traceback (most recent call
last)
/home/bj/ipython console in module()
type 'exceptions.TypeError': argument of type 'bool' is not iterable
What's going on there?
See http://docs.python.org/ref/comparisons.html
Comparisons can be chained arbitrarily, e.g., x y = z is equivalent
to x y and y = z, except that y is evaluated only once (but in both
cases z is not evaluated at all when x y is found to be false).
In exactly the same way:
'c' in a == True
is equivalent to:
'c' in a and a == True
which is False.
--
http://mail.python.org/mailman/listinfo/python-list
Re: True of False
[EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Thanks. You are unnecessarily adding a comparison with True. The correct way to write that is if c in a: print yes Bu of course you haven't actually told us what you really did, because the code you represent has syntax errors. a = [a, b, c, d, e, f] c in a True if c in a == True: ...print found it ... if (c in a) == True: ... print At last! ... At last! -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On 27/09/2007, Casey [EMAIL PROTECTED] wrote: On Sep 27, 12:48 pm, Simon Brunning [EMAIL PROTECTED] wrote: On 9/27/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Just use if c in a: and all will be well. The True object isn't the only truthy value in Python - see http://docs.python.org/lib/truth.html. I would recommend the OP try this: run the (I)python shell and try the following: a = [x for x in abcdefg] a ['a','b','c','d','e','f','g'] c in a True c in a == True False (c in a) == True True The reason your conditional failed is that it was interpreted as c in (a == True) which is False. the == operator binds at a higher precedence level than the in operator, just as multiplication binds higher than addition Actually it evaluates '(c in a) and (a == True)'. You can check like so: import dis a = list(abcdef) dis.dis(lambda: c in a == True) And just follow the bytecode operations. -- Richard. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Sep 27, 1:12 pm, Richard Thomas [EMAIL PROTECTED] wrote: On 27/09/2007, Casey [EMAIL PROTECTED] wrote: On Sep 27, 12:48 pm, Simon Brunning [EMAIL PROTECTED] wrote: On 9/27/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Just use if c in a: and all will be well. The True object isn't the only truthy value in Python - see http://docs.python.org/lib/truth.html. I would recommend the OP try this: run the (I)python shell and try the following: a = [x for x in abcdefg] a ['a','b','c','d','e','f','g'] c in a True c in a == True False (c in a) == True True The reason your conditional failed is that it was interpreted as c in (a == True) which is False. the == operator binds at a higher precedence level than the in operator, just as multiplication binds higher than addition Actually it evaluates '(c in a) and (a == True)'. You can check like so: import dis a = list(abcdef) dis.dis(lambda: c in a == True) And just follow the bytecode operations. -- Richard. -- http://mail.python.org/mailman/listinfo/python-list Doh, I forgot about operator chaining here. I'm so used to just seeing a b c that I forget about arbitrary operator chaining and think like a C++ programmer! -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Thu, 2007-09-27 at 16:47 +, Marc 'BlackJack' Rintsch wrote:
On Thu, 27 Sep 2007 09:33:34 -0700, koutoo wrote:
I tried writing a true and false If statement and didn't get
anything? I read some previous posts, but I must be missing
something. I just tried something easy:
a = [a, b, c, d, e, f]
if c in a == True:
Print Yes
When I run this, it runs, but nothing prints. What am I doing wrong?
Wow that's odd:
In [265]: a = list('abcdef')
In [266]: a
Out[266]: ['a', 'b', 'c', 'd', 'e', 'f']
In [267]: 'c' in a
Out[267]: True
In [268]: 'c' in a == True
Out[268]: False
In [269]: ('c' in a) == True
Out[269]: True
In [270]: 'c' in (a == True)
---
type 'exceptions.TypeError' Traceback (most recent call last)
/home/bj/ipython console in module()
type 'exceptions.TypeError': argument of type 'bool' is not iterable
What's going on there?
What's going on here is that both 'in' and '==' are comparison
operations, and Python allows you to chain comparisons. Just like a x
b is evaluated as a x and x b, 'c' in a == True is evaluated
as 'c' in a and a == True. Obviously, since a==True is false, the
chained comparison is False.
--
Carsten Haese
http://informixdb.sourceforge.net
--
http://mail.python.org/mailman/listinfo/python-list
getopt with negative numbers?
Is there an easy way to use getopt and still allow negative numbers as args? I can easily write a workaround (pre-process the tail end of the arguments, stripping off any non-options including negative numbers into a separate sequence and ignore the (now empty) args list returned by getopt, but it would seem this is such a common requirement that there would be an option to treat a negative value as an argument. Note that this is only a problem if the first non-option is a negative value, since getopt stops processing options as soon as it identifies the first argument value. Alternatively, does optparse handle this? I haven't used optparse (I know it is more powerful and OO, but you tend to stick with what you know, especially when it is part of my normal python programming template), but if it handles negative numbers I'm willing to learn it. -- http://mail.python.org/mailman/listinfo/python-list
Re: True of False
On Sep 27, 2007, at 11:47 AM, Marc 'BlackJack' Rintsch wrote:
On Thu, 27 Sep 2007 09:33:34 -0700, koutoo wrote:
I tried writing a true and false If statement and didn't get
anything? I read some previous posts, but I must be missing
something. I just tried something easy:
a = [a, b, c, d, e, f]
if c in a == True:
Print Yes
When I run this, it runs, but nothing prints. What am I doing wrong?
Wow that's odd:
In [265]: a = list('abcdef')
In [266]: a
Out[266]: ['a', 'b', 'c', 'd', 'e', 'f']
In [267]: 'c' in a
Out[267]: True
In [268]: 'c' in a == True
Out[268]: False
In [269]: ('c' in a) == True
Out[269]: True
In [270]: 'c' in (a == True)
--
-
type 'exceptions.TypeError' Traceback (most recent
call last)
/home/bj/ipython console in module()
type 'exceptions.TypeError': argument of type 'bool' is not iterable
What's going on there?
That is weird. Given 270, what's happening in 268.
Erik Jones
Software Developer | Emma®
[EMAIL PROTECTED]
800.595.4401 or 615.292.5888
615.292.0777 (fax)
Emma helps organizations everywhere communicate market in style.
Visit us online at http://www.myemma.com
--
http://mail.python.org/mailman/listinfo/python-list
Re: True of False
Richard Thomas wrote: On 27/09/2007, Casey [EMAIL PROTECTED] wrote: On Sep 27, 12:48 pm, Simon Brunning [EMAIL PROTECTED] wrote: On 9/27/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I tried writing a true and false If statement and didn't get anything? I read some previous posts, but I must be missing something. I just tried something easy: a = [a, b, c, d, e, f] if c in a == True: Print Yes When I run this, it runs, but nothing prints. What am I doing wrong? Just use if c in a: and all will be well. The True object isn't the only truthy value in Python - see http://docs.python.org/lib/truth.html. I would recommend the OP try this: run the (I)python shell and try the following: a = [x for x in abcdefg] a ['a','b','c','d','e','f','g'] c in a True c in a == True False (c in a) == True True The reason your conditional failed is that it was interpreted as c in (a == True) which is False. the == operator binds at a higher precedence level than the in operator, just as multiplication binds higher than addition Actually it evaluates '(c in a) and (a == True)'. You can check like so: import dis a = list(abcdef) dis.dis(lambda: c in a == True) And just follow the bytecode operations. Yikes. So I did that and you're correct. I've always looked at chained comparisons with mild suspicion. Now I guess that suspicion is justified. Interpreting abc as ab and bc make perfect sense to me, but interpreting c in a == True as (c in a) and (a == True) is not at all natural. Gary Herron -- Richard. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: getopt with negative numbers?
Casey wrote: Is there an easy way to use getopt and still allow negative numbers as args? I can easily write a workaround (pre-process the tail end of the arguments, stripping off any non-options including negative numbers into a separate sequence and ignore the (now empty) args list returned by getopt, but it would seem this is such a common requirement that there would be an option to treat a negative value as an argument. Note that this is only a problem if the first non-option is a negative value, since getopt stops processing options as soon as it identifies the first argument value. Alternatively, does optparse handle this? I haven't used optparse (I know it is more powerful and OO, but you tend to stick with what you know, especially when it is part of my normal python programming template), but if it handles negative numbers I'm willing to learn it. optparse can handle options with a negative int value; -- can be used to signal that no more options will follow: import optparse parser = optparse.OptionParser() parser.add_option(-a, type=int) Option at 0xb7d6fd8c: -a options, args = parser.parse_args([-a, -42, --, -123]) options.a -42 args ['-123'] Without the -- arg you will get an error: parser.parse_args([-123]) Usage: [options] : error: no such option: -1 $ Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: getopt with negative numbers?
On Sep 27, 1:34 pm, Peter Otten [EMAIL PROTECTED] wrote: optparse can handle options with a negative int value; -- can be used to signal that no more options will follow: Thanks, Peter. getopt supports the POSIX -- end of options indicator as well, but that seems a little less elegant than being able to simply set a value that tells the parser I don't use any numeric values as options, and I want to allow negative values as arguments. At the parser level implemening this would be trivial and I frankly was hoping it had been implemented and it just wasn't mentioned in the spares Python getopt library reference. -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I get the value out of a DOM Element
kj7ny wrote: Forgot to mention I'm using Python 2.4.3. You can install both lxml and ET on Python 2.4 (and 2.3). It's just that ET went into the stdlib from 2.5 on. Stefan -- http://mail.python.org/mailman/listinfo/python-list
