Toronto and Area Python Users Group (PyGTA) Meeting Tuesday, 7pm at the Linux Caffe
We will be holding our regular meeting at our regular time, on the Fourth Tuesday of the Month from 7pm to 9pm at the (very cool) Linux Caffe (located at the Corner of Grace and Harbord). We're going with small topical discussions (and/or lightning talks) this time around, with more socialising and mingling time to let you swap stories and experiences. Likely topics: * Upcoming 2.5 features (generator coroutines, ctypes, cElementTree) * DebugHang module for Twisted * FibraNet Those who would like to do a short (impromptu or prepared) talk on a topic, just drop me a note (or tell me at the meeting) and I'll try to get things put together for you (at the very least we should have a net-attached laptop with Linux and Python 2.4). For the presenters; this is a good opportunity to work on your presentation skills in front of a friendly and forgiving audience. For the audience; this is a good opportunity to work on being a friendly and forgiving audience :) . Map with instructions on reaching LinuxCaffe is available off the official next meeting page in the Wiki: http://web.engcorp.com/pygta/wiki/NextMeeting Have fun all, Mike -- Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Graphs from Python
Hi ! I want to create graphs (edges, nodes) from python. In the last project I used graph.py that create dot files - and then I can convert these dot files with ATT neato command line tool. But ATT code is instable, sometimes need to reinstalling, and it is use horizontal layouts. This cause the reports are unprintable (27 meter length), and jpeg export failed. Then I search for another solution. I see that GML language is very good, but I don't see any viewer for this except yEd. yEd is GUI app, so I cannot use for batch convert GML files to another format (SVG, JPEG, etc.). Is anybody have a solution to big graph creation ? Please help me ! Thanks for advance: dd -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Em Seg, 2006-03-27 às 23:02 -0800, alex23 escreveu: Felipe Almeida Lessa wrote: I said [constants defined in your code] can (maybe should?) be used with is, and AFAICT I'm right as well: b = a b is a True You should _never_ use 'is' to check for equivalence of value. Yes, due to the implementation of CPython the behaviour you quote above does occur, but it doesn't mean quite what you seem to think it does. /me not checking for value. I'm checking for identity. Suppose a is a constant. I want to check if b is the same constant. Try this: UPPERLIMIT = 100 i = 0 while not (i is UPPERLIMIT): i+=1 print i Comparing a changing variable to a pre-defined constant seems a lot more general a use case than sequential binding comparison...and as this should show, 'is' does _not_ catch these cases. That's *another* kind of constant. I gave you the example of socket.AF_UNIX, the kind of constant I'm talking about. Are you going to sequentially create numbers until you find it? Of couse not. The problem with Python (and other languages like Jave) is that we don't have a type like an enum (yet) so we have to define constants in our code. By doing an is instead of a == you *can* catch some errors. For example, a very dummy function (picked MSG_EOR as its value is greater than 99): --- from socket import MSG_EOR, MSG_WAITALL def test(type): if type is MSG_EOR: print This *is* MSG_EOR elif type == MSG_EOR: print This maybe be MSG_EOR else: print *Not MSG_EOR --- Now testing it: test(MSG_EOR) This *is* MSG_EOR Fine, but: print MSG_EOR 128 test(128) This maybe be MSG_EOR This is a mistake. Here I knew 128 == MSG_EOR, but what if that was a coincidence of some other function I created? I would *never* catch that bug as the function that tests for MSG_EOR expects any integer. By testing with is you test for *that* integer, the one defined on your module and that shouldn't go out of it anyway. Of course using an enum should make all said here obsolete. -- Felipe. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to inplement Session in CGI
Sullivan WxPyQtKinter wrote:
Python disappointly failed to provide a convinient cgi session
management module.
Probably because there are much better options for web programming in
Python ?
Not willing to use external modules, I would like to
implement a simplest Session object on my own.
The basic problem is: how could a python CGI program understand several
requests are in the same session?
Just like anyone else: by setting a session cookie. This is not related
to CGI, it's just how HTTP works.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
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Re: instantiate a class with a variable
John wrote:
Hi, is it possible to instantiate a class with a variable.
example
class foo:
def method(self):
pass
x='foo'
Can I use variable x value to create an instance of my class?
You got examples using string 'foo', now if all you need is to store or
pass around the class, just use it as any other object (yes, classes
*are* objects):
class Foo(object): pass
x = Foo
f = x()
assert type(f) is Foo
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: object references
DrConti wrote:
Hi Bruno, hi folks!
thank you very much for your advices.
I didn't know about the property function.
I learned also quite a lot now about references.
Ok everything is a reference but you can't get a reference of a
reference...
I saw a lot of variations on how to solve this problem, but I find
actually that the property approach is the most natural of all.
So I need to add a little correction to the code snippet (sorry, got
confused by your namings - ie 'ObjectClass' - and some recent
exploration I did about per-instance descriptors) : Actually, using a
property as an *instance* attribute won't work - unless the class
redefine __getattribute__ this way:
class ObjectClass(object):
def __getattribute__(self, name):
v = object.__getattribute__(self, name)
if not isinstance(v, types.FunctionType) \
and hasattr(v, '__get__'):
return v.__get__(self, self.__class__)
return v
Basically the idea there is that you build up this list of class
attributes
These are not *class* attributes, but *instance* attributes.
I think you should really take some time to learn more about Python's
object model, attribute lookup rules, descriptors and metaclasses.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: Graphs from Python
Metapost: http://cm.bell-labs.com/who/hobby/MetaPost.html Examples: http://tex.loria.fr/prod-graph/zoonekynd/metapost/metapost.html ImageMagick: http://www.imagemagick.org/script/index.php Metapost presupposes you know TeX/LaTeX. If you need help in converting metapost output to eps or pdf, let me know. Walter Kehowski -- http://mail.python.org/mailman/listinfo/python-list
Python VBR to CBR
Hi, I'm currently downloading podcasts using Juice, and I want to get them more easily transferred to my music player (Creative Zen). I'm currently writing something that will rename and alter the ID tags to be more friendly (in Python), but in the process, I'd like to convert from Variable Bit Rate to Constant Bit Rate. Is there a library for doing this, or alternatively, what would be the stages for converting from vbr to cbr and what python code is out there that can help? -- http://mail.python.org/mailman/listinfo/python-list
Re: Plone or TurboGears for Intranet
They are very different tools, apples and oranges. Plone is built for content management needs and TurboGears is built for general application development purposes. Both can work behind Apache but are not based on Apache. They use their own servers. Plone gives you a lot out of the box, but building Plone products, for your custom needs, has a steep learning curve to it. TurboGears is fairly simple to use and a good dev will probably take a day or so to get the hang of it. On the other hand, it will take as much time to learn to use Plone as an admin, let alone develop with it. There are several case studies for Plone on the web. Just Google for them. TurboGears won't have any since it is not officially production software yet. Personally, I don't take software case studies seriously. They are often too contextual, context that does not get adequately communicated in the document all too often. I would choose Plone to manage documents in the Intranet but stick to TurboGears (or some other framework - there are several good ones) for app development. -- http://mail.python.org/mailman/listinfo/python-list
Re: How do clients(web browser) close a python CGI program that is not responding?
Sullivan WxPyQtKinter wrote: Hi,there. Sometimes a python CGI script tries to output great quantities of HTML responce or in other cases, it just falls into a dead loop. How could my client close that CGI script running on the server? Generally speaking, remote users don't have control over your local processes, and if there is some problem with that local process that causes it to loop indefinitely, the chance that it could react appropriately to the browser is slim anyway. So the answer is to fix the problem with the CGI program. In addition, how could I configure that if a CGI program do not finish its task in 20sec or so, it will be automatically terminated? I suppose you could run it in a background thread or process, terminating it after the allotted time has expired, but I suspect you'd be better off addressing whatever is causing the problem in the first place. What sort of CGI program is this? -- Ben Sizer -- http://mail.python.org/mailman/listinfo/python-list
Converting Time question
Hello PythonPeople.. Can anybody help me out? How do I convert a time of day from milliseconds? For example: I got the following time in milliseconds: 1,090516451769E+15 And I want to print it like: 17:14:11.769 I'm on WinXP Time zone: GMT +01:00 Thank you all! -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
This does *not* also mean constants and such: snip a = 123456789 a == 123456789 True a is 123456789 False I didn't mean that kind of constant. I meant named constants with defined meaning, as in the example that I cooked up in my post. More examples: os.R_OK, or more complex ones like mymodule.DEFAULT_CONNECTION_CLASS. Sorry for causing unneccessary confusion. Cheers! /Joel Hedlund -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
You should _never_ use 'is' to check for equivalence of value. Yes, due to the implementation of CPython the behaviour you quote above does occur, but it doesn't mean quite what you seem to think it does. /me not checking for value. I'm checking for identity. Suppose a is a constant. I want to check if b is the same constant. /me too. That's what my example was all about. I was using identity to a known CONSTANT (in caps as per python naming conventions :-) to sidestep costly value equality computations. By doing an is instead of a == you *can* catch some errors. snip By testing with is you test for *that* integer, the one defined on your module and that shouldn't go out of it anyway. I totally agree with you on this point. Anything that helps guarding against stealthed errors is a good thing by my standards. Cheers! /Joel Hedlund -- http://mail.python.org/mailman/listinfo/python-list
Re: How do clients(web browser) close a python CGI program that is not responding?
In article [EMAIL PROTECTED], Sullivan WxPyQtKinter wrote: Hi,there. Sometimes a python CGI script tries to output great quantities of HTML responce or in other cases, it just falls into a dead loop. How could my client close that CGI script running on the server? I tried to use the STOP button in the web browser button, but it does not work. It depends on what CGI framework you're using. If the user hits 'stop', the client browser should close its connection and your web server should close the pipe to your CGI process. I'd expect you to get a SIGPIPE when next trying to output data. In addition, how could I configure that if a CGI program do not finish its task in 20sec or so, it will be automatically terminated? Do you mean a specific CGI, or all CGIs in general? If it's in general then you need to see if your web server can be configured to do that. If it's a specific CGI, check out signal.alarm() or resource.setrlimit(resource.RLIMIT_CPU, ...). Apache has a RLimitCPU directive, but be careful with it since it may well not do what you expect. -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Not those kind of constants, but this one: Python 2.4.2 (#2, Nov 20 2005, 17:04:48) [GCC 4.0.3 2005 (prerelease) (Debian 4.0.2-4)] on linux2 Type help, copyright, credits or license for more information. CONST = 123456789 a = CONST a == CONST True a is CONST True That's a little misleading, and goes back to the questions of what is assignment in Python? and What does it mean for an object to be mutable? The line a = CONST simply gives CONST a new name. After that, a is CONST will be True no matter what CONST was. Under some circumstances, I can even change CONST, and a is CONST will *still* be True. Anyone who thinks it's a good idea to change a CONST that's not in a module that they have full control over must really know what they're doing or suffer the consequences. Most often, the consequences will be nasty bugs. Cheers! /Joel Hedlund -- http://mail.python.org/mailman/listinfo/python-list
To run a python script in all the machines from one server
Hi Everyone I want to run a python script in all the machines that are connected through local network and collect the information about that machine such as HDD size, RAM capacity(with number of slots) ,processer speed etc. But i want to run a script from just the server, so that it should start scripts in all other machines, and get their local machines information and dump the same information in some FTP. Could you please let me know how can i do this?? Thanks Yogi -- http://mail.python.org/mailman/listinfo/python-list
Re: How to inplement Session in CGI
Sullivan WxPyQtKinter [EMAIL PROTECTED] (SW) wrote: SW Python disappointly failed to provide a convinient cgi session SW management module. Not willing to use external modules, I would like to SW implement a simplest Session object on my own. SW The basic problem is: how could a python CGI program understand several SW requests are in the same session? Definately, request from different IP SW would be easy to identified to be in different sessions, but request SW from the same IP would not. http://starship.python.net/~davem/cgifaq/faqw.cgi?req=showfile=faq02.011.htp or google for python cgi session for more. But why write it yourself if someone else has already done the work? -- Piet van Oostrum [EMAIL PROTECTED] URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4] Private email: [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
[EMAIL PROTECTED] wrote: Hi Everyone I want to run a python script in all the machines that are connected through local network and collect the information about that machine such as HDD size, RAM capacity(with number of slots) ,processer speed etc. But i want to run a script from just the server, so that it should start scripts in all other machines, and get their local machines information and dump the same information in some FTP. Could you please let me know how can i do this?? Thanks Yogi You could create a xmlrpc server on all clients, that listens for such a request, then your server (which is an xmlrpc client) calls all the clients on the appropriate exposed function, then the client proceeds on gathering the required information and puts it using ftplib on the ftp share. It is also possible to return all info via the xmlrpc call and let the server do the ftp part, all depends on your requirements. If your on a NT only network a better route would be to use WMI. -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
a is None is quicker than a == None I think it's not such a good idea to focus on speed gains here, since they really are marginal (max 2 seconds total after 1000 comparisons): import timeit print timeit.Timer(a == None, a = 1).timeit(int(1e7)) 4.19580316544 print timeit.Timer(a == None, a = None).timeit(int(1e7)) 3.20231699944 print timeit.Timer(a is None, a = 1).timeit(int(1e7)) 2.37486410141 print timeit.Timer(a is None, a = None).timeit(int(1e7)) 2.48372101784 Your observation is certainly correct, but I think it's better applied to more complex comparisons (say for example comparisons between gigantic objects or objects where value equality determination require a lot of nontrivial computations). That's where any real speed gains can be found. PEP8 tells me it's better style to write a is None and that's good enough for me. Otherwise I try to stay away from speed microoptimisations as much as possible since it generally results in less readable code, which in turn often results in an overall speed loss because code maintenance will be harder. Cheers! /Joel Hedlund -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
[EMAIL PROTECTED] wrote: Hi Everyone I want to run a python script in all the machines that are connected through local network and collect the information about that machine such as HDD size, RAM capacity(with number of slots) ,processer speed etc. But i want to run a script from just the server, so that it should start scripts in all other machines, and get their local machines information and dump the same information in some FTP. Could you please let me know how can i do this?? Thanks Yogi Take a look at: http://pybuild.sf.net/pyinvoke.html or http://rpyc.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
Link to Daily Python-URL from www.python.org?
Am I correct in thinking that there is no longer any link from anywhere on the Python Web site at http;//www.python.org to the Daily Python-URL at http://www.pythonware.com/daily/ ? There is no sign of it on the Community page, nor any reference to it at http://planet.python.org/ I'm sure there was a link to it last time I looked. Tim C -- http://mail.python.org/mailman/listinfo/python-list
Re: New Python logo in high resolution format
The new Python logo is available in high-resolution format here: http://tinyurl.com/n4rge Cheers, Brian -- http://mail.python.org/mailman/listinfo/python-list
Re: Python VBR to CBR
timsspamaddress wrote: I'm currently writing something that will rename and alter the ID tags to be more friendly (in Python), but in the process, I'd like to convert from Variable Bit Rate to Constant Bit Rate. Is there a library for doing this, or alternatively, what would be the stages for converting from vbr to cbr and what python code is out there that can help? It depends on the platform you are using - at least running Linux it would make sense to take a look at gstreamer, which is a pretty complete multimedia framework. Juding from a mp3/vorbis/flac player I wrote, its nice to use. HTH Matthias -- http://mail.python.org/mailman/listinfo/python-list
Re: New Python logo in high resolution format
Brian Quinlan wrote: The new Python logo is available in high-resolution format here: http://tinyurl.com/n4rge Cheers, Brian Thats the old logo, the new logo is at the same address but swap the last url segment from 'logo' to 'newlogo' There still isn't a 'usage' guide for the new logo but I'll get onto one soon hopefully. Tim Parkin -- http://mail.python.org/mailman/listinfo/python-list
Re: Link to Daily Python-URL from www.python.org?
Tim Churches wrote: Am I correct in thinking that there is no longer any link from anywhere on the Python Web site at http;//www.python.org to the Daily Python-URL at http://www.pythonware.com/daily/ ? There is no sign of it on the Community page, nor any reference to it at http://planet.python.org/ See http://www.python.org/links/ All links provided on that page would benefit from a short description. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting Time question
Me again.. I guess I ask it wrong.. I measure a time at racing events.this tracktime is measures in the format hh:mm:ssDDD where DDD = thousands of a second...like 17:14:11.769 This format is being saved as a number of micro seconds since 1970.. like 1,090516451769E+15 How do I convert from the micros seconds back to time format above? thanks again Hope someone can help me out.. Hello PythonPeople.. Can anybody help me out? How do I convert a time of day from milliseconds? For example: I got the following time in milliseconds: 1,090516451769E+15 And I want to print it like: 17:14:11.769 I'm on WinXP Time zone: GMT +01:00 Thank you all! -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: multiple assignment
Anand wrote:
Wouldn't it be nice to say
id, *tokens = line.split(',')
id, tokens_str = line.split(',', 1)
But then you have to split tokens_str again.
id, tokens_str = line.split(',', 1)
tokens = tokens_str.split(',')
this is too verbose.
head_tail = lambda seq: seq[0], seq[1:]
...
id, tokens = head_tail(line.split(','))
but I do like the syntax you're proposing !-)
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I want to run a python script in all the machines that are connected through local network and collect the information about that machine such as HDD size, RAM capacity(with number of slots) ,processer speed etc. But i want to run a script from just the server, so that it should start scripts in all other machines, and get their local machines information and dump the same information in some FTP. Could you please let me know how can i do this?? If these are unix machines then I would use ssh/scp. Use scp to copy the script to /tmp then run it and collect the output with ssh (and os.popen/subprocess) You can set ssh/scp up with keys too. Number of RAM slots is reasonably hard to obtain. You might want to investigate dmidecode for unix which queries the bios. It gives you stuff like this showing my machine has 4 slots, with 2x512 MB in. Handle 0x0007, DMI type 6, 12 bytes Memory Module Information Socket Designation: A0 Bank Connections: 1 2 Current Speed: Unknown Type: ECC DIMM SDRAM Installed Size: 512 MB (Double-bank Connection) Enabled Size: 512 MB (Double-bank Connection) Error Status: OK Handle 0x0008, DMI type 6, 12 bytes Memory Module Information Socket Designation: A1 Bank Connections: 3 4 Current Speed: Unknown Type: Unknown Installed Size: Not Installed Enabled Size: Not Installed Error Status: OK Handle 0x0009, DMI type 6, 12 bytes Memory Module Information Socket Designation: A2 Bank Connections: 5 6 Current Speed: Unknown Type: ECC DIMM SDRAM Installed Size: 512 MB (Double-bank Connection) Enabled Size: 512 MB (Double-bank Connection) Error Status: OK Handle 0x000A, DMI type 6, 12 bytes Memory Module Information Socket Designation: A3 Bank Connections: 7 8 Current Speed: Unknown Type: Unknown Installed Size: Not Installed Enabled Size: Not Installed Error Status: OK -- Nick Craig-Wood [EMAIL PROTECTED] -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting Time question
Math enlightened us with: How do I convert a time of day from milliseconds? Milliseconds since what? Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
Nick Craig-Wood enlightened us with: If these are unix machines then I would use ssh/scp. Use scp to copy the script to /tmp then run it and collect the output with ssh (and os.popen/subprocess) I'd use ssh only. Just give a 'cat /tmp/myscript.sh' command, then output the contents of the script, followed by CTRL+D. That also enables you to get the output directly (by giving the result of the script on stdout) instead of having to create an FTP server too. Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting Time question
Math enlightened us with: I measure a time at racing events.this tracktime is measures in the format hh:mm:ssDDD where DDD = thousands of a second...like 17:14:11.769 This format is being saved as a number of micro seconds since 1970.. like 1,090516451769E+15 How do I convert from the micros seconds back to time format above? Use the datetime.datetime.fromtimestamp() function, after dividing the number of milliseconds by 1000 to create seconds. Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa -- http://mail.python.org/mailman/listinfo/python-list
Re: doctest, unittest, or if __name__='__main__'
In article [EMAIL PROTECTED], Paul Rubin http://[EMAIL PROTECTED] wrote: [EMAIL PROTECTED] [EMAIL PROTECTED] writes: I have noticed some distinctly funny and confused feelings I get when using the unittest module, stuff that feels clunky and odd about how it is set-up, however I thought that this was just due to *my personal* lack of understanding of the deep magic and sophisticated design patterns used in this module! If it turns out to be 'unpythonic' The unpythonicness stems from it being basically a reimplementation of JUnit, which was designed for use with Java. JUnit, in turn, is based on a package first implemented in SmallTalk (http://www.xprogramming.com/testfram.htm). On stuff like this, I'm not opposed to things being slightly unpythonic. PyUnit does have some clunkyness to it, but there is some value in having all the unit test frameworks have a similar feel across languages. Unfortunately, it has become fashionable to call any sort of unit test framework xxxUnit, whether or not it resembles the original or not. -- http://mail.python.org/mailman/listinfo/python-list
Re: problems with looping, i suppose
John Salerno [EMAIL PROTECTED] wrote: Does what I originally pasted in my message look incorrect? To me, it all seems indented properly. Yes. Somewhere or other you've got your tabstop set to 4, and python treats literal tabs as being of equivalent indent to 8 spaces. As does my newsreader, so the problem was obvious: while True: tries += 1 ^ This was a tab (my cutpaste has turned it back into spaces) try: ^ This was a tab too. if guess == number: This was eight spaces even before I cutpasted. -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ ___ | Frankly I have no feelings towards penguins one way or the other \X/ |-- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Re: New development windows, IronPython or PythonWin
Dan wrote: Just starting to do some windows Client / Server programming. Which would you recommend? I need to create a server to fire events and communicate with clients over a lan. Thanks There are plenty of Python solutions for this, most of them work with Windows, but aren't locked to it. You might want to look at one of these: http://pyro.sourceforge.net/ http://dabodev.com/ See also http://wiki.python.org/moin/DistributedProgramming and http://www.thinkware.se/cgi-bin/thinki.cgi/UsingPythonWithOtherLanguages -- http://mail.python.org/mailman/listinfo/python-list
Re: Suggestion for Web App
Harlin Seritt wrote: I want to make a recommendation to a group of internal customers where I work concerning a Python web framework. They are seeking to build a portal that can handle around 5000 total users but probably no more than 100-200 simultaneous users. This is supposed to serve mainly static content - the content will hold references, tutorials and examples for different technologies, a forum (similar probably to phpbb) and podcasts (rss and mp3 files). Also I believe it will definitely need a decent DB server for this. They have some other suggestions ranging from Websphere/JSP's to PHP. I personally don't think the PHP will scale well for growth and I also think that using Java/JSPs will be too slow for this sort of thing. There are certainly big PHP sites (Wikipedia?) and I'm not sure Python is faster than Java/JSP (given enough memory on the server). I'd use Python too, but that's more due to maintainablility and rapid development than performance. I normally work as system and application admin and use Python in a number of ways to get the job done. Naturally, I am naturally inclined to suggest something that uses Python or something Pythonic. I wanted to suggest Zope but there are also other ones I'm thinking of as well like CherryPy and Karrigell. Which one of these (or other ones you guys know of) would do the best job in this situation? I never felt Zope was very pythonic... You certainly get a lot out of the box with Zope, but there seems to be a big learning curve as soon as you go beyond the most obvious things. Knowing Python won't mean that you feel at home in Zope. Zope 3 seems to improve things, but almost all existing Zope products today are Zope 2 thingies, so it seems a year early or so to jump onto the Zope 3 train if you don't want a lot of work. It seems the popular tool kits these days are Django and Turbo Gears. I have heard a lot of good things about both. I think both have video tutorials and other introduction docs that are easy to digest. Also do you guys know if MySQL would work with this or should they use something more robust like DB2 (IBM shop)? Typically, I warn people about MySQL, since it's not very mature in the role as a full RDBMS, but it's been very successful for use as container for web site content. This role, with lots of simple reads, no complex transactions and relatively few updates is just where MySQL shines. Don't use it for mission critical OLTP applications such as booking or accounting systems though. I think MySQL is robust. -- http://mail.python.org/mailman/listinfo/python-list
Re: embed notepad into a frame widget
Matt wrote: all, trying to load an application (notepad for instance) and have it sit inside a Python application window. When the main window maximises or minimises, the (notepad) app follows. I am pretty sure I need to use a frame widget under tkinter (win32) but not exactly sure how to do it. You are pretty wrong being sure :) Under windows, it is indeed possible to embed certain applications into others - the related technical term is conveniently called OLE (Object lining and embedding). But the application has to be prepared for doing so - and this is deep windows stuff, so I guess you can't do that with Tkinter. Another technique is to use so-called activex-controls. The IEfor instance is available as such a control. But that also isn't doable with Tkinter (AFAIK, I'm not totally sure on that). But wxPython can: http://www.wxpython.org/MigrationGuide.html Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Joel Hedlund wrote: This does *not* also mean constants and such: snip a = 123456789 a == 123456789 True a is 123456789 False I didn't mean that kind of constant. I meant named constants with defined meaning, as in the example that I cooked up in my post. More examples: os.R_OK, or more complex ones like mymodule.DEFAULT_CONNECTION_CLASS. If it weren't for the current CPython optimization (caching small integers) this code which it appears you would support writing, would fail: if (flags os.R_OK) is os.R_OK: # do something while this, on the other hand, is not buggy, because it correctly uses equality comparison when identity comparison is not called for: if (flags os.R_OK) == os.R_OK: # do something (I think you should give it up... you're trying to push a rope.) -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: What's the best way to learn perl for a python programmer?
vj wrote: I've been given a project which requires writing scripts that need to be run on over 3000 servers. Only about 15% of them have python installed on them. While all/most of them will have perl. I'll try and do as much as possible in pexpect but am sure I'll have do some significant perl. Any suggestions on what is the best way to get upto speed on perl? The thing that really bit me when I tried to go back to Perl after years with Python was dereferencing. Completely obvious things in Python, such as extracting an element from a list inside a dict in another list felt like black magic. I actually gave up, but later I realized that there is an entire chapter in Programming Perl about the stumbling blocks with dereferencing in Perl. I don't think people in this group :) will disagree if I claim that Python software is much more maintainable and easier to develop and debug than Perl scripts. That's probably relevant if they are to run on thousands of servers. I'd make a real effort to investigate if it's possible to either install Python on all boxes or use something like cx_Freeze to make executables out of the scripts. -- http://mail.python.org/mailman/listinfo/python-list
in-place string reversal
How would you reverse a string in place in python? I am seeing that there are a lot of operations around higher level data structures and less emphasis on primitive data. I am a little lost and can't find my way through seeing a rev() or a reverse() or a strRev() function around a string object. I could traverse from end-to-beginning by using extra memory: strText = foo strTemp = for chr in strText: strTemp = chr + strTemp but how would I do it in place? Forget it! I got the answer to my own question. Strings are immutable, *even* in python. Why not! The python compiler is written in C, right? It is amazing how just writing down your problem can give you a solution. PS: Or, if my assumption that strings are immutable and an in-place reversal is possible, is wrong, please correct me. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to inplement Session in CGI
Sullivan WxPyQtKinter wrote: Python disappointly failed to provide a convinient cgi session management module. Not willing to use external modules, I would like to implement a simplest Session object on my own. The basic problem is: how could a python CGI program understand several requests are in the same session? Definately, request from different IP would be easy to identified to be in different sessions, but request from the same IP would not. Anyone has any idea? Maybe you could get over your irrational fear of external modules just long enough to download one or two and examine them, to learn how they do it. Then you could answer your own question... -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
And that the extra-memory operation I've given above is expensive, I believe. Is there an efficient way to do it? -- http://mail.python.org/mailman/listinfo/python-list
String split
Hello ng, I don't understand why split (string split) doesn't work with the same method if I can't pass values or if I pass a whitespace value: .split() [] .split( ) [''] But into the doc I see: If sep is not specified or is None, any whitespace string is a separator. In this two cases, split would to return the _same_ result? Thanks, Michele -- http://mail.python.org/mailman/listinfo/python-list
Re: Nevow LivePage tutorial
On 27 Mar 2006 23:00:56 -0800, Mir Nazim [EMAIL PROTECTED] wrote: I really appriciate the help a lot, the but the problems is that i have already real those. What i was looking for was some kind of detailed tutorial, that explains the basic ideas about live page and formhandling etc. (my be it the time some nevow know guy got onto it) You might want to ask on the twisted web mailing list, then. http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-web Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Sathyaish enlightened us with: How would you reverse a string in place in python? You wouldn't, since strings are immutable. Forget it! I got the answer to my own question. Strings are immutable, *even* in python. Indeed :) Why not! The python compiler is written in C, right? Yup. But what's got that to do with it? Strings are very mutable in C. It is amazing how just writing down your problem can give you a solution. :) Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa -- http://mail.python.org/mailman/listinfo/python-list
Quick Question regarding Frames
Hello All, Just starting out with Python and wxPython. I have two Frames, FrameA and FrameB. FrameA opens FrameB when a button on FrameA is clicked. I can get this. Now I want a button on FrameB to update a control on FrameA. I am having an issue with this. Can anyone point me in the right direction? Thanks. Chris -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
On 28 Mar 2006 06:08:51 -0800, Sathyaish [EMAIL PROTECTED] wrote: How would you reverse a string in place in python? I am seeing that there are a lot of operations around higher level data structures and less emphasis on primitive data. I am a little lost and can't find my way through seeing a rev() or a reverse() or a strRev() function around a string object. I could traverse from end-to-beginning by using extra memory: strText = foo strTemp = for chr in strText: strTemp = chr + strTemp This is much slower than strText[::-1] (or any other squence), but which also isn't in-place. In-place operations on strings aren't support. You may want to consider a different datatype if this is important. For example, an array of characters. Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
1.090516455488E9 / 1000000.000 ???
Hello, I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 I know something with float and //... Anybody? How do I get correct number? -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Sathyaish wrote: And that the extra-memory operation I've given above is expensive, I believe. Is there an efficient way to do it? If i recall correctly a string is an immutable list. I would do it this way: strTXT = foo strREV = strTXT[::-1] strREV 'oof' -- mph -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
But what's got that to do with it? Strings are very mutable in C. I realized after posting that I'd said something incorrect again. The concept of mutability itself is a high-level concept compared to C. Memory allocation for strings is expensive because of the way malloc() works to find a best-fit against a first-fit in traditional memory management systems. Because of the performance hit, high level languages and frameworks, such as the Common Type System of the .NET Framework for example, considers strings as immutable. That, unlike Python, doesn't however, make them impossible to modify in-place. -- http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
Should be 1.090516455488E15 - Original Message - From: Math [EMAIL PROTECTED] To: python-list@python.org Sent: Tuesday, March 28, 2006 4:29 PM Subject: 1.090516455488E9 / 100.000 ??? Hello, I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 I know something with float and //... Anybody? How do I get correct number? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Converting Time question
Math [EMAIL PROTECTED] wrote:
I measure a time at racing events.this tracktime is measures in the format
hh:mm:ssDDD
where DDD = thousands of a second...like 17:14:11.769
This format is being saved as a number of micro seconds since 1970..
like 1,090516451769E+15
How do I convert from the micros seconds back to time format above?
This is probably what you want
import datetime
t=datetime.datetime.fromtimestamp(1.090516451769E+15/1E6)
t
datetime.datetime(2004, 7, 22, 18, 14, 11, 769000)
t.isoformat()
'2004-07-22T18:14:11.769000'
t.isoformat(' ').split()[1]
'18:14:11.769000'
Note that this converts using the PCs time zone (hence it says 18:14
not 17:14). You can pass your own timezone in (but it isn't easy!),
or you can use utcfromtimestamp()
datetime.datetime.utcfromtimestamp(1.090516451769E+15/1E6).isoformat()[-15:]
'17:14:11.769000'
--
Nick Craig-Wood [EMAIL PROTECTED] -- http://www.craig-wood.com/nick
--
http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
1.090516455488E9 / 100 1090.516455488 -- http://mail.python.org/mailman/listinfo/python-list
Re: Quick Question regarding Frames
A little further clarification. FrameA and FrameB are in different modules. Thanks. Chris -- http://mail.python.org/mailman/listinfo/python-list
Threads and sys.excepthook
Hello guys, I have this problem and i don't know any workarounds yet. Im implementing a DB Connection pool, which initially creates 20 connections and keep them in a dictionary. It also implements a method for allowing external method/classes to get a connection from that pool. he main issue is that, from a testing app, I create a loop like this to test the pool: import thread import sys import seen #this is my module DB = seen.DBManager() def test(name): try : idc,conn = DB.get_conn() print Thread: ,name, -- ,DB, ID: ,idc except : print sys.exc_info()[0] print sys.exc_info()[1] print ERROR IN HERE return for i in xrange(20) : try: name = 'THREAD' + str(i)except: thread.start_new(test, (name,)) #(1) except: print 'An Exception Ocurred' print sys.exc_info()[0] print sys.exc_info()[1] But when i run this code, The code works fine the first 5 times. the rest, all i get is this: SIZE: 20 Thread: THREAD0 -- seen.DBManager object at 0x403ca7ec ID: 0 SIZE: 19 Unhandled exception in thread started by Error in sys.excepthook: Original exception was: Unhandled exception in thread started by Error in sys.excepthook: Original exception was: Unhandled exception in thread started by Error in sys.excepthook: Original exception was: Unhandled exception in thread started by Error in sys.excepthook: Original exception was: And if put a time.sleep(1) after the thread.start_new(test, (name,)) #(1) part, then it does it all perfectly. I dont know what is causing the problem, maybe the threads are spawning too fast? OS issues?? python issues?? Im running Gentoo GNU/Linux and Python2.4 Thanks in advance, Jesús Rivero - (Neurogeek) -- http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
Math wrote: Hello, I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 I know something with float and //... Anybody? How do I get correct number? Python 2.4.2 (#1, Mar 12 2006, 00:14:41) [GCC 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0, pie-8.7.9)] on linux2 Type help, copyright, credits or license for more information. 1.090516455488E15 / 100 1090516455.487 print 1.090516455488E15 / 100 1090516455.49 print is using str() which formats the float number with 12 digits precision and therefore rounds the result. repr() however, which is used by the interpreter when printing out expression results, uses 17 digits precision which is why you can see how the result is stored in the computer's memory (1090516455.487). Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
Math wrote: I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 assuming you meant ~1090, it is: 1.090516455488E9 / 100 1090.516455488 unless you round it off to 12 significant digits, which is what str() does: str(1.090516455488E9 / 100) '1090.51645549' on the other hand, if you meant E15 instead, you get another problem: 1.090516455488E15 / 100 1090516455.487 # oops! str(1.090516455488E15 / 100) '1090516455.49' the reason is of course that floating point are stored as a limited number of base 2-digits internally. what you get when you con- vert that back to decimal depends on the resulting number itself, not on the number of significant digits you used on the original expression. for more on this topic, see http://docs.python.org/tut/node16.html and consider using http://www.python.org/doc/lib/module-decimal.html instead. I know something with float and //... if you know how floats work, how come you're surprised by rounding issues ? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: String split
Michele Petrazzo wrote:
Hello ng,
I don't understand why split (string split) doesn't work with the same
method if I can't pass values or if I pass a whitespace value:
.split()
[]
.split( )
['']
But into the doc I see:
If sep is not specified or is None, any whitespace string is a
separator.
The documentation for Python 2.4 has a better explanation.
split([sep [,maxsplit]])
Return a list of the words in the string, using sep as the delimiter string.
If maxsplit is given, at most maxsplit splits are done. (thus, the list
will have at most maxsplit+1 elements). If maxsplit is not specified, then
there is no limit on the number of splits (all possible splits are made).
Consecutive delimiters are not grouped together and are deemed to delimit
empty strings (for example, '1,,2'.split(',')returns ['1', '', '2']).
The sep argument may consist of multiple characters (for example, '1, 2,
3'.split(', ') returns ['1', '2', '3']). Splitting an empty string with
a specified separator returns [''].
If sep is not specified or is None, a different splitting algorithm is
applied. First, whitespace characters (spaces, tabs, newlines, returns, and
formfeeds) are stripped from both ends. Then, words are separated by
arbitrary length strings of whitespace characters. Consecutive whitespace
delimiters are treated as a single delimiter ('1 2 3'.split() returns
['1', '2', '3']). Splitting an empty string or a string consisting of
just whitespace returns an empty list.
Quoted after http://docs.python.org/lib/string-methods.html#l2h-202.
Peter
--
http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Sathyaish [EMAIL PROTECTED] wrote: How would you reverse a string in place in python? [ ... ] Forget it! I got the answer to my own question. Strings are immutable, *even* in python. I'm not sure what that *even* is about, but glad that You can't, strings are immutable is a satisfactory answer. Rather than writing your own reversing code, you might like to look at: .join(reversed(foo)) -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ ___ | Frankly I have no feelings towards penguins one way or the other \X/ |-- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Problem with httplib and HEAD request
Hi - I'm writing some Python code to interact with Amazon's S3 service. One feature of S3 is that it will allow you to use the HTTP HEAD request to retrieve metadata about an S3 object without actually retrieving the content of the object. In trying to use this feature, I'm running into what I think is a bug in httplib.py. If the resource I perform the HEAD request on exists within S3 then everything is fine. If, however, the resource doesn't exist then a 404 is returned. If the request had been a GET rather than a HEAD the body of the response would be some XML that gave further information about the error status returned. However, for a HEAD request no body can be returned so the body is empty. The error response, for either HEAD or GET, does include the following header: transfer-encoding: chunked And this seems to be causing confusion in httplib.py. I have to call the read method of the response or else I get a ResponseNotReady exception on my next request. When I attempt to read the body of the error response to the HEAD request it is passed onto the _read_chunked method where it immediately tries to do a readline() on the connection which, of course, hangs because no body has been sent in the response. So, I know this is kind of a boundary condition and perhaps it hasn't come up before but it seems that the behavior of httplib is incorrect. I think something needs to be added to the _read_chunked method which checks if the request is a GET and, if so, just reads zero bytes from the socket and returns. Any comments? Thanks, Mitch -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Sathyaish wrote: But what's got that to do with it? Strings are very mutable in C. I realized after posting that I'd said something incorrect again. The concept of mutability itself is a high-level concept compared to C. Memory allocation for strings is expensive because of the way malloc() works to find a best-fit against a first-fit in traditional memory management systems. Because of the performance hit, high level languages and frameworks, such as the Common Type System of the .NET Framework for example, considers strings as immutable. That, unlike Python, doesn't however, make them impossible to modify in-place. I believe part of the reason for their immutability is so that they can be used as dictionary keys, which is a very common use. -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
Nick Craig-Wood wrote: If these are unix machines then I would use ssh/scp. Even if they are Windows PCs, you could just install cygwin, openssh, and python. -- http://mail.python.org/mailman/listinfo/python-list
Re: String split
Michele Petrazzo wrote: I don't understand why split (string split) doesn't work with the same method if I can't pass values or if I pass a whitespace value: .split() [] .split( ) [''] But into the doc I see: If sep is not specified or is None, any whitespace string is a separator. In this two cases, split would to return the _same_ result? split(None) strips the string before splitting it (on runs of whitespace, not on individual whitespace characters). see the library reference for a complete description: http://docs.python.org/lib/string-methods.html /F -- http://mail.python.org/mailman/listinfo/python-list
Dr. Dobb's Python-URL! - weekly Python news and links (Mar 27)
QOTW: Testing real examples in doctstrings, or external documentation like tutorials, is important because it's very frustrating for people reading the docs if the examples don't work as advertised. - Marc Rintsch If you don't document what the sundry variables are FOR, you're really not documenting your code at all -- just listing the names of some attributes is far too weak. - Alex Martelli If unittest is the standard way to write testing code, why do we still have doctest? Because serious testers use both. http://groups.google.com/group/comp.lang.python/browse_frm/thread/b49d428f5c47f728/9f2348ceaf88d5a5?tvc=1 Coincidentally, Terry Hancock dedicates a large portion of his report from PyCON 2006 to the power and simplicity of doctest. http://blog.freesoftwaremagazine.com/users/t.hancock/2006/03/18/title_3 Do you have any recipes that you find indispensable in your daily work but that are not obvious to a beginner? Contribute them to Aahz' collection. http://groups.google.com/group/comp.lang.python/browse_frm/thread/8b752d91a7b83140/3dee683b0daa700b?tvc=1 When using eval() is too dangerous you may still be able to facilitate Python's parsing infrastructure as Michael Spencer shows: http://groups.google.com/group/comp.lang.python/browse_frm/thread/789f2c8f7196e6e5/5c7a4f8438ec948c?tvc=1 Want to squeeze your precious unicode data into ASCII strings? FLundh's solution builds on character decomposition and unicode.translate()'s ability to replace one character with many. http://groups.google.com/group/comp.lang.python/msg/77196f64a90ea9bc Andrew Dalke explores the performance implications of various approaches to class instantiation and has collected a few quotes on the __slots__ feature. http://www.dalkescientific.com/writings/diary/archive/2006/03/19/class_instantiation_performance.html Andrew Clover has derived nice Windows Icons from the new Python logo. http://groups.google.com/group/comp.lang.python/msg/0ad44c95e81b93cb The mythical Python 3000 is mythical no more as you can watch it evolve on its own mailing list. Rumour has it that there is also a branch in subversion, only slighly obfuscated by its name. http://mail.python.org/pipermail/python-3000/2006-March/thread.html Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Mygale is a news-gathering webcrawler that specializes in (new) World-Wide Web articles related to Python. http://www.awaretek.com/nowak/mygale.html While cosmetically similar, Mygale and the Daily Python-URL are utterly different in their technologies and generally in their results. For far, FAR more Python reading than any one mind should absorb, much of it quite interesting, several pages index much of the universe of Pybloggers. http://lowlife.jp/cgi-bin/moin.cgi/PythonProgrammersWeblog http://www.planetpython.org/ http://mechanicalcat.net/pyblagg.html comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/groups?oi=djqas_ugroup=comp.lang.python.announce Steve Bethard, Tim Lesher, and Tony Meyer continue the marvelous tradition early borne by Andrew Kuchling, Michael Hudson and Brett Cannon of intelligently summarizing action on the python-dev mailing list once every other week. http://www.python.org/dev/summary/ The Python Package Index catalogues packages. http://www.python.org/pypi/ The somewhat older Vaults of Parnassus ambitiously collects references to all sorts of Python resources. http://www.vex.net/~x/parnassus/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ Python Success Stories--from air-traffic control to on-line match-making--can inspire you or decision-makers to whom you're subject with a vision of what the language makes practical. http://www.pythonology.com/success The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for Python's development and maintenance. http://www.python.org/psf/ Among the ways you can support PSF is with a donation. http://www.python.org/psf/donate.html Kurt B. Kaiser publishes a weekly report on
Re: Plone or TurboGears for Intranet
[EMAIL PROTECTED] wrote: Hi all, Just wondering which technology would best suit the development of custom intranets in general, things that may be industry specific would need to be included (say for an industrial design company the addition of internal memos and even extrememly business specific apps such as simple inventory control reporting). The other big issue is ease of templating as the only Plone examples I've seen have seemed to basically use the original template or a slightly customised version of it so I'm wondering whether it would be quicker to build it from the ground up with TurboGears. Any thoughts on the matter are greatly appreciated and any examples of EITHER used extensively in case studies or the like would be fantastic! Thanks in advance! For custom applications, you'd be better off looking at Plone's underlying Zope app server. As an alternative to TG, you may want to consider Django. Memos and non-database apps would probably be okay with just Plone. In fact, for memos, design notes, developer documentation, you'd be best off considering a collaborative editing solution such as Wiki (of which there are numerous variants in any programming language you want). Though some may suggest a single system to fit all needs, unless you require tight integration (e.g. memos reflect real-time inventory information), you'd probably do well deploying them as separate best of breed applications. You can customize the UI to make the differences less apparent. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's the best way to learn perl for a python programmer?
Magnus Lycka [EMAIL PROTECTED] wrote: The thing that really bit me when I tried to go back to Perl after years with Python was dereferencing. Completely obvious things in Python, such as extracting an element from a list inside a dict in another list felt like black magic. Not that long ago I had to make some enhancements to someone else's Perl script which was handling that kind of data structure. I stared and stared at a particularly long and messy dereference, and eventually figured out what it was doing. I then wrote what the equivalent Python would have been. Even forgiving the Perl's initial my, thanks to the line noise characters the Python was over 10% shorter, as well as more readable. So much for the myth of verbosity. -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ ___ | Frankly I have no feelings towards penguins one way or the other \X/ |-- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Looking for a language/framework
Way back when, I got a lot of training and experience in highly structued software development. These days, I dabble with web-development, but I may become more serious. I consider php to be an abombination, the backward compatibility issues alone are reason enough to make me hate it. Rail looks promising, but it's difficult to find inexpensive hosting that supports rails. I like python much better, but I'm not certain it's as well suited for web developement. I'm not sure how th e apache module thing works. I am using shared hosting, they provide python, but I'm not sure how limited I'll be. Ideally, I would like to be able to develop a database driven web-app, in much the same manner as I could develop an ms-access app. As much as I dislike msft, I have to admit, an ms-access app can be put together quickly, without any steep learning curve. I've been looking at python web frameworks, and I'm not sure what to think. It seems like these frameworks would allow me to do a lot of work, with a small amount of code, but the learning curve seems very steep. I wouldn't even mind the steep learning curves, so much, except, it seems to me that anything developed with one framework, would not work with another. So if I changed my mind about which framework, I'd have to start all over again - re-learning everything, re-writing everything. Of course, everybody says their framework is the best. But how can I know for sure? I don't have time to try them all. -- http://mail.python.org/mailman/listinfo/python-list
Re: doctest, unittest, or if __name__='__main__'
Paul The unpythonicness stems from it being basically a Paul reimplementation of JUnit, which was designed for use with Java. I think there are a few modules in Python which suffer that affliction. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
Yogi I want to run a python script in all the machines that are Yogi connected through local network and collect the information about Yogi that machine such as HDD size, RAM capacity(with number of slots) Yogi ,processer speed etc. Yogi But i want to run a script from just the server, so that it should Yogi start scripts in all other machines, and get their local machines Yogi information and dump the same information in some FTP. Yogi Could you please let me know how can i do this?? Take a look at Nagios and plugins line nrpe. Skip -- http://mail.python.org/mailman/listinfo/python-list
Perforce p4c.run(print error - AttributeError: OutputBinary
Hi all,
I am getting an error message when trying to use the P4 print command
via the python api for perforce.
Anytime that I run p4c.run(print,-q, eachFile), I keep getting an
error message: AttributeError: OutputBinary.
Here is my code below: Please Help.
import p4
#import perforce module
#For complete API see
http://public.perforce.com/guest/robert_cowham/perforce/API/python/index.html
p4c = p4.P4()
p4c.port = perforce.ic.ncs.com:1424
p4c.user = perrk9
p4c.parse_forms()
p4c.connect()
path = //practice/perrk9/...
localTemp = c:\perforce_temp_dir\\
first = p4c.run( counter, galloway_deploy )[0]
# here 'last_change_record' is a dictionary
last_change_record = p4c.run( changes, -m, 1, path )[0]
print last change record
print last_change_record
last = last_change_record['change']
print last \n
print last
status_dict = { right only :add, left only :delete, content
:edit, identical :no change }
result = p4c.run( diff2, -q, path + @ + first , path + @ + last
)
# result is an Array, each element is a Dictionary
#Find out which files were add/edited/deleted and throw them into lists
deploy = [] # add/edit list
undeploy = [] # delete list
for changed_file in result:
action = status_dict[ changed_file['status'] ]
print action
if ((action =='add') or (action == 'edit')):
print Changed file =
print changed_file['depotFile']
deploy.append(changed_file['depotFile']) #appending each file to our
'deploy' list
elif action == delete:
undeploy.append(changed_file['depotFile']) #appending each file to
our 'undeploy' list
#print the deploy list
print deploy list
print deploy
for eachFile in deploy :
print eachFile
file = p4c.run(print,-q, eachFile)
--
http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
Math [EMAIL PROTECTED] wrote: I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 I know something with float and //... http://www.python.org/doc/faq/general/#why-are-floating-point-calculations-so-inaccurate Eg a=1.090516455488E9 / 100 print a 1090.51645549 print repr(a) 1090.516455488 If you want a given number of decimal places you can use a formatter, eg print %.20f % a 1090.5164554881961354 -- Nick Craig-Wood [EMAIL PROTECTED] -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: To run a python script in all the machines from one server
Quoting [EMAIL PROTECTED]: Yogi I want to run a python script in all the machines that are Yogi connected through local network and collect the information about Yogi that machine such as HDD size, RAM capacity(with number of slots) Yogi ,processer speed etc. Yogi But i want to run a script from just the server, so that it should Yogi start scripts in all other machines, and get their local machines Yogi information and dump the same information in some FTP. Yogi Could you please let me know how can i do this?? Take a look at Nagios and plugins line nrpe. Another possibility is osh (http://geophile.com/osh). You could do something like this: osh @your_cluster [ f 'your_function' ] $ - your_cluster: logical name for the cluster. - your_function: A python function you write to be run on each host. - $: Prints information from each node as a python tuple. You could, instead of printing with $, pipe the result to other osh commands to further process the tuples containing information from each host. I wouldn't recommend this if the hosts are Windows since osh hasn't been tested on Windows. Jack Orenstein (author of osh) -- http://mail.python.org/mailman/listinfo/python-list
how to use ez_setup on a machine which does not have access to the internet
I did the following: 1. Downloaded ez_setup.py 2. Downloaded the setuptools-0.6a10-py2.4.egg 3. Downloaded the pysqlite-2.0.6-py2.4-linux-i686(2).egg Transferred all the files to the computer which is behind a firewall (with no access to the internet). I then did the following: path_to_python ez_setup.py setuptools-0.6a10-py2.4.egg it failed even though the setuptools-0.6a10-py2.4.egg was in the same directory. It gives me an error: urllib2.URLError: urlopen error (-2, 'Name or service not known') I looked at the documentation and it talked about a -f flag which allows you to specify the directory to look for the files and that did not work either. -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Em Ter, 2006-03-28 às 16:03 +0100, Sion Arrowsmith escreveu: Rather than writing your own reversing code, you might like to look at: .join(reversed(foo)) Or not: $ python2.4 Python 2.4.2 (#2, Nov 20 2005, 17:04:48) [GCC 4.0.3 2005 (prerelease) (Debian 4.0.2-4)] on linux2 Type help, copyright, credits or license for more information. .join(reversed(foo)) 'oof' foo[::-1] 'oof' $ python2.4 -mtimeit '.join(reversed(foo))' 10 loops, best of 3: 2.58 usec per loop $ python2.4 -mtimeit 'foo[::-1]' 100 loops, best of 3: 0.516 usec per loop $ calc 2.58/0.516 5 foo[::-1] is cleaner and performs 5 times better -- 'nuff said. Cheers, -- Felipe. -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a language/framework
walterbyrd [EMAIL PROTECTED] wrote: ... I consider php to be an abombination, the backward compatibility issues alone are reason enough to make me hate it. Rail looks promising, but it's difficult to find inexpensive hosting that supports rails. What's your budget? DreamHost offers Rails hosting for $7.95 per month, which definitely falls within what I would call inexpensive, just for example. I'm sure you can find others in similar price ranges. I like python much better, but I'm not certain it's as well suited for web developement. I'm not sure how th e apache module thing works. I am using shared hosting, they provide python, but I'm not sure how limited I'll be. What Python server-side frameworks does your shared hosting service support? Or do they only offer Python as a CGI language? I wouldn't even mind the steep learning curves, so much, except, it seems to me that anything developed with one framework, would not work with another. So if I changed my mind about which framework, I'd have to start all over again - re-learning everything, re-writing everything. Of course, everybody says their framework is the best. But how can I know for sure? I don't have time to try them all. Nobody does, which is the main advantage of Rails -- it so dominates the scene of web frameworks for Ruby, that nobody seriously wonders what framework to pick for that language (there exist others, but their mind share is close to zero). Python frameworks may interoperate at several levels (e.g. through the WSGI middleware layer) but that's not the same as having a single framework. OTOH, different frameworks may cater for different audiences: at one extreme, the webjockey who knows and loves the underlying technologies, from HTTP to SQL, and only wants high productivity without (what he or she perceives as) cruft on top and definitely without any conceptual blockage impeding access to the underlying technologies when that access is wanted; at the other extreme, somebody who doesn't even know the difference between SQL and HTTP, doesn't want to learn anything hard, and just wants to point and grunt and make three websites a day -- and, of course, anything in-between. For example, I've never seen an object-relational mapping (technical term for cruft that tries to avoid people having to learn and use SQL) which doesn't drive me into a murderous, foam-at-mouth rage in a very short time -- I *WANT* my SQL, I *LOVE* SQL, it's *WAY* more powerful and suitable for access to data than all those simulated OO DB people lay on top of it (of course, that does depend on having a REAL relational DB underneath, not, say, MySQL;-). Other people disagree very, very deeply with my preferences (as proven by the existence of a begazillion ORMs, including general-purpose ones as well as ones that are part of web-application frameworks). How is a poor web framework to make both groups happy (me on one side, all the rest of the world on the other;-) without becoming ridiculously complex and ungainly? Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
Em Ter, 2006-03-28 às 16:59 +0200, Fredrik Lundh escreveu: and consider using http://www.python.org/doc/lib/module-decimal.html instead. $ python2.4 Python 2.4.2 (#2, Nov 20 2005, 17:04:48) [GCC 4.0.3 2005 (prerelease) (Debian 4.0.2-4)] on linux2 Type help, copyright, credits or license for more information. from decimal import Decimal a = Decimal(1.090516455488E15) a Decimal(1.090516455488E+15) b = a / 100 b Decimal(1090516455.488) str(b) '1090516455.488' *But*, $ python2.4 -mtimeit -s 'from decimal import Decimal; a = Decimal(1.090516455488E15)' 'a/100' 1000 loops, best of 3: 222 usec per loop $ python2.4 -mtimeit -s 'a=1.090516455488E15' 'a/100' 100 loops, best of 3: 0.234 usec per loop $ calc 222/0.234 ~948.71794871794871794872 Decimal is almost one thousand times slower. Do you really need this accuracy? HTH, -- Felipe. -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
On Tue, 2006-03-28 at 06:15 -0800, Sathyaish wrote: And that the extra-memory operation I've given above is expensive, I believe. Is there an efficient way to do it? How big is your string? For short strings (i.e. where large means you don't have enough RAM to hold one extra copy.) Abc[::-1] 'cbA' Also, anytime you reach for a for-loop to build a string step by step, you are making a mistake. Consider your example. strText = foo strTemp = for chr in strText: strTemp = chr + strTemp Each loop you are copying the string again, the timing behavior of your function is O(n^2). If you are really concerned about memory allocation, well, I don't know if you realize this, but every time you call strTemp = chr + strTemp you are throwing away your old copy and building a new copy. Ouch. Forgive me for preaching, but you just committed the grievous act of premature optimization. Don't worry about that first malloc, if Python is going to call malloc, it has a lot of opportunity to do so later. And malloc isn't as evil as you make it out to be. One of the advantages of using a high level language is you get to leave the issue of how to implement the small stuff up to the language designer and focus on the bigger picture - algorithmic appropriateness and overall correctness. In my experience I've found that when under time pressure python programs tend to out perform C because doing it right is so much easier in the former. As for mutability, immutability is a big virtue and performance gain. If I have two pointers to immutable strings, once I compare them I can know for eternity which is larger, so long as I don't let go of my references to them. Thus I can use them as keys in a complicated and efficient data structure. If Python strings were mutable the best implementation we could hope for dict would be a linked list. Also, consider some other side effects of mutable strings. s = Abc myfancy_structre.add_somehow( s ) t = s[::-1] print s Abc print t cbA Now if strings were mutable: s = Abc myfancy_structre.add_somehow( s ) s.reverseme() print s cbA Other users of s between assignment and reversal (like myfancy_structure) might not be happy that is was reversed when they next must use it. Cheers - Adam DePrince -- http://mail.python.org/mailman/listinfo/python-list
Re: 1.090516455488E9 / 1000000.000 ???
On Tue, 2006-03-28 at 16:29 +0200, Math wrote: Hello, I got a simple and probably stupid newby question.. When I compute: 1.090516455488E9 / 100 the result is 1090516455.49 Should be 1090516455.488 repr( 1.090516455488E9/100 ) '1090.516455488' Works for me. Code snippet? Print does seem to round at 12 digits. print 1.090516455488E9/100 1090.51645549 Cheers - Adam DePrince I know something with float and //... Anybody? How do I get correct number? -- http://mail.python.org/mailman/listinfo/python-list
File objects and seek
I have a file object that contains a binary read in file. I would like to move to another position in the file to read in a record. seek seemsto work fine with a positive value, but not a negative one (moving back from the current relative position). Is this the intended behavior?How do I move backwards (towards the beginning) in the file? CheersTommy[EMAIL PROTECTED]http://homepage.mac.com/tgrav/"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction" -- Albert Einstein -- http://mail.python.org/mailman/listinfo/python-list
Re: freeze.py and GTK apps
On Mon, 2006-03-27 at 16:15 -0800, [EMAIL PROTECTED] wrote: After freezing a PYGTK app, I am unable to run it. It this a common problem, because I could not find any documentation on it at all. I tried freezing this example, which gets by the make as well, but running it results in a failure. This is on Ubuntu Linux: http://www.moeraki.com/pygtktutorial/pygtk2tutorial/examples/helloworld.py $ ./helloworld Traceback (most recent call last): File helloworld.py, line 7, in ? import gtk File /usr/lib/python2.4/site-packages/gtk-2.0/gtk/__init__.py, line 37, in ?from _gtk import * ImportError: No module named _gtk Any suggestions? -- Kristian Hermansen From the freeze README A warning about shared library modules -- When your Python installation uses shared library modules such as _tkinter.pyd, these will not be incorporated in the frozen program. Again, the frozen program will work when you test it, but it won't work when you ship it to a site without a Python installation. Freeze prints a warning when this is the case at the end of the freezing process: Warning: unknown modules remain: ... When this occurs, the best thing to do is usually to rebuild Python using static linking only. Or use the approach described in the previous section to declare a library path using sys.path, and place the modules such as _tkinter.pyd there. Same applies here ... -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a language/framework
walterbyrd wrote:
Way back when, I got a lot of training and experience in highly
structued software development. These days, I dabble with
web-development, but I may become more serious.
I consider php to be an abombination, the backward compatibility issues
alone are reason enough to make me hate it. Rail looks promising, but
it's difficult to find inexpensive hosting that supports rails.
I like python much better, but I'm not certain it's as well suited for
web developement.
It is. Much more than PHP.
The problem then is: which solution/framework. And there quite a few
Python web developpment solutions...
I'm not sure how th e apache module thing works.
It exposes most of the Apache API to Python, and provides hooks to take
control over request processing.
I am
using shared hosting, they provide python, but I'm not sure how limited
I'll be.
You can bet it'll be plain old cgi - possibly with an outdated Pyton
version.
Ideally, I would like to be able to develop a database driven web-app,
in much the same manner as I could develop an ms-access app. As much as
I dislike msft, I have to admit, an ms-access app can be put together
quickly, without any steep learning curve.
I've been looking at python web frameworks, and I'm not sure what to
think. It seems like these frameworks would allow me to do a lot of
work, with a small amount of code, but the learning curve seems very
steep.
Which frameworks have you looked at ?
I wouldn't even mind the steep learning curves, so much, except, it
seems to me that anything developed with one framework, would not work
with another.
heck, this is true of all frameworks ever (web or not, Python or not).
So if I changed my mind about which framework, I'd have
to start all over again - re-learning everything, re-writing
everything. Of course, everybody says their framework is the best. But
how can I know for sure?
Trying them ?
I don't have time to try them all.
Then only try the ones that *may* fit your needs !-)
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Seems like I want a pre-processor, but...
After some digging it seems that python does not have any equivalent to C's #if directives, and I don't get it... For example, I've got a bit of python 2.3 code that uses collections.deque.pop(0) in order to pop the leftmost item. In python 2.4 this is no longer valid - there is no argument on pop (rightmost only now) and you call .popleft() instead. I would like my code to work in both versions for now and simply want to add code like: if sys.version[:3] == 2.3: return self.myDeque.pop(0) else: return self.myDeque.popleft() but am recoiling a bit at the unnecessary conditional in there that I think will be run on every execution - unless the compiler has some magic detection of things like sys.version to compile out the conditional as if it were a preprocessor directive (seems highly unlikely!)?. What is the pythonic thing to do? This is in a generally usable file, not a package, so I don't want to make a version for each (which seems to be what every package out there does). It seems to be begging for a pre-processor directive set. Thanks, Russ -- http://mail.python.org/mailman/listinfo/python-list
Re: Seems like I want a pre-processor, but...
Russell Warren wrote: For example, I've got a bit of python 2.3 code that uses collections.deque.pop(0) in order to pop the leftmost item. In python 2.4 this is no longer valid - there is no argument on pop (rightmost only now) and you call .popleft() instead. the collections module was added in 2.4, so it's not clear what code you're really using under 2.3. but since it's not a standard module, maybe you could add the missing method yourself ? I would like my code to work in both versions for now and simply want to add code like: if sys.version[:3] == 2.3: return self.myDeque.pop(0) else: return self.myDeque.popleft() but am recoiling a bit at the unnecessary conditional in there that I think will be run on every execution - unless the compiler has some magic detection of things like sys.version to compile out the conditional as if it were a preprocessor directive (seems highly unlikely!)?. What is the pythonic thing to do? fork the function/method: if sys.version_info (2, 4): def myfunc(self): # using deque emulation return self.myDeque.pop(0) else: def myfunc(self): return self.myDeque.popleft() or wrap the non-standard deque class in a compatibility wrapper: if sys.version_info (2, 4): class mydequeclass(deque): def popleft(self): return self.pop(0) ... return self.myDeque.popleft() /F -- http://mail.python.org/mailman/listinfo/python-list
Re: String split
Peter Otten wrote:
The documentation for Python 2.4 has a better explanation.
-cut-
Quoted after http://docs.python.org/lib/string-methods.html#l2h-202.
Peter
Thanks, I haven't see it.
Just a question about that different algorithm, because it force the
developer to do other work for make the split result more logically
compatible:
S = # this can become from an external source like config parser
for s n S.split():
do the work... # don't go inside
that isn't compatible, so python split it into two different methods
the string, with:
for s n S.split(','):
do the work... # run one time into this
Michele
--
http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Felipe Almeida Lessa [EMAIL PROTECTED] wrote: Em Ter, 2006-03-28 Ã s 16:03 +0100, Sion Arrowsmith escreveu: .join(reversed(foo)) $ python2.4 -mtimeit '.join(reversed(foo))' 10 loops, best of 3: 2.58 usec per loop But note that a significant chunk is the join(): $ python2.4 -mtimeit '.join(reversed(foo))' 10 loops, best of 3: 2.72 usec per loop $ python2.4 -mtimeit 'reversed(foo)' 100 loops, best of 3: 1.69 usec per loop $ python2.4 -mtimeit 'foo[::-1]' 100 loops, best of 3: 0.516 usec per loop Yeah, I forget about [::-1] due to the high profile of the introduction of reversed(). Well, of sorted(), and reversed() coming along for the ride. And at some point reversed() will become a win: $ python2.4 -mtimeit 'reversed(range(200))' 10 loops, best of 3: 6.65 usec per loop $ python2.4 -mtimeit 'range(200)[::-1]' 10 loops, best of 3: 6.88 usec per loop -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ ___ | Frankly I have no feelings towards penguins one way or the other \X/ |-- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Re: Seems like I want a pre-processor, but...
Russell Warren wrote: After some digging it seems that python does not have any equivalent to C's #if directives, and I don't get it... For example, I've got a bit of python 2.3 code that uses collections.deque.pop(0) in order to pop the leftmost item. In python 2.4 this is no longer valid - there is no argument on pop (rightmost only now) and you call .popleft() instead. I would like my code to work in both versions for now and simply want to add code like: if sys.version[:3] == 2.3: return self.myDeque.pop(0) else: return self.myDeque.popleft() Often you can make these tests one-time by defining an appropriate object whose value depends on the test, then using that object instead of repeatedly making the test. In this case, I assume the code above is inside a class method. You could have the class conditionally define a myPopLeft() method like this (not tested): class MyClass(object): ... if sys.version[:3] == 2.3: def myPopLeft(self): return self.myDeque.pop(0) else: def myPopLeft(self): return self.myDeque.popleft() Now the class has a myPopLeft() method that does the right thing, and sys.version is only tested once, at class declaration time. You might want to make the condition explicitly on the deque class, also, using has_attr(deque, 'popleft'). Another example is the common code used to define 'set' portably across Python 2.3 and 2.4: try: set except NameError: from sets import Set as set In general the idea is to move the test from 'every time I need to do something' to 'once when some name is defined'. Kent -- http://mail.python.org/mailman/listinfo/python-list
Re: Seems like I want a pre-processor, but...
Russell Warren wrote: After some digging it seems that python does not have any equivalent to C's #if directives, and I don't get it... For example, I've got a bit of python 2.3 code that uses collections.deque.pop(0) in order to pop the leftmost item. In python 2.4 this is no longer valid - there is no argument on pop (rightmost only now) and you call .popleft() instead. collections is new in 2.4 -- I assume you mean list.pop(0) versus collections.deque.popleft(). I would like my code to work in both versions for now and simply want to add code like: if sys.version[:3] == 2.3: return self.myDeque.pop(0) else: return self.myDeque.popleft() but am recoiling a bit at the unnecessary conditional in there that I think will be run on every execution - unless the compiler has some magic detection of things like sys.version to compile out the conditional as if it were a preprocessor directive (seems highly unlikely!)?. What is the pythonic thing to do? This is in a generally usable file, not a package, so I don't want to make a version for each (which seems to be what every package out there does). It seems to be begging for a pre-processor directive set. Here's how I would rewrite your example: try: from collections import deque except ImportError: class deque(list): def popleft(self): return self.pop(0) # in your method: return self.myDeque.popleft() That way the performance impact almost vanishes for the newer python and your code is less cluttered with if ... else statements that are only there to pick the version specific code. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: How do clients(web browser) close a python CGI program that is not responding?
Actually my project is converting certain specially costomized XML file to HTML to display and edit. Sometimes the XML file is too big, or the client upload a very huge file for the server to process, which exceeds the processing ability of my server.(after all, it is a small server on my poor laptopwhich use winXP and IIS..not professional, huh?) I configures IIS to terminate CGI program if it do not complete in 20 sec. But it does not workPerhaps I should go to a IIS or apache forum for answer. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to inplement Session in CGI
bruno at modulix 写道： Sullivan WxPyQtKinter wrote: Python disappointly failed to provide a convinient cgi session management module. Probably because there are much better options for web programming in Python ? Really? Then what is it? -- http://mail.python.org/mailman/listinfo/python-list
Re: Seems like I want a pre-processor, but...
the collections module was added in 2.4 Ah... sorry about that. I should have checked my example more closely. What I'm actually doing is rebinding some Queue.Queue behaviour in a safe location like this: def _get(self): ret = self.queue.popleft() DoSomethingSimple() return ret And self.queue.popleft() used to be self.queue.pop(0). self.queue is a deque object in 2.4 so I just used transferred that unluckily to the post in a poor attempt to simplify it - I had no clue that it was new. Should have made one up from scratch. Anyway - it worked... you've answered my question perfectly, thanks. I hadn't considered that the module loading phase could basically used for preprocessing. You even helped by subtly providing a better version checker... I didn't even know you could use with a tuple like that. I'll have to look into the logic rules there. Russ -- http://mail.python.org/mailman/listinfo/python-list
Re: String split
Michele Petrazzo wrote:
Just a question about that different algorithm, because it force the
developer to do other work for make the split result more logically
compatible:
S = # this can become from an external source like config parser
for s n S.split():
do the work... # don't go inside
that isn't compatible, so python split it into two different methods
the string, with:
for s n S.split(','):
do the work... # run one time into this
No question.
def split_any(s, seps):
... for sep in seps:
... parts = s.split(sep)
... if len(parts) 1:
... return parts
... raise ValueError
...
split_any( alpha beta , [,, None])
['alpha', 'beta']
split_any(alpha,beta, [,, None])
['alpha', 'beta']
split_any(alpha_beta, [,, None])
Traceback (most recent call last):
File stdin, line 1, in ?
File stdin, line 6, in split_any
ValueError
The answer :-)
Seriously, I think you have to be a bit more explicit on what you want to
know.
Peter
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Re: in-place string reversal
Sion Arrowsmith wrote:
But note that a significant chunk is the join():
$ python2.4 -mtimeit '.join(reversed(foo))'
10 loops, best of 3: 2.72 usec per loop
$ python2.4 -mtimeit 'reversed(foo)'
100 loops, best of 3: 1.69 usec per loop
your second benchmark doesn't do any reversal, though. it only
creates a bunch of reversed() iterator objects.
it's a little like my old faster-than-the-speed-of-light XML parser
benchmark:
dir test.xml
...
2005-05-04 20:41 12 658 399 test.xml
...
python -m timeit -s import cElementTree matches = (elem.get('value')
for event, elem in cElementTree.iterparse('test.xml') if elem.get('name')
== 'reselectApi')
1000 loops, best of 3: 198 usec per loop
python -c print 12658399 / 198e-6
63931308080.8
(64 gigabytes per second? who said XML was a performance hog ?)
/F
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Re: in-place string reversal
Sathyaish wrote: How would you reverse a string in place in python? I am seeing that there are a lot of operations around higher level data structures and less emphasis on primitive data. I am a little lost and can't find my way through seeing a rev() or a reverse() or a strRev() function around a string object. I could traverse from end-to-beginning by using extra memory: strText = foo strTemp = for chr in strText: strTemp = chr + strTemp but how would I do it in place? Forget it! I got the answer to my own question. Strings are immutable, *even* in python. Why not! The python compiler is written in C, right? It is amazing how just writing down your problem can give you a solution. PS: Or, if my assumption that strings are immutable and an in-place reversal is possible, is wrong, please correct me. If you are using strings that are long enough where you're going to run into memory issues, you can create a character array from the array module. This will basically create a mutable string. -- http://mail.python.org/mailman/listinfo/python-list
Re: win32com: error 80004005
I solved it. If someone else is in the same situation... It was due to a defective installation. I reinstalled python and pywin, re-registered the server and everything worked well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Seems like I want a pre-processor, but...
Thanks guys - all great responses that answered my question in a few different ways with the addition of some other useful tidbits! This is a nice summary: In general the idea is to move the test from 'every time I need to do something' to 'once when some name is defined'. Gotta love the response time of this newsgroup... Russ -- http://mail.python.org/mailman/listinfo/python-list
Re: Threads and sys.excepthook
Jesus Rivero - (Neurogeek) wrote: Original exception was: Unhandled exception in thread started by Error in sys.excepthook: Original exception was: And if put a time.sleep(1) after the thread.start_new(test, (name,)) #(1) part, then it does it all perfectly. Looks like the interpreter is shutting down before all the exception processing finishes. -Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: How to inplement Session in CGI
Sullivan WxPyQtKinter wrote:
bruno at modulix 写道：
Sullivan WxPyQtKinter wrote:
Python disappointly failed to provide a convinient cgi session
management module.
Probably because there are much better options for web programming in
Python ?
Really? Then what is it?
Please notice the 's' at the end of 'options'. For a quick and
incomplete overview, you can start here:
http://wiki.python.org/moin/WebProgramming
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python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
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values turning into object instances
I am trying to convert a tuple into a list using the list function. Before I do this I have this: print CurSht.Range(A2:A63) ((45666.0,), (45777.0,), (45888.0,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,), (None,)) Then I get this: print list(CurSht.Range(A2:A63)) [win32com.gen_py.Microsoft Excel 11.0 Object Library.Range instance at 0x16031176, win32com.gen_py.Microsoft Excel 11.0 Object Library.Range instance at 0x16031216, win32com.gen_py.Microsoft Excel 11.0 Object Library.Range instance at 0x16031256] (It has many more instances than this. I shortened it in order to make this less lengthy) Not sure why the values turn into these instances that dont have the attributes I need. Any help for this noob would be much appreciated. Thanks, Clayton -- http://mail.python.org/mailman/listinfo/python-list
Re: in-place string reversal
Em Ter, 2006-03-28 às 17:32 +0100, Sion Arrowsmith escreveu: ride. And at some point reversed() will become a win: $ python2.4 -mtimeit 'reversed(range(200))' 10 loops, best of 3: 6.65 usec per loop $ python2.4 -mtimeit 'range(200)[::-1]' 10 loops, best of 3: 6.88 usec per loop Not fair: $ python2.4 Python 2.4.2 (#2, Nov 20 2005, 17:04:48) [GCC 4.0.3 2005 (prerelease) (Debian 4.0.2-4)] on linux2 Type help, copyright, credits or license for more information. range(200)[::-1] [199, 198, ..., 1, 0] reversed(range(200)) listreverseiterator object at 0xb7d1224c list(reversed(range(200))) [199, 198, ..., 1, 0] list(reversed(range(200))) == range(200)[::-1] True ^D Now we're in a fair competition: $ python2.4 -mtimeit -s 'a=range(200)' 'a[::-1]' 10 loops, best of 3: 2.23 usec per loop $ python2.4 -mtimeit -s 'a=range(200)' 'list(reversed(a))' 10 loops, best of 3: 5.62 usec per loop $ calc 5.62/2.23 ~2.52017937219730941704 $ python2.4 -mtimeit -s 'a=range(20)' 'a[::-1]' 100 loops, best of 3: 10.7 msec per loop $ python2.4 -mtimeit -s 'a=range(20)' 'list(reversed(a))' 100 loops, best of 3: 11.5 msec per loop $ calc 11.5/10.7 ~1.07476635514018691589 But: $ python2.4 -mtimeit 'range(199, -1, -1)' 10 loops, best of 3: 4.8 usec per loop $ python2.4 -mtimeit 'range(200)[::-1]' 10 loops, best of 3: 7.05 usec per loop $ calc 7.05/4.8 1.46875 $ python2.4 -mtimeit 'range(19, -1, -1)' 100 loops, best of 3: 13.7 msec per loop $ python2.4 -mtimeit 'range(20)[::-1]' 10 loops, best of 3: 24 msec per loop $ calc 24/13.7 ~1.75182481751824817518 And worse: $ python2.4 -mtimeit 'list(reversed(range(200)))' 10 loops, best of 3: 10.5 usec per loop $ calc 10.5/4.8 2.1875 $ python2.4 -mtimeit 'list(reversed(range(20)))' 10 loops, best of 3: 24.5 msec per loop $ calc 24.5/13.7 ~1.78832116788321167883 HTH, -- Felipe. -- http://mail.python.org/mailman/listinfo/python-list
Re: Obtaining the remote ip address
While on the subject of network identity, does anyone have a scheme to get the MAC address of the end device? I've never come up with a way to do it, but I haven't had it proven to me that it is impossible (yet). Justin Ezequiel wrote: os.environ['REMOTE_ADDR'] os.environ['REMOTE_HOST'] -- http://mail.python.org/mailman/listinfo/python-list
Re: CGI redirection: let us discuss it further
Sullivan WxPyQtKinter wrote:
1. Are there any method (in python of course) to redirect to a web page
without causing a Back button trap... rather than the redirection page
with a Location: url head
What's wrong with the redirection page?
If there's really a necessary reason for not using an HTTP redirect
(for example, needing to set a cookie, which doesn't work cross-browser
on redirects), the best bet is a page containing a plain link and
script-redirect, using location.replace() to avoid the back button
trap.
2. Are there any method to use relative path, rather than full absolute
URI path in Location: url? It is very essential for later transplant
work, e.g.,transplant a folder of cgi scripts from one web server to
another, with different URL.
Just read the name of the server (os.environ['SERVER_NAME']) to work
out what absolute URL to redirect to, whist still being portable.
Here's some code I dug up that should also cope with non-default ports
and SSL, if that's of any use:
ssl= os.environ.get('HTTPS', 'off') not in ('', 'off', 'false', 'no')
scheme= ['http', 'https'][ssl]
port= ['80', '443'][ssl]
host= os.environ.get('SERVER_NAME', 'localhost')
url= '%s://%s:%s' % (scheme, host, os.environ.get('SERVER_PORT',
port))
if url.endswith(':'+port):
server= server[:-(len(port)+1)]
url+= path
(You *can* pass relative URLs back to the web server in a Location:
header, but this should do an internal redirect inside the server,
which may not be what you want.)
--
And Clover
mailto:[EMAIL PROTECTED]
http://www.doxdesk.com/
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