[ANN] pyxser-0.2r --- Python XML Serialization
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Hello, I'm pleased to announce pyxser-0.2r, a Python-Object to XML serializer and deserializer. This package it's completly written in C and licensed under LGPLv3. The tested Python versions are 2.5.X and 2.6.X. * home page: http://coder.cl/software/pyxser * hosted at: https://sourceforge.net/projects/pyxser/ The current ChangeLog is as follows: 0.2r (2009.04.18): Daniel Molina Wegener d...@coder.cl * Removed memory leaks concerning libxml2 usage. * Removed memory leaks concerning Python C/API usage. * Improved fault detection. * Improved pointer checking deallocations. * Added unit test test-utf8-prof.py with 50.000 cilces ;) * Every serilization is made into unicode objects. Feel free to use and test. You can modify test-utf8-prof.py to use more than 50.000 cicles depending on your libxml2 version. Best regards, - -- .O. | Daniel Molina Wegener | FreeBSD Linux ..O | dmw [at] coder [dot] cl | Open Standards OOO | http://coder.cl/| FOSS Developer -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (FreeBSD) iQIcBAEBCgAGBQJJ6r9KAAoJEHxqfq6Y4O5NP7IQAM87ngHCTEMabwP7CgdPWjcH thCkhdWVr+ri6L9HRZfKel8dhG1MharBWCBJjrPH+NA0aV03g0Rk2gw69DPJ3HuF WsLx8jI0NQEGI4nYHPmP8tq+A7r2iI/3UHz9HL2rMMxpHbn/Jzcsidtf8irffLhQ XBzyMpfhS6HaAJxmRY1SxbgFiim5egvfo0kQ+ywgmDKLs6tbaJLOpdeYBFZMLCzQ Q6UAdQZf7yN+zqNWuL3tW+Bp4nJZP1BqCXXpiT6U69TmBtnM5SzrHjBzEUEGycDd xDkszjRBU/k159dLbsItC50VhdfBdrcHK/FPS+4oPrdUkIH2Ue/l2/OekxFXKI7X DlcqnYqECskzIyQeaaR0DOXeO8nq8LJVU2Sg3kXlsddTLY+f2cdp7IvQ6e1krynA U/2KMiXYqyMe1VtxyPzp7W/yrFJa7yWrPXQtBrPnUsiYIjD08XH/C+DOdPN65nTG NFL7Hulz4toJYz29G3CCsUgObQ2XrMG2iY361pe/lNuoW7GcFF5leiKBHInFIEit Kz7owCGfpAN4jXtAQRYpfnqIM2M+ixgKbMLrzds5tCByeOixlfBVJveeko5csLRV IXyQgDHJaFXU9w0oXdFSE9r2nbIE100iuYyaX8kP98HFbHnEL6cq7Cw4pA0eSn2Y jU0mjTQJDW2ic2zyZvte =sDDJ -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[ANN] pyxser-0.2r --- Python XML Serialization
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Hello, I'm pleased to announce pyxser-0.2r, a Python-Object to XML serializer and deserializer. This package it's completly written in C and licensed under LGPLv3. The tested Python versions are 2.5.X and 2.6.X. * home page: http://coder.cl/software/pyxser * hosted at: https://sourceforge.net/projects/pyxser/ The current ChangeLog is as follows: 0.2r (2009.04.18): Daniel Molina Wegener d...@coder.cl * Removed memory leaks concerning libxml2 usage. * Removed memory leaks concerning Python C/API usage. * Improved fault detection. * Improved pointer checking deallocations. * Added unit test test-utf8-prof.py with 50.000 cilces ;) * Every serilization is made into unicode objects. Feel free to use and test. You can modify test-utf8-prof.py to use more than 50.000 cicles depending on your libxml2 version. Best regards, - -- .O. | Daniel Molina Wegener | FreeBSD Linux ..O | dmw [at] coder [dot] cl | Open Standards OOO | http://coder.cl/| FOSS Developer -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (FreeBSD) iQIcBAEBCgAGBQJJ6r8/AAoJEHxqfq6Y4O5Nw5EP/0HTk0Wi5Sjlo/Hk+xPmPmK5 GGNg9f/oUL2I6iPZgTwscZAY0E0AZmmdsQz4NsiBvjtwT0b9IQ5r2+O8aSn1kkdj 0Sf+v94FGyCE7yqOuxwpYgg2MyPUDxX4g4BHLyuLkWYhIqEKJdUbXxFXtzdTlzku jETk3SSpyvQjGzoqFOycnEOfBnfJvm6invds1Je/LEylvBjznbTLXhFCylz26Bns LubjOULZC9ONLZ5uEScss3ac1LsphXqm1yVktTlgUUs4XIG1H5udNl/+fQF4LeCx vpF9b6eOsf+WTp8ggSumxbB/RRxCl/QGPxGr2x4QmMJjLQeL/HolzGKXg344fEs9 6c34+R0e6WC8aAeuQjYvz01Puv+q6ZydwUyTLvpEYc1eZ2JZv/zSLM/U0IdQ3mc4 5/c9pDIQAjj/sObf4QNLNQzWFV+OS7AVOQ3wlPZPovfZNg4dQbFqPsLmhm9A50oS bDPurcPBaoS1vTf01M6gnaidHeqzn+5gkpJC7HFJYwlsFCbvNIpdTWLqw26SYFuF WOzEKnvVxABlzMP9uao7Ve/4AmTaadCbdwdkBH3H4TxgcW22vEwgpZW5pywCH+0n NIndKXmOURlUfiduoBkHkR9PB9EdT8JEV8hW8K3v0e0PFIjiFfc9JwNcGowlTENq 9eaiXjqOFz/j2q0OacTu =cLLy -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
On Apr 18, 5:19 pm, a...@pythoncraft.com (Aahz) wrote: Okay, I'm curious, is the argument that you shouldn't use generators for coroutines or something else? Yes, there is certainly the confusion between generators and coroutines (the ones David Beazley warns about). At first, I was a supported of yield expressions. After they entered in Python 2.5 and I had occasion to play with them in practice, I realized that we did not gain much from them. In an ideal world (one that would never happen) I would like to remove yield expressions and keep generators simple. OTOH, I would like a simple coroutine library in the standard library, with a trampoline and a scheduler. Coroutines, however, would be implemented as simple objects with a .send and .recv method, not by abusing yield expression. May be we would lose a tot percent of performance, but that should not be a concern for a Pythonista. I dunno if Peter Otten thinks the same or has other ideas, but this is what I have in mind. The important addition in Python 2.5 was the introduction of GeneratorExit and the ability to use yield inside try .. finally blocks. This was a needed language level change. Coroutines instead could have been implemented as a library, without requiring any language change. But the point is moot, anyway, and certainly I did not think of it at the time yield expressions were introduced. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Can some1 review my code?
hi I am from java background, I have written some code that actually works :) Need to some one to look at it and tell me if there are better ways of doing same things Will some one help? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
-On [20090419 08:20], zaheer.ag...@gmail.com (zaheer.ag...@gmail.com) wrote: Need to some one to look at it and tell me if there are better ways of doing same things Just post the snippets of code you want review of. -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B Nobilitas sola est atque unica virtus... -- http://mail.python.org/mailman/listinfo/python-list
Re: need to start a new project , can python do all that ?
-On [20090415 14:25], Deep_Feelings (doctore...@gmail.com) wrote: 4- support of international languages http://babel.edgewall.org/ -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B Hope is a letter that never arrives, delivered by the postman of my fear... -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
On Sun, 19 Apr 2009 06:33:23 +0100, Tim Wintle wrote: On Sun, 2009-04-19 at 05:08 +, Zaphod wrote: Well, most of the Linux kernel is written in C and while there *is* a jump (often JMP) in most asms, you should only do so if you really need to. JSR (jump sub routine) is a better idea in many (most?) cases. Have to say that I feel jump is more than justified in some situations (when it's jumping to within 10-20 lines of the start position, and it's a routine that needs to be highly optimised - I'm thinking tail recursion etc.) (btw, how come nobody has mentioned python bytecode? Most flow control is jumps) I wrote yesterday: GOTO, after all, is just a jump, and we use jumps in Python all the time: raise Exception break continue if... elif... else... for... else... etc. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
On Sat, 18 Apr 2009 23:18:32 -0700, zaheer.agadi wrote: hi I am from java background, I have written some code that actually works :) Need to some one to look at it and tell me if there are better ways of doing same things Will some one help? Are you offering to pay or are you after free advice? How large is your code? Ten lines, ten thousand lines, ten million lines? What does it do? How about if you start with a small, self-contained function (say, 20 to 50 lines) that can be understood in isolation from the rest of your code, and we'll comment on that. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyxser-0.2r --- Python XML Serialization
Daniel Molina Wegener wrote: * Every serilization is made into unicode objects. Hmm, does that mean that when I serialise, I get a unicode object back? What about the XML declaration? How can a user create well-formed XML from your output? Or is that not the intention? Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
On Apr 19, 11:29 am, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: On Sat, 18 Apr 2009 23:18:32 -0700, zaheer.agadi wrote: hi I am from java background, I have written some code that actually works :) Need to some one to look at it and tell me if there are better ways of doing same things Will some one help? Are you offering to pay or are you after free advice? How large is your code? Ten lines, ten thousand lines, ten million lines? What does it do? How about if you start with a small, self-contained function (say, 20 to 50 lines) that can be understood in isolation from the rest of your code, and we'll comment on that. -- Steven Thanks guys, I am asking free advice,The program is not very complex it is around 500 lines with most the code being reused, I am bit hesitant to post the code publicly, is it ok if I send part of code say a function. Or does it makes more sense if I send the complete code to you guys personally? -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
On Apr 19, 8:09 am, Michele Simionato wrote:
Coroutines instead could have been implemented as
a library, without requiring any syntax change.
Here is a proof of principle, just to make clearer
what I have in mind. Suppose you have the following
library:
$ cat coroutine.py
from abc import abstractmethod
class Coroutine(object):
@abstractmethod
def main(self):
yield
def send(self, value):
if not hasattr(self, '_it'): # first call
self._it = self.main()
self._value = value
return self._it.next()
def recv(self):
return self._value
def close(self):
self._it.close()
del self._it
del self._value
Then you could write coroutines as follows:
$ cat coroutine_example.py
from coroutine import Coroutine
class C(Coroutine):
def main(self):
while True:
val = self.recv()
if not isinstance(val, int):
raise TypeError('Not an integer: %r' % val)
if val % 2 == 0:
yield 'even'
else:
yield 'odd'
if __name__ == '__main__':
c = C()
for val in (1, 2, 'x', 3):
try:
out = c.send(val)
except StopIteration:
break
except Exception, e:
print e
else:
print out
This is not really worse of what we do today with the yield
expression:
$ cat coroutine_today.py
def coroutine():
val = yield
while True:
if not isinstance(val, int):
raise TypeError('Not an integer: %r' % val)
if val % 2 == 0:
val = yield 'even'
else:
val = yield 'odd'
if __name__ == '__main__':
c = coroutine()
c.next()
for val in (1, 2, 'x', 3):
try:
out = c.send(val)
except StopIteration:
break
except Exception, e:
print e
else:
print out
Actually it is clearer, since it avoids common mistakes
such as forgetting the ``val = yield`` line in the coroutine
function and the ``c.next`` line right after instantiation
of the coroutine object, which are needed to initialize
the coroutine correctly.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
Steven D'Aprano steveource.com.au wrote: COMEFROM on the other hand is just the purest evil imaginable. *grin* - I expect you say this because it is a bit like COBOL's alter - you cannot *see* it in place when you read the code, and the effect is only apparent at run time after the distant statement has been executed. Kind of fun... - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
Aaron Brady casti.@gmail.com wrote: On Apr 18, 4:44 am, Hendrik van Rooyen m...@microcorp.co.za wrote: to untangle some spaghetti code. He did not mention if the spaghetti was actually doing it's job, bug free, which IMO is the only rational test for the quality of a piece I don't use 'rational' in the same way. Do you mean objective? Do readability, brevity, simplicity, purity, etc. contribute to quality? Is program quality equivalent (or identical) to code quality? This paragraph illustrates the problem, I think: Is there a significant difference between rational and objective? Define readability, brevity, simplicity, purity, etc as applied to the quality of a programme - it leads, inevitably, to a floundering around in a wash of words. However, to stop playing Devil's Advocate, there is such a thing as code quality, but it cannot be defined, just like quality in general terms cannot be defined - as soon as you try, it turns to dross in your hands. Read Robert Pfirsig's Zen and the art of motorcycle maintenance for a full explanation of this effect. I do not agree with the reasoning that effectively says: If it is difficult to comprehend, it must be wrong Wrong no, but impractical, possibly or probably or almost certainly, notwithstanding the subject-dependence of ease of comprehension. Simple code is more future-resilient than that which is difficult to comprehend, even holding the language (version) constant. It is a I think that the emphasis on future proofing code is actually overrated. We try to code as if we are building pyramids, for all time, but the sad experience is that only a tiny percentage of application code written has a life of longer than about eight years. 8-- that of exploration, pioneering, research, and development. However, even in simplest terms, some structures e.g. recursion, may be difficult to comprehend, but that doesn't mean they would be better more complicated. This is true - the one does not imply the other, but the subtlety is that it cuts either way - not more complicated, and not more simple. One has to strike a balance, and this is closer to an art than a science. That said, however, throwing out the goto ( or even the more intriguing comefrom ) is forcing the artist to paint while removing an element from his palette - he has to work around the lack. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
BJörn Lindqvist b...@gmail.com wrote: I can somewhat sympathise with the op, neither python nor any other mainstream language can still do this: SCREEN 13 PSET 160,100,255 Oh come on! Don't be like that! Tell us what it does, please. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
Brian Blais wrote: On Apr 18, 2009, at 5:44 , Hendrik van Rooyen wrote: to untangle some spaghetti code. He did not mention if the spaghetti was actually doing it's job, bug free, which IMO is the only rational test for the quality of a piece of code, because it is the reason for its existence. The aesthetics are, like all aesthetics, a matter of opinion. Actually, I strongly disagree with this statement. In my experience, there has been very very few pieces of code that I've written that I hadn't wanted to *modify* at some point: extend it to a new set of circumstances, cover a different case, change the output, etc... The quality of a piece of code is not just if it works right now, but if you can reasonably extend it for the future. Your experience is different from mine - in what I mostly do, which is struggling around in embedded assembler, by the time the thing works it is stable, and I very seldom have to go back to fiddle with it. On the other hand, I understand what you are talking about, but I think that the origen of the frustration that one feels when having to battle with some old code, is actually inside oneself - the code is the same, but I have changed, and I am no longer the same as I was when I wrote it. I toyed with Perl for a year or so, but couldn't give it my full attention. As a result, every few weeks when I wanted to modify what I wrote, I had to re-learn the code all over again because the syntax was so terse. The same is true for the typical use of a goto: you have to relearn the program, because the flow jumps around. It's not just about aesthetics, but about being able to work with a piece of code. In my defense of the goto, I would like to make clear that I do not support its use to produce spaghetti. In general, muddled thinking, coupled with expediency, is what I think are the true precursors of spaghetti code. The goto is an innocent tool that can be used for good or evil. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
zaheer.ag...: I am asking free advice,The program is not very complex it is around 500 lines with most the code being reused, 500 lines is not a small Python program :-) If you don't want to show it, then you can write another program, a smaller one, for the purpose of letting people review it. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
Mensanator mens...@aol.com wrote: 8 -- description of bugs in spaghetti --- Looks like that design really needed sorting out! A programmer once said to me Why should I run it, I know how it works, I wrote it. Are you serious? In my opinion, anybody who says this is not a programmer, but merely an arrogant idiot with a lot of misplaced self- confidence - somewhat like a permanent force corporal. My reply: You only THINK you know how it works. _I_, on the other hand, ACTUALLY know how it works because I've run it. How did you manage to keep your reply so meek? You must be a really well brought up person. :-) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
On 4月19日, 下午2时18分, zaheer.ag...@gmail.com wrote: hi I am from java background, I have written some code that actually works :) Need to some one to look at it and tell me if there are better ways of doing same things Will some one help? Thanks Post first, then someone will review, I think. -- http://mail.python.org/mailman/listinfo/python-list
Re: Useful MySQL Routines
Lawrence D'Oliveiro wrote: I've done a writeup on some of the basic routines I frequently use here http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines. Why is that specific to mysql? Btw, the bulkinserter could be better done by using executemany and select usefull batch sizes. If you allow query construnction better don't forget appropriate quoting of table- and column names too to be on the safe side. Regards Tino -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
Aahz wrote: In article 07ad771b-a6d1-4f08-b16c-07caf7462...@e18g2000yqo.googlegroups.com, Michele Simionato michele.simion...@gmail.com wrote: On Apr 18, 3:03=A0pm, a...@pythoncraft.com (Aahz) wrote: In article gsc7e1$rj6$0...@news.t-online.com, Peter Otten =A0__pete...@web.de wrote: If it were up to me I'd rip out send() immediatly. At first I thought I would see a compelling use case and be enlightened, but it never happened. Too late -- it's likely to get an upgrade for 3.1 and 2.7. Basically, Could you give some details or a link? send() is useful for coroutines, and if you haven't yet read http://dabeaz.com/coroutines/ you really should (assuming you want to continue arguing). I only just started reading Beazley's presentation, it looks interesting. Thanks for the hint! Are you currently using coroutines in Python? If so, what kind of practical problems do they simplify for you? I suspect Peter knows everything about coroutines and still he is not convinced about .send. FWIW, I am sympathic with him. Okay, I'm curious, is the argument that you shouldn't use generators for coroutines or something else? I don't know nearly as much about coroutines as Michele thinks; in particular I have no practical experience with them. What I've seen so far is that the once beautifully simple generator mechanism has become very complex with the recent additions for ressource management and coroutines. Generators as filters and synthetic sequences are now ubiquitous, the with statement is spreading like wildfire. The send()/yield-expression duo on the other hand is limping along, and someone like Michele who is definitely in the intended audience for the more arcane features of Python says that you can do it with a library. If that is possible shouldn't it have been the first step to put such a library into the stdlib and see how it fares? Generators at the moment seem to have turned into what in German we call an eierlegende Wollmilchsau*. Peter (*) http://www.pollux.franken.de/fileadmin/user_upload/images/eier-legende-wollmilchsau.jpg -- http://mail.python.org/mailman/listinfo/python-list
Re: Useful MySQL Routines
In message mailman.4148.1240135989.11746.python-l...@python.org, Tino Wildenhain wrote: Lawrence D'Oliveiro wrote: I've done a writeup on some of the basic routines I frequently use here http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines. Why is that specific to mysql? Because that's all I've used so far. Though sqlite looks interesting for single-user stuff... Btw, the bulkinserter could be better done by using executemany and select usefull batch sizes. Hmm, I've never bothered with executemany. The code as written copes comfortably with 10,000 records or so. If you allow query construnction better don't forget appropriate quoting of table- and column names too to be on the safe side. Hmm, I never worried about that, because I was I tried to be careful in the names I chose. And I've never allowed object names to come from user input :). Besides, how do you deal with characters that are still illegal when quoted http://dev.mysql.com/doc/refman/5.0/en/identifiers.html? -- http://mail.python.org/mailman/listinfo/python-list
can python access OS level features like bash scripting?
Hello all, Right now I am a bit confused on a final stage of my project. I need to create an installer and an executable file for my python program for gnu/linux. The install script has to put the package into site-packages folder where all other libraries reside. Then put the executable file into /usr/bin as other files. The installer must also do the basic task of creating the database and setting up password for on postgresql. now here comes the main problem. I believe putting files into proper places is pritty easy (may be some one will instantly reply to the issue of putting the executable file and libraries in place ). But to do the database based activities, I need python-psycopg2 module for postgresql in the first place. So is it possible for python to self download and install all the necessary modules on to the client machine? What further complicates the system is the fact that I want in future to create 2 deb files, one for installing the gtk based client application and the other to install the server side app made in python-twisted for rpc. Now the obvious problem is that first my python installation (either 2.5 or 2.4) must check for itself if the modules are present or not and if they are not present, my install utility must either download it from net or if that's not the recommended approach then compile the module from the source. how do I achieve all this in python? I know bash could be used to do such things but I don't want to use bash because it is to clunky and won't run easily on windows. Moreover I want to create a deb file as I said before so I want to keep it as simple as possible. Even regarding the executable, I am confused on using bash as the script for writing the executable which can then do some thing like python -c and call the modules, or write this executable code in a main.py and put that file into the executable path i.e /usr/bin. Please clear this mater so that I can go ahead. I know the python list is pritty busy and I must thank all the members who keep the spirit of the community and the professional organisations alive so may be I will get a solution to my problem soon. happy hacking. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
zaheer.ag...@gmail.com wrote: hi I am from java background, I have written some code that actually works :) Need to some one to look at it and tell me if there are better ways of doing same things Will some one help? Thanks My crystal ball is a bit cloudy today so forgive me if my suggestions may seem off-topic in your request. I find that reviewing code that hasn't conform to 'standards' distracts me from the original intent. Parsing your code through a lint like PyLint will suggest 'standard' way of doing things (aim for 10/10) it will make things easier to read. Also code that is unnecessary bloated (e.g. conditions that are never executed) can confuse the issue even more so. A good way would be to write unit-test against your code out of the perspective of the intended use (so not just to execute stuff because it is there) then run it through a coverage program. This will display nicely what code is executed and what not. The not part is what you look for in this perspective since if all the unit-test have what you need, why should the uncalled code be included? Next stop comments, I am all for comments except if you need them to translate what the piece of code is doing there, if you can refactor your code so it looks more English and is understandable without comments (which should be still in there though) then do so. For example: range_8 = range(8) for number in range_8: # Loop through 0 to 7 and print it. print(number) instead of: r = range(8) for i in r: # print i in range(8) loop print(i) * note this is a bad code example, only to clarify what I mean in general Then look at your code from a functional perspective, if there are multiple functions that act in a similar way can you replace them with a single function? Then do so. Is there functionality that looks so common that you think it should be in the standard library? It probably is then, make use of it. Performance; run your code through a execution analyser like profile, do the numbers make sense? If not try to figure out why and replace the affected algorithm with one that makes more sense. Finally memory; Can you scrap duplicate entries of essential the same data, without affecting all the above? Might be a good idea to do so. When done all this you might feel it is not necessary to review the code any more, which is then is a good moment to actually request a review :-) I'll be happy to have a look at it though you might consider posting it here, more chance of useful feedback ;-) -- MPH http://blog.dcuktec.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
On Apr 19, 2009, at 4:35 , Hendrik van Rooyen wrote: Brian Blais wrote: On Apr 18, 2009, at 5:44 , Hendrik van Rooyen wrote: to untangle some spaghetti code. He did not mention if the spaghetti was actually doing it's job, bug free, which IMO is the only rational test for the quality of a piece of code, because it is the reason for its existence. The aesthetics are, like all aesthetics, a matter of opinion. Actually, I strongly disagree with this statement. In my experience, there has been very very few pieces of code that I've written that I hadn't wanted to *modify* at some point: extend it to a new set of circumstances, cover a different case, change the output, etc... The quality of a piece of code is not just if it works right now, but if you can reasonably extend it for the future. Your experience is different from mine - in what I mostly do, which is struggling around in embedded assembler, by the time the thing works it is stable, and I very seldom have to go back to fiddle with it. On the other hand, I understand what you are talking about, but I think that the origen of the frustration that one feels when having to battle with some old code, is actually inside oneself - the code is the same, but I have changed, and I am no longer the same as I was when I wrote it. You're right about the person changing, not the code...for me it's mostly forgetting. :) I have found that python lets me re-learn my old code much faster (usually there is no re-learning necessary - just re-reading) then Perl, C, and Matlab. As for fiddling with code, most of the code I write for work is for exploring ideas in theoretical neuroscience. Once you have something that works, and you understand the problem, the next things out of your mouth is I wonder what happens if this is changed?. Change is the norm In my defense of the goto, I would like to make clear that I do not support its use to produce spaghetti. In general, muddled thinking, coupled with expediency, is what I think are the true precursors of spaghetti code. The goto is an innocent tool that can be used for good or evil. as is true of any tool, but I think that the goto is a little too convenient for the sloppy thinker, and shouldn't be lying around to be picked up by just anyone. :) bb -- Brian Blais bbl...@bryant.edu http://web.bryant.edu/~bblais -- http://mail.python.org/mailman/listinfo/python-list
Re: pyqt4 qTableWidget add items help
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 ookrin – Samstag, 18. April 2009 20:16 from PyQt4 import ?? QtGui? QtCore? Those are already loaded other options are pyqtconfig and uic and those don't sound correct... from PyQt4 import QtGui QtGui.QTableWidgetItem See [1] for an example. [1] http://hg.lunaryorn.de/snippets/file/3272fdd93736/qt4_table_header_alignment.py - -- Freedom is always the freedom of dissenters. (Rosa Luxemburg) -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.11 (GNU/Linux) iEYEARECAAYFAknrGyYACgkQGV4vxEMMOxceGQCgky6GtUAOlyKxLLYCBWGYhwez 2zoAmgN9OecHib4imoxyn/FsLGaEIDw6 =EIsK -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
On Sun, 2009-04-19 at 06:26 +, Steven D'Aprano wrote: (btw, how come nobody has mentioned python bytecode? Most flow control is jumps) I wrote yesterday: GOTO, after all, is just a jump, and we use jumps in Python all the time: raise Exception break continue if... elif... else... for... else... etc. Ah - apologies Tim -- http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
Hi, I think you got lost in the wrong thread. Though your subject line is correct your post threads under Is there a programming language, that . . . Perhaps you 'replied' to above thread and changed 'just' the subject line. Chances to get an answer might be higher if you repost your question without replying to an existing thread. Krishnakant wrote: Hello all, Right now I am a bit confused on a final stage of my project. I need to create an installer and an executable file for my python program for gnu/linux. The install script has to put the package into site-packages folder where all other libraries reside. Then put the executable file into /usr/bin as other files. The installer must also do the basic task of creating the database and setting up password for on postgresql. now here comes the main problem. I believe putting files into proper places is pritty easy (may be some one will instantly reply to the issue of putting the executable file and libraries in place ). But to do the database based activities, I need python-psycopg2 module for postgresql in the first place. So is it possible for python to self download and install all the necessary modules on to the client machine? What further complicates the system is the fact that I want in future to create 2 deb files, one for installing the gtk based client application and the other to install the server side app made in python-twisted for rpc. Now the obvious problem is that first my python installation (either 2.5 or 2.4) must check for itself if the modules are present or not and if they are not present, my install utility must either download it from net or if that's not the recommended approach then compile the module from the source. how do I achieve all this in python? I know bash could be used to do such things but I don't want to use bash because it is to clunky and won't run easily on windows. Moreover I want to create a deb file as I said before so I want to keep it as simple as possible. Even regarding the executable, I am confused on using bash as the script for writing the executable which can then do some thing like python -c and call the modules, or write this executable code in a main.py and put that file into the executable path i.e /usr/bin. Please clear this mater so that I can go ahead. I know the python list is pritty busy and I must thank all the members who keep the spirit of the community and the professional organisations alive so may be I will get a solution to my problem soon. happy hacking. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
On Sun, 19 Apr 2009 05:08:32 GMT Zaphod zap...@beeblebrox.net wrote: Friend of mine made a really nice asm development environment for his home made OS. Too bad he didn't have any marketing skills. Was your friend's name Gary Kildall? :-) -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
In article gsetb1$jop$0...@news.t-online.com, Peter Otten __pete...@web.de wrote: Aahz wrote: In article 07ad771b-a6d1-4f08-b16c-07caf7462...@e18g2000yqo.googlegroups.com, Michele Simionato michele.simion...@gmail.com wrote: On Apr 18, 3:03=A0pm, a...@pythoncraft.com (Aahz) wrote: In article gsc7e1$rj6$0...@news.t-online.com, Peter Otten =A0__pete...@web.de wrote: If it were up to me I'd rip out send() immediatly. At first I thought I would see a compelling use case and be enlightened, but it never happened. Too late -- it's likely to get an upgrade for 3.1 and 2.7. Could you give some details or a link? http://mail.python.org/pipermail/python-ideas/2009-April/004189.html (You'll need to backtrack considerably to see the full discussion.) Are you currently using coroutines in Python? If so, what kind of practical problems do they simplify for you? I'm not; I avoid coroutines like the plague. ;-) I much prefer nice, simple threading... What I've seen so far is that the once beautifully simple generator mechanism has become very complex with the recent additions for ressource management and coroutines. The send()/yield-expression duo on the other hand is limping along, and someone like Michele who is definitely in the intended audience for the more arcane features of Python says that you can do it with a library. If that is possible shouldn't it have been the first step to put such a library into the stdlib and see how it fares? You have a point; I wasn't paying much attention when send() was first added, so I can't argue for it. I'm just referring you to material I happen to have handy that discusses use for it. -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
In article gsetb1$jop$0...@news.t-online.com, Peter Otten __pete...@web.de wrote: Generators at the moment seem to have turned into what in German we call an eierlegende Wollmilchsau*. One more point: there has always been a tension within the Python community between people pushing the bleeding edge and people who prefer to keep things simple. Unfortunately, the former group tends to be much more active. :-( There really needs to be a solid core of people who are fundamentally conservative. I like to think that I'm one of them (and probably so do many other people in the python-dev community), but each of us has our own hobby horses that we like to push, and none of us keeps completely on top of everything. -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
I started my commercial programming in Business Basic, (actually MAI Basic 4, and it's equivalent on primos (can't think of it's name at the moment) then later BBX (Basis) We ran the same code (all development on MAI, and then translated the few differences programatically between MAI and Prime) and moved the code via 1/4 tape to prime. This was general ledger, policy and claims systems for an Insurance Broker, we had about 300 + users on the two machines running over a wide area serial network) Then we moved to BBX on Unix. Whilst we had goto, no such thing as string arrays (until BBX) etc we really formally codified all of our devlopment standards, such that even line number ranges where for specific tasks (we had a limit of 64K per program, 1 - for line numbers) and all initialisation had to be in lines 1000 - 1099. We where only allowed to use goto within a routine and only as a last resort,. We could only have one return from a gosub, etc. on mai we could only have two letter or letter and digit variable names and they where global for the probram so if you wanted loop local, or subroutine variables you could safely use then x[1-9] and y[1-9] where safe, all initialisation setup use i[1-9] etc There where 3 programmers and we had to peer review everything. We built rock solid systems, if I say so myself ;-) You can write well structured and easily understood code in any language, it just takes more discipline in some environments more than others. Having said that I would hate to go back to it from Python ;-) See ya T On Apr 18, 4:52 am, a...@pythoncraft.com (Aahz) wrote: In article f222fcd3-56a4-4b2f-9bf8-3c9c17664...@e18g2000yqo.googlegroups.com, baykus baykusde...@gmail.com wrote: I am looking for one of those experimental languages that might be combination of python+basic. Now thta sounds weird and awkward I know. The reason I am asking is that I always liked how I could reference- call certain line number back in the days. It would be interesting to get similar functionality in Python. Why do you want to do that? Before you answer, make sure to read this: http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Conside... -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
sorry, but I was not replying to another thread. My mistake. happy hacking. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can some1 review my code?
When done all this you might feel it is not necessary to review the code any more, which is then is a good moment to actually request a review :-) I'll be happy to have a look at it though you might consider posting it here, more chance of useful feedback ;-) Great, Thanks a lot I will make sure that I complete what ever you have listed here and then request for a review. Well I understand that refusing to post the code here in the mailing list might annoy people and posting code here will only help it making it more robust and clean. I am just being cautious that I don't break any of the laws at my workplace. -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython 2.8 for Python 2.6 on Linux
On Sun, Apr 19, 2009 at 1:58 AM, Kenny x xarv...@gmail.com wrote: Hello, I use Ubuntu 8.10 and the latest version of Python. I started programming wxPython on my Windows computer, but now I have access to my ubuntu box, and want wxPython for 2.6 All the debs in the package manager are for 2.5, not 2.6 How can I Install wxPython for Python 2.6 without building from the source? Any help appreciated, I need this solved! :) -- http://mail.python.org/mailman/listinfo/python-list I don't know. Why don't you ask Ubuntu? How come you don't want to build from source? -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
stephane.bisin...@gmail.com (sb) wrote: sb I'll also file a bug report because I am more and more convinced this sb is a bug, if anything else at least in the documentation... I looked at it more closely, and I found that the Condition.wait is stuck on obtaining the GIL while the main thread executes the gobject main loop. Therefore it also blocks on notifications, not only on the timeout. It appears that GTK and Python threads are incompatible UNLESS you call gtk.gdk.threads_init() before gtk.main(). In your case you can do it after the import gtk in contact_list.py. Then it should work. By the way, I wonder why you need a timeout in your wait. I think the notifications should be sufficient to keep the gui updated. -- Piet van Oostrum p...@cs.uu.nl URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4] Private email: p...@vanoostrum.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
On Apr 19, 3:05 am, Hendrik van Rooyen m...@microcorp.co.za wrote: Aaron Brady casti.@gmail.com wrote: On Apr 18, 4:44 am, Hendrik van Rooyen m...@microcorp.co.za wrote: to untangle some spaghetti code. He did not mention if the spaghetti was actually doing it's job, bug free, which IMO is the only rational test for the quality of a piece I don't use 'rational' in the same way. Do you mean objective? Do readability, brevity, simplicity, purity, etc. contribute to quality? Is program quality equivalent (or identical) to code quality? This paragraph illustrates the problem, I think: Is there a significant difference between rational and objective? Define readability, brevity, simplicity, purity, etc as applied to the quality of a programme - it leads, inevitably, to a floundering around in a wash of words. It is an old philosopher's problem, that is, a problem of old philosophers: do all rational wo/men behave the same given the same situations, or more specifically, analogously given related situations? Rational and objective are related, I think. An objective test of code would be a process anyone can follow and derive the same result, such as how many identifiers it contains. A rational test involves some sort of abstraction of humans, such as what the ultimately rational human likes most, etc. Objective partial credit on an exam, for example, must come from a black-and-white rubric with exactly no room for interpretation. Rational partial credit could involve inferences, guesses, and context, esp. acquaintance with the taker. I agree that many of those traits are matters of degree and multi- dimensional. I am looking for an objective metric of code: code X has traits P, Q, and R. Period. It would probably be simpler to start describing code objectively, rather than trying to square-peg-round- hole existing words. However, there may be no objective test of especially large sizes of code, and may fall to some sort of interpretation or assessment of the most rational wo/man. If I disagree with your measuring of a code with objective criteria, we merely walk through the measurement, and resolve our disagreement from the criteria upon discovering it. If I disagree with your measuring of it with rational criteria, we have to take into account all sorts of trade-offs, such as long-short term, one-many readers, different consequences, etc. I'm speculating a little bit in defining those words. I advance that two equifunctional programs (same input- same output) can be compared w.r.t. brevity, to take an example, up to isomorphism of identifier names, control structures, and statement order. That is, we can determine how brief code X is, disregarding identifier names, and statement order where irrelevant. Control structure brevity might be something we're trying to measure: while 1: if cond(): break while not cond(): ... Are these equally brief, assuming they accomplish the same thing? If we don't have unanimous agreement on the answer to that question, we must conclude that even brevity is a composite trait and we'll have to start simpler. A theory of traits would have to make concrete predictions about *something*. If some code has trait P, it will Q. However, to stop playing Devil's Advocate, there is such a thing as code quality, but it cannot be defined, just like quality in general terms cannot be defined - as soon as you try, it turns to dross in your hands. Read Robert Pfirsig's Zen and the art of motorcycle maintenance for a full explanation of this effect. Are you saying that quality reduces to how pleasant a particular reader, or composite of multiple readers, finds the code? In the 1960s, programmers gave goto statements an average rating of 6 out of 10, 10 being most pleasing. In the 70s, that rating dropped to 5 out of 10. Subroutines were initially disliked, but came to be favored, advancing from 4/10 in the 60s to 7/10 in the 80s and on. Possible confounding variables include the increase in processor speed and thus the increased forgivingness of running time of gosubs; the prevalence of languages capable of generating subroutine calls; and the efficiency of the particular calls generated, surveys of which were not attempted. --Fabrication I do not agree with the reasoning that effectively says: If it is difficult to comprehend, it must be wrong Wrong no, but impractical, possibly or probably or almost certainly, notwithstanding the subject-dependence of ease of comprehension. Simple code is more future-resilient than that which is difficult to comprehend, even holding the language (version) constant. It is a I think that the emphasis on future proofing code is actually overrated. We try to code as if we are building pyramids, for all time, but the sad experience is that only a tiny percentage of application code written has a life of longer than about eight years. Project managers should, I judge, be versed in
Re: Passing all extra commandline arguments to python program, Optparse raises exception
On Thu, Apr 16, 2009 at 10:05 AM, sapsi saptarshi.g...@gmail.com wrote:
Hello,
Im using optparse and python 2.6 to parse some options, my commandline
looks like
prog [options] start|stop extra-args-i-will-pas-on
The options are --b --c --d
The extra options are varied are are passed onto another program e.g --
quiet --no-command , my program doesnt care what these are but instead
passes them onto another program.
I know these will always follow start|stop.
However optparse tries to process them and throws an exception - how
can i prevent this without placing all the extra-args in quotes.
In Linux (maybe in Windows) you can tell an application to stop
processing args by using '--'. Given this code:
import sys
from optparse import OptionParser
op = OptionParser()
op.add_option('--a', dest='a', action='store_true', default=False)
op.add_option('--b', dest='b', action='store_true', default=False)
opts, args = op.parse_args(sys.argv)
print 'opts:', opts
print 'args:', args
Here is an example use:
eee0:~% python junk.py --a -- --c
{'a': True, 'b': False}
['junk.py', '--c']
--
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek
--
http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
hi very sorry for that On Sun, 2009-04-19 at 14:50 +0200, News123 wrote: Hi, I think you got lost in the wrong thread. Though your subject line is correct your post threads under Is there a programming language, that . . . Perhaps you 'replied' to above thread and changed 'just' the subject line. Chances to get an answer might be higher if you repost your question without replying to an existing thread. I did not mean to do so, may be just missed out on removing the lines of the previous thread. sorry again. I hope this becomes a new thread now and I get some productive reply. happy hacking. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
On Apr 18, 8:29 pm, Piet van Oostrum p...@cs.uu.nl wrote: 2. Importing in a thread is discouraged. I think it is cleaner to put the import sys in the top of the module. Yes I know I shouldn't import inside of threads, but that is something that is going away, it's just for debugging this issue. On Apr 19, 2:31 pm, Piet van Oostrum p...@cs.uu.nl wrote: I looked at it more closely, and I found that the Condition.wait is stuck on obtaining the GIL while the main thread executes the gobject main loop. Therefore it also blocks on notifications, not only on the timeout. Ah-ha! My suspicions were right, then, I remembered something about gobject being incompatible with python threads... but I couldn't find anything in the docs, not even those of gobject, so I assumed my memory was failing me... It appears that GTK and Python threads are incompatible UNLESS you call gtk.gdk.threads_init() before gtk.main(). In your case you can do it after the import gtk in contact_list.py. Then it should work. I'll try to do that By the way, I wonder why you need a timeout in your wait. I think the notifications should be sufficient to keep the gui updated. The reason is simple: when first downloading the contactss list, I receive a swarm of *Updated() calls, so if I redraw every time I get a very bad visual effect and I waste a lot of CPU redrawing something that will change in a very very short time. Hence the time constraint... I couldn't come up with something smarter, so... Anyway I wanted to really thank you for your time and your precious advice, I really appreciate it! -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
On Apr 19, 2:31 pm, Piet van Oostrum p...@cs.uu.nl wrote: It appears that GTK and Python threads are incompatible UNLESS you call gtk.gdk.threads_init() before gtk.main(). In your case you can do it after the import gtk in contact_list.py. Then it should work. Ok here's the deal: I'm not ending up in the gtk frontend. My code is for the ncurses frontend, so there is no import gtk and gtk.main() that gets executed in that case. But it is definitely around the gobject thing, I'll try to search for this! -- http://mail.python.org/mailman/listinfo/python-list
wxPython 2.8 for Python 2.6
I hate building from the source. Especially when wxPython has all these flags and I don't know what they mean. Is there any way? I hate building from the source, and want to use Python 2.6 with wxPython 2.8 -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
On Apr 19, 3:14 pm, stephane.bisin...@gmail.com wrote: Ok here's the deal: I'm not ending up in the gtk frontend. My code is for the ncurses frontend, so there is no import gtk and gtk.main() that gets executed in that case. But it is definitely around the gobject thing, I'll try to search for this! gobject.threads_init() is what was missing, now everything works as expected! Thanks! -- http://mail.python.org/mailman/listinfo/python-list
imaplib and smtplib
I want to download a message from my Gmail inbox with imaplib, then forward (basically resend it) with smtplib. I can log in with both. I just need to know how to download a message with imaplib, and what needs to be converted into what to be able to send it with smtplib. For a good time, go to Start:Run and type in format Chttp://www.vistro.net/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Useful MySQL Routines
Lawrence D'Oliveiro wrote: In message mailman.4148.1240135989.11746.python-l...@python.org, Tino Wildenhain wrote: Lawrence D'Oliveiro wrote: I've done a writeup on some of the basic routines I frequently use here http://codecodex.com/wiki/index.php?title=Useful_MySQL_Routines. Why is that specific to mysql? Because that's all I've used so far. Though sqlite looks interesting for single-user stuff... There are other more powerfull free alternatives to MySQL as well :) Btw, the bulkinserter could be better done by using executemany and select usefull batch sizes. Hmm, I've never bothered with executemany. The code as written copes comfortably with 10,000 records or so. Would be interesting to see the difference. However executemany would be much more portable - and as I see it transfers at least a bit less data over the wire. If you allow query construnction better don't forget appropriate quoting of table- and column names too to be on the safe side. Hmm, I never worried about that, because I was I tried to be careful in the names I chose. And I've never allowed object names to come from user input :). Not you, but if others use it, it might be that they don't see a problem and then - oops :) Besides, how do you deal with characters that are still illegal when quoted http://dev.mysql.com/doc/refman/5.0/en/identifiers.html? Don't know. I personally avoid dealing with mysql altogether (I mean, commands hidden in sql comments? Heaven! :) Cheers Tino -- http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
On Sun, Apr 19, 2009 at 09:55:08AM EDT, Krishnakant wrote: hi very sorry for that On Sun, 2009-04-19 at 14:50 +0200, News123 wrote: Hi, I think you got lost in the wrong thread. Though your subject line is correct your post threads under Is there a programming language, that . . . Perhaps you 'replied' to above thread and changed 'just' the subject line. Chances to get an answer might be higher if you repost your question without replying to an existing thread. I did not mean to do so, may be just missed out on removing the lines of the previous thread. sorry again. I hope this becomes a new thread now and I get some productive reply. happy hacking. Krishnakant. No big deal, mature mailers such as mutt let you break threads into subthreads via a painless Alt-B. CJ -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
Hendrik van Rooyen wrote: Mensanator mens...@aol.com wrote: 8 -- description of bugs in spaghetti --- Looks like that design really needed sorting out! A programmer once said to me Why should I run it, I know how it works, I wrote it. Are you serious? In my opinion, anybody who says this is not a programmer, but merely an arrogant idiot with a lot of misplaced self- confidence - somewhat like a permanent force corporal. My reply: You only THINK you know how it works. _I_, on the other hand, ACTUALLY know how it works because I've run it. How did you manage to keep your reply so meek? You must be a really well brought up person. :-) Possibly because the proper reply was probably, You only THINK you know how it works. _I_, on the other hand, know how it behaves, even if I don't know how it was supposed to work. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
Hendrik van Rooyen wrote: In my defense of the goto, I would like to make clear that I do not support its use to produce spaghetti. In general, muddled thinking, coupled with expediency, is what I think are the true precursors of spaghetti code. The goto is an innocent tool that can be used for good or evil. The goto is a sharp, spiky dangerous tool that seduces people into thinking of using it far too often. It should be used with the same respect you approach beautiful well- armed people of questionable morals who you find attractive. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
In article 6c04c7da-6b54-4a49-803f-aac3126e3...@f19g2000yqh.googlegroups.com, stephane.bisin...@gmail.com wrote: On Apr 18, 8:29=A0pm, Piet van Oostrum p...@cs.uu.nl wrote: By the way, I wonder why you need a timeout in your wait. I think the notifications should be sufficient to keep the gui updated. The reason is simple: when first downloading the contactss list, I receive a swarm of *Updated() calls, so if I redraw every time I get a very bad visual effect and I waste a lot of CPU redrawing something that will change in a very very short time. Hence the time constraint... I couldn't come up with something smarter, so... The redraw thread should keep track of the last time it did a redraw; each time it receives an update event, it should check to see whether it has been more than a specified period of time since the last redraw. -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
On Sun, Apr 19, 2009 at 04:35:27AM EDT, Hendrik van Rooyen wrote: Brian Blais wrote: On Apr 18, 2009, at 5:44 , Hendrik van Rooyen wrote: to untangle some spaghetti code. He did not mention if the spaghetti was actually doing it's job, bug free, which IMO is the only rational test for the quality of a piece of code, because it is the reason for its existence. The aesthetics are, like all aesthetics, a matter of opinion. Actually, I strongly disagree with this statement. In my experience, there has been very very few pieces of code that I've written that I hadn't wanted to *modify* at some point: extend it to a new set of circumstances, cover a different case, change the output, etc... The quality of a piece of code is not just if it works right now, but if you can reasonably extend it for the future. +1 .. obfuscated code never remains bug-free for long. Your experience is different from mine - in what I mostly do, which is struggling around in embedded assembler, by the time the thing works it is stable, and I very seldom have to go back to fiddle with it. Intellectually, assembler programming is the less demanding since its level of abstraction does not go any further than mapping a few binary numbers to a small set of usually well-chosen mnemonics. Unless it features a powerful macro-language that lets the apprentice create his own high-level patois on top of the assembler, that is. On the other hand, I understand what you are talking about, but I think that the origen of the frustration that one feels when having to battle with some old code, is actually inside oneself - the code is the same, but I have changed, and I am no longer the same as I was when I wrote it. I toyed with Perl for a year or so, but couldn't give it my full attention. As a result, every few weeks when I wanted to modify what I wrote, I had to re-learn the code all over again because the syntax was so terse. The same is true for the typical use of a goto: you have to relearn the program, because the flow jumps around. It's not just about aesthetics, but about being able to work with a piece of code. In my defense of the goto, I would like to make clear that I do not support its use to produce spaghetti. In general, muddled thinking, coupled with expediency, is what I think are the true precursors of spaghetti code. The goto is an innocent tool that can be used for good or evil. How true. At least goto's have the merit of naming their target. I have dealt with C code built on the original author's partiality for 200-line+ nested loops where it looked like every other line or so was either a break or a continue, goto's without the name that don't clearly state where they are going. Thank goodness he was not familiar with setjmp/longjmp. :-) CJ -- http://mail.python.org/mailman/listinfo/python-list
Python interpreter speed
Hi. Standard Python interpreter's implementation is written in C language. C code while compilation, is compilled into machine code (the fastest code). Python code is compiled into into byte-code which is also some sort of fast machine code. So why Python interpreter is slower than Java VM? Being written in C and compilled into machine code, it should be as fast as C/Asm code. What's wrong with that? Greets and thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
Chris Jones wrote: On Sun, Apr 19, 2009 at 04:35:27AM EDT, Hendrik van Rooyen wrote: Brian Blais wrote: [snip] In my defense of the goto, I would like to make clear that I do not support its use to produce spaghetti. In general, muddled thinking, coupled with expediency, is what I think are the true precursors of spaghetti code. The goto is an innocent tool that can be used for good or evil. How true. At least goto's have the merit of naming their target. Except in (classic) Pascal where they are unsigned integers (they still need to be declared). I have dealt with C code built on the original author's partiality for 200-line+ nested loops where it looked like every other line or so was either a break or a continue, goto's without the name that don't clearly state where they are going. Thank goodness he was not familiar with setjmp/longjmp. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python interpreter speed
I don't mean to start a flame war, but a productive debate will be wonderful. I have been writing heavy applications in java for a few years untill recent past. My experience is that python is not just fast but also zippy and smooth when it comes to running the applications. Infact I have a couple of softwares which were re coded in python for this very reason. So I would like to know real facts on this arguement. Let me mention that out of these 2 apps one is a distributed application with an rpc layer and other is a normal back and front end database driven software. both have heavy load on them and do a lot of number crunching and complex calculations. happy hacking. Krishnakant. On Sun, 2009-04-19 at 18:11 +0200, Ryniek90 wrote: Hi. Standard Python interpreter's implementation is written in C language. C code while compilation, is compilled into machine code (the fastest code). Python code is compiled into into byte-code which is also some sort of fast machine code. So why Python interpreter is slower than Java VM? Being written in C and compilled into machine code, it should be as fast as C/Asm code. What's wrong with that? Greets and thank you. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyxser-0.2r --- Python XML Serialization
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Stefan Behnel stefan...@behnel.de on Sunday 19 April 2009 02:25 wrote in comp.lang.python: Daniel Molina Wegener wrote: * Every serilization is made into unicode objects. Hmm, does that mean that when I serialise, I get a unicode object back? What about the XML declaration? How can a user create well-formed XML from your output? Or is that not the intention? Yes, if you serialize an object you get an XML string as unicode object, since unicode objects supports UTF-8 and some other encodings. Also you can deserialize the object --- I mean convert the XML back to python object tree. Take a look on the serializer output: http://coder.cl/software/pyxser/#id_example Stefan Best regards, - -- .O. | Daniel Molina Wegener | FreeBSD Linux ..O | dmw [at] coder [dot] cl | Open Standards OOO | http://coder.cl/| FOSS Developer -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (FreeBSD) iQIcBAEBCgAGBQJJ61B1AAoJEHxqfq6Y4O5N3qEQANT07GTyO17rFGMRhVsQ9IzK qKcJl7tv15dYnLjJ+TPLRJ44ENPbQfUfrSevsY6ZTKK+MEqKcUej+41JKwImc8RT GDILehrn1SgttALryKJyZlIWFFoVlIHflJL883bUd1S2nppY9yz5o9wBoq98KIbt Rs3Azb8ZxVE9yABDQJbKhsBPZfa65wEzQo+MeDI+2xz301Rr9EttPJCFLMJFBeBt 0uvhwGXHOTKLwGsOOf//T1XNpg14QouEJJKGC1LjTSfAWvcXKsKdgLu4aAn6JGtW zHqG2Uw3LvpBjgCwA5i1CTpmJxx8HhrDmVQyO6jdw65j5Ms9nCFD3BSezvvuYwtd bvd0L7cHx/9TwGRifDDhAhBjdqR8lX8XyK8VSaNpjyf0ZCPmXk+AIDgINGzk2bG3 CkC8VfFDRJubwX0tFbtqXx8A1M7s5pu4DMdi8e9h5Bw+b/qfC0hCHIB7bViq2gH1 ELsC0xoffW1LxxowqjDlMDK1FymTLmErssQ7qCFLXBzxS7UHCcRMwKC+9v/NAbyU wUuQNxRPASYnvfxVyQJdAurK9NNXQ5A58fclli6H/5Su+knDxOElXZ4ZMJt2Bbdg 9W2l99rBL1n50pfwiLezeRH3fhDXByNZiAPO2+ahdyDjyMekc/kqtTD898v841oG UJyGm+fyw/kxEpI0R3E5 =mXFf -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
On Apr 19, 4:50 pm, a...@pythoncraft.com (Aahz) wrote: The redraw thread should keep track of the last time it did a redraw; each time it receives an update event, it should check to see whether it has been more than a specified period of time since the last redraw. That's what I do ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python interpreter speed
Hello I'm not expert in low level languages, but I'd say that Python and Java are compiled to bytecodes of similar level. The difference lies in the information contained in those bytecodes : java is statically typed, so attribute access and other basic operations are rather quick, allowing few levels of indirection. Whereas a python attribute lookup can involve a big number of operations (browsing the inheritance tree, querying __getattribute__, __get__ and all those magic methods...). That's in this magic of python that we have a loss of performance I think - that's both the power and the drawback of this (awesome) language. Regards, Pascal PS : I guess core python developpers will have much more accurate things to say about it ^^ Ryniek90 a écrit : Hi. Standard Python interpreter's implementation is written in C language. C code while compilation, is compilled into machine code (the fastest code). Python code is compiled into into byte-code which is also some sort of fast machine code. So why Python interpreter is slower than Java VM? Being written in C and compilled into machine code, it should be as fast as C/Asm code. What's wrong with that? Greets and thank you. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
The Python standard library and PEP8
Hi there, Exploring the Python standard library, I was surprised to see that several packages (ConfigParser, logging...) use mixed case for methods all over the place. I assume that they were written back when the Python styling guidelines were not well-defined. Given that it's rather irritating (not to mention violating the principle of least surprise) to have this inconsistency, wouldn't it make sense to clean up the API by marking old-style, mixed-case methods as deprecated (but keep them around anyway) and add equivalent methods following the lowercase_with_underscores convention? On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
On Apr 19, 3:51�am, Hendrik van Rooyen m...@microcorp.co.za wrote: Mensanator mens...@aol.com wrote: 8 -- description of bugs in spaghetti --- Looks like that design really needed sorting out! Since I was translating to Pascal, I couldn't emulate that code if I wanted to. A programmer once said to me Why should I run it, I know how it works, I wrote it. Are you serious? Absolutely. In my opinion, anybody who says this is not a programmer, but merely an arrogant idiot with a lot of misplaced self- confidence - somewhat like a permanent force corporal. That might have contributed to the reason why we din't sell too many systems. The last product developed ran on an IBM RISC PC using the PICK operating system. We sold nearly one. My reply: You only THINK you know how it works. _I_, on the other hand, ACTUALLY know how it works because I've run it. How did you manage to keep your reply so meek? He got paid more than I did. You must be a really well brought up person. :-) But not behind their backs. A program I created that tested anuther programmer's attempt at making a hash table was labeled HASHIT. Said programmer was long gone when the customer called and wanted to know why his 1 record database was saying it was full when only 3000 employees had been entered. Turned out that the hashing algorithm could not access any more than 3000 of the 1 available records. This isn't the kind of thing Field Service is supposed to have to deal with. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python andBasic?
On Apr 19, 10:12�am, Scott David Daniels scott.dani...@acm.org wrote: Hendrik van Rooyen wrote: Mensanator mens...@aol.com wrote: 8 -- description of bugs in spaghetti --- Looks like that design really needed sorting out! A programmer once said to me Why should I run it, I know how it works, I wrote it. Are you serious? In my opinion, anybody who says this is not a programmer, but merely an arrogant idiot with a lot of misplaced self- confidence - somewhat like a permanent force corporal. My reply: You only THINK you know how it works. _I_, on the other hand, ACTUALLY know how it works because I've run it. How did you manage to keep your reply so meek? You must be a really well brought up person. :-) Possibly because the proper reply was probably, You only THINK you know how it works. _I_, on the other hand, know how it behaves, even if I don't know how it was supposed to work. Probably more accurate as his .exe file crashed immediately when executed. That's what lead me to supect he never ran it. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
print as a function in 2.5 ?
hello,
For several reasons I still use Python version 2.5.
I understand that the print-statement will be replaced in Python version
3.0.
At the moment I want to extend the print statement with an optional
traceback.
So I've 2 options:
1- make a new function, like eprint (), where e stands for extended
print
2- make a function print() that has the extended features
Now I guess that one of the reasons to change print from a statement to
a function,
is the option to override and extend it.
If that's so, choice 2 would be the best choice.
Is that assumption correct ?
Suppose the second choice is the best,
I can now create a function print,
and have the best of 2 worlds, get my extension and being prepared for
the future.
def print ( *args ) :
for arg in args :
print arg,
print (' Print Traceback ')
do_extended printer actions
Now doesn't seem to be allowed,
nor is there an import from __future__ :-(
What's the best solution (other than moving to 2.6 or up ?
thanks,
Stef Mientki
--
http://mail.python.org/mailman/listinfo/python-list
Interest in generational GC for Python
Hello, Is there any interest in generational garbage collection in Python these days ? Anyone working on it ? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
On Sun, 19 Apr 2009 09:09:07 -0400, D'Arcy J.M. Cain wrote: On Sun, 19 Apr 2009 05:08:32 GMT Zaphod zap...@beeblebrox.net wrote: Friend of mine made a really nice asm development environment for his home made OS. Too bad he didn't have any marketing skills. Was your friend's name Gary Kildall? :-) Nope - Craig Carmichael. The OS was originally called OMEN but later changed to Oases and was initially designed to run on 68k based machines. Craig just loves 68k assembly - less hair pulling required than x86. -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
I agree that there are still some styling inconsistencies in python stdlib, but I'm not advocating a cleaning because I've always found camelCase much prettier than those multi_underscore_methods :p Concerning the length property of strings, isn't the __len__() method sufficient ? I know they're not usual in OOP languages, but builtins like len() and iter() might be better anyway, since they deal with some magical problems (CF special attributes lookups in the python documentation) Regards, Pascal Emmanuel Surleau a écrit : Hi there, Exploring the Python standard library, I was surprised to see that several packages (ConfigParser, logging...) use mixed case for methods all over the place. I assume that they were written back when the Python styling guidelines were not well-defined. Given that it's rather irritating (not to mention violating the principle of least surprise) to have this inconsistency, wouldn't it make sense to clean up the API by marking old-style, mixed-case methods as deprecated (but keep them around anyway) and add equivalent methods following the lowercase_with_underscores convention? On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: print as a function in 2.5 ?
Stef Mientki wrote: Now doesn't seem to be allowed, nor is there an import from __future__ :-( What's the best solution (other than moving to 2.6 or up ? The word 'print' is a reserved word like is, class or def. You can't have a function named 'print' in Python 2.5. You have to call your function eprint() or print_(). Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
En Sun, 19 Apr 2009 13:43:10 -0300, Emmanuel Surleau emmanuel.surl...@gmail.com escribió: Exploring the Python standard library, I was surprised to see that several packages (ConfigParser, logging...) use mixed case for methods all over the place. I assume that they were written back when the Python styling guidelines were not well-defined. The name policy changed in March 2004. Before that, PEP8 said: Function Names Plain functions exported by a module can either use the CapWords style or lowercase (or lower_case_with_underscores). There is no strong preference, but it seems that the CapWords style is used for functions that provide major functionality (e.g. nstools.WorldOpen()), while lowercase is used more for utility functions (e.g. pathhack.kos_root()). The current version says: Function Names Function names should be lowercase, with words separated by underscores as necessary to improve readability. mixedCase is allowed only in contexts where that's already the prevailing style (e.g. threading.py), to retain backwards compatibility. Given that it's rather irritating (not to mention violating the principle of least surprise) to have this inconsistency, wouldn't it make sense to clean up the API by marking old-style, mixed-case methods as deprecated (but keep them around anyway) and add equivalent methods following the lowercase_with_underscores convention? The threading module has such aliases, but there are no plans for mass renaming all the stdlib that I know of. You'll have to live with this inconsistency. On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Why would it be nice to have? I never missed it... -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: print as a function in 2.5 ?
Hello,
I had found some article on this some months ago, can't remember where
exactly...
But if you don't want harassments, I'd just advise you to create a
function with a properly specific name (like exprint()), and to make
it mimic closely the signature and behaviour of Py3k's print() function.
That way, if one day you switch to upper versions, a simple mass text
replacing operation on all your files will do it in an instant B-)
Regards,
Pascal
Stef Mientki a écrit :
hello,
For several reasons I still use Python version 2.5.
I understand that the print-statement will be replaced in Python
version 3.0.
At the moment I want to extend the print statement with an optional
traceback.
So I've 2 options:
1- make a new function, like eprint (), where e stands for
extended print
2- make a function print() that has the extended features
Now I guess that one of the reasons to change print from a statement
to a function,
is the option to override and extend it.
If that's so, choice 2 would be the best choice.
Is that assumption correct ?
Suppose the second choice is the best,
I can now create a function print,
and have the best of 2 worlds, get my extension and being prepared for
the future.
def print ( *args ) :
for arg in args :
print arg,
print (' Print Traceback ')
do_extended printer actions
Now doesn't seem to be allowed,
nor is there an import from __future__ :-(
What's the best solution (other than moving to 2.6 or up ?
thanks,
Stef Mientki
--
http://mail.python.org/mailman/listinfo/python-list
--
http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
On Apr 19, 7:37 pm, Gabriel Genellina gagsl-...@yahoo.com.ar wrote: The threading module has such aliases, but there are no plans for mass renaming all the stdlib that I know of. You'll have to live with this inconsistency. It's been fixed in Python 3.0! -- Paul Hankin -- http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
En Sun, 19 Apr 2009 08:16:15 -0300, Krishnakant hackin...@gmail.com escribió: I need to create an installer and an executable file for my python program for gnu/linux. The install script has to put the package into site-packages folder where all other libraries reside. Then put the executable file into /usr/bin as other files. Write a setup.py script using the distutils package: http://docs.python.org/distutils/index.html I believe putting files into proper places is pritty easy (may be some one will instantly reply to the issue of putting the executable file and libraries in place ). But to do the database based activities, I need python-psycopg2 module for postgresql in the first place. So is it possible for python to self download and install all the necessary modules on to the client machine? You said you want to create a .deb -- list the required dependencies there. Even regarding the executable, I am confused on using bash as the script for writing the executable which can then do some thing like python -c and call the modules, or write this executable code in a main.py and put that file into the executable path i.e /usr/bin. I've seen both a bash script with a single line: python path/to/main.py, and a Python script that just imports some modules and then calls the main function. Perhaps bash is more useful if your program (or any library) requires some environment variables to be set. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
En Sun, 19 Apr 2009 14:52:23 -0300, Paul Hankin paul.han...@gmail.com escribió: On Apr 19, 7:37 pm, Gabriel Genellina gagsl-...@yahoo.com.ar wrote: The threading module has such aliases, but there are no plans for mass renaming all the stdlib that I know of. You'll have to live with this inconsistency. It's been fixed in Python 3.0! What do you mean fixed? Python 3.0.1 (r301:69561, Feb 13 2009, 20:04:18) [MSC v.1500 32 bit (Intel)] on win32 Type help, copyright, credits or license for more information. from threading import Thread t = Thread() t.name = foo t.getName() 'foo' t.setName(bar) t.name 'bar' Both the old camelCase methods and the new property are still there. They're not even deprecated yet. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of PythonandBasic?
Chris Jones wrote: ... Intellectually, assembler programming is the less demanding since its level of abstraction does not go any further than mapping a few binary numbers to a small set of usually well-chosen mnemonics. Unless it features a powerful macro-language that lets the apprentice create his own high-level patois on top of the assembler, that is. No, I've dealt with an assembler named 'SLOE' that had an elaborate mechanism for laying out code in memory in a way that the CPU would be happy with. Between that and the instruction prefect, the thing was famously called immune to programming. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
stephane.bisin...@gmail.com (sb) wrote: By the way, I wonder why you need a timeout in your wait. I think the notifications should be sufficient to keep the gui updated. sb The reason is simple: when first downloading the contactss list, I sb receive a swarm of *Updated() calls, so if I redraw every time I get a sb very bad visual effect and I waste a lot of CPU redrawing something sb that will change in a very very short time. Hence the time sb constraint... I couldn't come up with something smarter, so... while time.time() - t 0.5 or not self._modified: print sys.stderr, Going to sleep\n self._mod_lock.wait(timeout=1) print sys.stderr, Ok time to see if we must repaint self.__repaint() t = time.time() But the timeout thing will continue after that, so you have a continuous polling loop which wastes some CPU time. I think what you want can be more easily achieved by doing a sleep(0.5) before the outer while loop, i.e. as the first statement in __thread_run. -- Piet van Oostrum p...@cs.uu.nl URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4] Private email: p...@vanoostrum.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Interest in generational GC for Python
Borked Pseudo Mailed wrote: Hello, Is there any interest in generational garbage collection in Python these days ? Anyone working on it ? Thanks Not really all that useful for CPython (you cannot move live objects, without breaking faith with C-coded extensions). PyPy would be where to look for that work (and perhaps FePy or unladen swallow). --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Overriding methods per-object
On Apr 18, 9:43 pm, Aaron Brady castiro...@gmail.com wrote: On Apr 17, 9:41 pm, Steven D'Aprano st...@remove-this- cybersource.com.au wrote: On Fri, 17 Apr 2009 18:22:49 -0700, Pavel Panchekha wrote: I've got an object which has a method, __nonzero__ The problem is, that method is attached to that object not that class a = GeneralTypeOfObject() a.__nonzero__ = lambda: False a.__nonzero__() False But: bool(a) True What to do? (1) Don't do that. (2) If you *really* have to do that, you can tell the class to look at the instance: class GeneralTypeOfObject(object): def __nonzero__(self): try: return self.__dict__['__nonzero__'] except KeyError: return something snip I think you need to call the return, unlike you would in '__getattr__'. return self.__dict__['__nonzero__']( ) You're free to use a different name for the method too. return self.custom_bool( ) And you don't even have to implement an ABC. Er... /have/ to, that is. I got it working. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
On Sunday 19 April 2009 19:37:59 Gabriel Genellina wrote: En Sun, 19 Apr 2009 13:43:10 -0300, Emmanuel Surleau emmanuel.surl...@gmail.com escribió: Exploring the Python standard library, I was surprised to see that several packages (ConfigParser, logging...) use mixed case for methods all over the place. I assume that they were written back when the Python styling guidelines were not well-defined. The name policy changed in March 2004. Before that, PEP8 said: Function Names Plain functions exported by a module can either use the CapWords style or lowercase (or lower_case_with_underscores). There is no strong preference, but it seems that the CapWords style is used for functions that provide major functionality (e.g. nstools.WorldOpen()), while lowercase is used more for utility functions (e.g. pathhack.kos_root()). The current version says: Function Names Function names should be lowercase, with words separated by underscores as necessary to improve readability. mixedCase is allowed only in contexts where that's already the prevailing style (e.g. threading.py), to retain backwards compatibility. Ah, that makes sense. Given that it's rather irritating (not to mention violating the principle of least surprise) to have this inconsistency, wouldn't it make sense to clean up the API by marking old-style, mixed-case methods as deprecated (but keep them around anyway) and add equivalent methods following the lowercase_with_underscores convention? The threading module has such aliases, but there are no plans for mass renaming all the stdlib that I know of. You'll have to live with this inconsistency. Damn. On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Why would it be nice to have? I never missed it... First off, it's pretty commonplace in OO languages. Secondly, given the number of methods available for the string objects, it is only natural to assume that dir(a) would show me a len() or length() or size() method. Having to use a function for such a mundane operation feels unnatural and not OO. Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] pyxser-0.2r --- Python XML Serialization
Daniel Molina Wegener wrote: Stefan Behnel stefan...@behnel.de on Sunday 19 April 2009 02:25 wrote in comp.lang.python: Daniel Molina Wegener wrote: * Every serilization is made into unicode objects. Hmm, does that mean that when I serialise, I get a unicode object back? What about the XML declaration? How can a user create well-formed XML from your output? Or is that not the intention? Yes, if you serialize an object you get an XML string as unicode object, since unicode objects supports UTF-8 and some other encodings. That's not what I meant. I was wondering why you chose to use a unicode string instead of a byte string (which XML is defined for). If your only intention is to deserialise the unicode string into a tree, that may be acceptable. However, as soon as you start writing the data to a file or through a network pipe, or pass it to an XML parser, you'd better make it well-formed XML. So you either need to encode it as UTF-8 (for which you do not need a declaration), or you will need to encode it in a different byte encoding, and then prepend a declaration yourself. In any case, this is a lot more overhead (and cumbersome for users) than writing out a correctly serialised byte string directly. You seemed to be very interested in good performance, so I don't quite understand why you want to require an additional step with a relatively high performance impact that only makes it harder for users to use the tool correctly. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: PEP 401
alessiogiovanni.bar...@gmail.com wrote: Are 19 days that I read this PEP; it's all true? Yep. Actually, the Cython project was lucky that the FLUFL did not recognise it as an alternative implementation of Python. That way, we can easily finish up world domination, say, 10-20 years before Python on Parrot reaches 2.7 feature completeness. Stefan -- http://mail.python.org/mailman/listinfo/python-list
Re: How to create a virtual serial port?
Grant Edwards gra...@visi.com wrote: On 2009-04-12, JanC use...@janc.invalid wrote: Grant Edwards wrote: On 2009-04-10, Stuart Davenport stuart.davenp...@gmail.com wrote: I am trying to work out if its possible, to create a virtual serial port with Python? On Linux: no. I wonder if there is no way to emulate ptys from userspace? Didn't I just answer that question? On Linux: no. Actually you could do it with an LD_PRELOAD library Intercept open(/dev/ttyS0,...). You'd need to intercept ioctl(), read(), write(), close() etc too. Messy but possible. -- Nick Craig-Wood n...@craig-wood.com -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
How can I get path/name of the softlink to my python script when executing it
Hi, I am writiing a script say wabexec in python I will then have softlinks from other softlinks like ls, waf,hello, etc that are in the same directory and pointing to wabexec. When some executes ./waf or ./hello and wabexec gets invoked because of the softlink, how do I find out from within wabexec how it was invoked? was it throug waf or hello, etc. both __file__ and sys.arg0[] seem to have wabexec not the name of the softlink. Any ideas? Sarvi -- http://mail.python.org/mailman/listinfo/python-list
Re: Condition.wait(0.5) doesn't respect it's timeout
On Apr 19, 7:21 pm, Piet van Oostrum p...@cs.uu.nl wrote: while time.time() - t 0.5 or not self._modified: print sys.stderr, Going to sleep\n self._mod_lock.wait(timeout=1) print sys.stderr, Ok time to see if we must repaint self.__repaint() t = time.time() But the timeout thing will continue after that, so you have a continuous polling loop which wastes some CPU time. I think what you want can be more easily achieved by doing a sleep(0.5) before the outer while loop, i.e. as the first statement in __thread_run. Two boolean checks every half second is not a great waste; but thinking about your solution I've come to agree that it is smarter and more effective. Thank you again! -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
Emmanuel Surleau wrote: First off, it's pretty commonplace in OO languages. Secondly, given the number of methods available for the string objects, it is only natural to assume that dir(a) would show me a len() or length() or size() method. Having to use a function for such a mundane operation feels unnatural and not OO. If you replace the term OO with Java in your posting, then I'm going to agree with you. Neither Java nor Python are pure object oriented languages. A while ago a friend of mine called Java a class centric programming language. I think that describes Java's coding philosophy very good. Python has a different coding philosphy. You can't assume that Java style development works with Python (and vice versa). Now to your rant about len(). Python class may implement several protocols with magic methods like __len__(), __iter__() or __getitem__(). The magic methods start and begin with two _. When a method implements the __len__() method then it supports len(). In Python readability counts. Try import this in a Python shell. PEP 8 is a coding guideline for the standard library. It's not a law. Some modules are older than the PEP, other modules and libraries were developed outside the core and added later. We had a long discussion about PEP8'ing more code but eventually we decided against it. More chances would break too much 3rd party code. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
En Sun, 19 Apr 2009 15:41:02 -0300, Emmanuel Surleau emmanuel.surl...@gmail.com escribió: On Sunday 19 April 2009 19:37:59 Gabriel Genellina wrote: En Sun, 19 Apr 2009 13:43:10 -0300, Emmanuel Surleau On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Why would it be nice to have? I never missed it... First off, it's pretty commonplace in OO languages. Secondly, given the number of methods available for the string objects, it is only natural to assume that dir(a) would show me a len() or length() or size() method. Having to use a function for such a mundane operation feels unnatural and not OO. Perhaps in statically typed languages. Python is dynamic, so a x.length() requires a method lookup and that's expensive. len(x) on the contrary, can be optimized on a case by case basis -- it DOESN'T translate to x.__len__() as some might think. See http://www.python.org/doc/faq/general/#why-does-python-use-methods-for-some-functionality-e-g-list-index-but-functions-for-other-e-g-len-list On a side note, there is an alternative to dir(), more human-friendly: http://inky.github.com/see/ py see(a) ? [] in + * % = == != = len() .capitalize() .center() .count() .decode() .encode() .endswith() .expandtabs() .find() .format() .index() .isalnum() .isalpha() .isdigit() .islower() .isspace() .istitle() .isupper() .join() .ljust() .lower() .lstrip() .partition() .replace() .rfind() .rindex() .rjust() .rpartition() .rsplit() .rstrip() .split() .splitlines() .startswith() .strip() .swapcase() .title() .translate() .upper() .zfill() You can see len() there. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: print as a function in 2.5 ?
Stef Mientki wrote: hello, For several reasons I still use Python version 2.5. I understand that the print-statement will be replaced in Python version 3.0. At the moment I want to extend the print statement with an optional traceback. So I've 2 options: 1- make a new function, like eprint (), where e stands for extended print 2- make a function print() that has the extended features There is a 3rd option: hook yourself in the output stream and just climb the call stack in the write() method. This works (done that myself for easy debugging) The other way if you want to selectively do so, either use a form of log (because why must it be print if the output is debugging information?) or instead of hooking sys.stdout, use another output stream and print debug, ... to it. Regards Tino -- http://mail.python.org/mailman/listinfo/python-list
Re: print as a function in 2.5 ?
Tino Wildenhain wrote: Stef Mientki wrote: hello, For several reasons I still use Python version 2.5. I understand that the print-statement will be replaced in Python version 3.0. At the moment I want to extend the print statement with an optional traceback. So I've 2 options: 1- make a new function, like eprint (), where e stands for extended print 2- make a function print() that has the extended features There is a 3rd option: hook yourself in the output stream and just climb the call stack in the write() method. This works (done that myself for easy debugging) The other way if you want to selectively do so, either use a form of log (because why must it be print if the output is debugging information?) or instead of hooking sys.stdout, use another output stream and print debug, ... to it. thanks guys, for the moment I'll stick to another name v3print so it can easily be replaced. The third option (by Tino) looks interesting, but is not suitable in my case, because the program I'm writing is a kind of IDE (Integrated Development Environment), where the user can create programs, and must have full control over stdout. cheers, Stef Regards Tino -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
On Apr 19, 11:41 am, Emmanuel Surleau emmanuel.surl...@gmail.com wrote: First off, it's pretty commonplace in OO languages. Secondly, given the number of methods available for the string objects, it is only natural to assume that dir(a) would show me a len() or length() or size() method. Having to use a function for such a mundane operation feels unnatural and not OO. My advice in this situation is to think of len() as an operator that has the syntax of a regular function. Apart from not having special syntax, len() is no different from any other operator. It has an associated method, __len__(), that allows objects to customize their behavior when the operator is applied to them. As to why they made len() and operator, it is really just a language design decision. By making len() into a function, rather than a method, GvR was essentially saying, Determining length of a sequence is a common and familiar enough operation that it deserves status above a mere method call, even if we don't have a special syntax for it. I am not, mind you, arguing either for or against len being an operator (I don't really think it matters much either way); I'm just saying there is a rationale behind it. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
In article mailman.4175.1240166489.11746.python-l...@python.org, Emmanuel Surleau emmanuel.surl...@gmail.com wrote: On Sunday 19 April 2009 19:37:59 Gabriel Genellina wrote: En Sun, 19 Apr 2009 13:43:10 -0300, Emmanuel Surleau emmanuel.surl...@gmail.com escribi=F3: On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! Why would it be nice to have? I never missed it... First off, it's pretty commonplace in OO languages. What makes you think Python is an OO language? What kind of OO language allows you to do this: def square(x): return x*x for i in range(10): print square(x) -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ If you think it's expensive to hire a professional to do the job, wait until you hire an amateur. --Red Adair -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
Perhaps in statically typed languages. Python is dynamic, so a x.length() requires a method lookup and that's expensive. len(x) on the contrary, can be optimized on a case by case basis -- it DOESN'T translate to x.__len__() as some might think. See http://www.python.org/doc/faq/general/#why-does-python-use-methods- for-some -functionality-e-g-list-index-but-functions-for-other-e-g-len-list I don't know... the gist of the FAQ you link to is that's legacy code and we don't want to change it in order not to break code. It doesn't try to justify the continued existence of len() and friends with technical arguments. I'll grant you that avoiding a method lookup is cheaper, another question is whether the difference would be noticeable in practice. I'd say that if methods were such a bad thing, that would put in question the implementation of the whole OO paradigm in Python, no? On a side note, there is an alternative to dir(), more human-friendly: http://inky.github.com/see/ py see(a) ? [] in + * % = == != = len() .capitalize() .center() .count() .decode() .encode() .endswith() .expandtabs() .find() .format() .index() .isalnum() .isalpha() .isdigit() .islower() .isspace() .istitle() .isupper() .join() .ljust() .lower() .lstrip() .partition() .replace() .rfind() .rindex() .rjust() .rpartition() .rsplit() .rstrip() .split() .splitlines() .startswith() .strip() .swapcase() .title() .translate() .upper() .zfill() You can see len() there. Nice! That's indeed more readable than dir(). Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
On Sunday 19 April 2009 21:46:46 Christian Heimes wrote: Emmanuel Surleau wrote: First off, it's pretty commonplace in OO languages. Secondly, given the number of methods available for the string objects, it is only natural to assume that dir(a) would show me a len() or length() or size() method. Having to use a function for such a mundane operation feels unnatural and not OO. If you replace the term OO with Java in your posting, then I'm going to agree with you. Neither Java nor Python are pure object oriented languages. A while ago a friend of mine called Java a class centric programming language. I think that describes Java's coding philosophy very good. Python has a different coding philosphy. You can't assume that Java style development works with Python (and vice versa). I don't know if it's Java-style development - you use a method to retrieve the length of a string in C++, Ruby or Javascript. Are you trying to say that having len() as a method/property is not object-oriented? The FAQ link in Gabriel Genellina's posting justifies the existence len as a function as historical. It does not seem to serve much purpose now. If there is a deeper reason why len as a function makes more sense than len as a method, I'd be (genuinely) curious to hear it. Now to your rant about len(). Python class may implement several protocols with magic methods like __len__(), __iter__() or __getitem__(). The magic methods start and begin with two _. When a method implements the __len__() method then it supports len(). In Python readability counts. Try import this in a Python shell. Not trying to attack you, but I'm not sure of what you're trying to say here. That len(a) is more readable than a.len()? PEP 8 is a coding guideline for the standard library. It's not a law. Some modules are older than the PEP, other modules and libraries were developed outside the core and added later. We had a long discussion about PEP8'ing more code but eventually we decided against it. More chances would break too much 3rd party code. I was not suggesting breaking. What's wrong with aliasing and marking as deprecated? Also, given that Python 3000 breaks backward compatibility anyway, I don't see the point in not cleaning up the standard library completely and get rid of CamelCase once and for all. Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
What makes you think Python is an OO language? Python is a dynamic object-oriented programming language that can be used for many kinds of software development. First line on the Python official website. Was this a trick question? What kind of OO language allows you to do this: def square(x): return x*x for i in range(10): print square(x) Ruby, for instance. Allowing for procedural-style programming does not mean that a language does not implement (even imperfectly) an OO paradigm. Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I get path/name of the softlink to my python script when executing it
Hello I fear that in this case the whole indirection operations on softlink occur only in the shell, and that the final command is only executed as if it were called directly on the real file... Have you tried typing python ./waf, to see how the resolution occurs in that case ? Regards, Pascal Saravanan Shanmugham (sarvi) a écrit : Hi, I am writiing a script say wabexec in python I will then have softlinks from other softlinks like ls, waf,hello, etc that are in the same directory and pointing to wabexec. When some executes ./waf or ./hello and wabexec gets invoked because of the softlink, how do I find out from within wabexec how it was invoked? was it throug waf or hello, etc. both __file__ and sys.arg0[] seem to have wabexec not the name of the softlink. Any ideas? Sarvi -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: can python access OS level features like bash scripting?
On Sun, 2009-04-19 at 14:55 -0300, Gabriel Genellina wrote: Write a setup.py script using the distutils package: http://docs.python.org/distutils/index.html So that can distutil do the work of setting up the database and can it find for itself if psycopg2 and other related libraries are installed? I am going to create a deb file, so is it a good idea to some how have the deb rules execute the setup.py file of the distutils? Besides, I will also like to create a single file containing all the modules i need as dependencies so even if a user does not have internet, we can still install the package on that machine. So will it be a good idea to let distutils do every thing I had described about putting files in the place and having the script copyed to /usr/bin etc? happy hacking. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
On Apr 17, 10:07 pm, Aaron Brady castiro...@gmail.com wrote: You can do it with a wrapping generator. I'm not sure if it interferes with your needs. It calls 'next' the first time, then just calls 'send' on the parameter with the value you send it. Aaron, Thanks for the hint. I'd made a modified version of my generator that was for loop aware and had two yields in it, but this seemed very fragile and hackish to me, and left my generator only usable inside a for loop. The wrapper method seems to be a much better way to go. dale -- http://mail.python.org/mailman/listinfo/python-list
ANN: Mock 0.5.0 Release
Mock 0.5.0 has just been released.
* Mock Homepage http://www.voidspace.org.uk/python/mock/
* Download Mock 0.5.0 release (zip)
http://www.voidspace.org.uk/downloads/mock-0.5.0.zip
* Mock Documentation as a PDF http://www.voidspace.org.uk/downloads/mock.pdf
* Mock entry on PyPI http://pypi.python.org/pypi/mock/
* Repository and Issue Tracker on Google Code http://code.google.com/p/mock/
This *isn't* backwards compatible as it cleans up the API in a few
ways, but they're all good changes I promise. {sm;:wink:}
One of the new features is that the Mock class now supports wrapping
objects; using the ``wraps`` keyword.
One of the other big changes is that the documentation is now built
with the ever-wonderful Sphinx, so the homepage is new and there also
a PDF of the documentation.
Mock is a library for the creation of simple mock objects that track
how they are used so that you can make assertions. It uses the action -
assertion pattern rather than the record - replay pattern. Action -
assertion puts your tests after you have used the objects, which
seems more natural and means that you can make assertions about only
the behavior you are interested in. Mock also contains two decorators
(``patch`` and ``patch_object``) which make it easy to safely mock out
dependencies in the module under test purely within the scope of the
test itself (unpatching is done automatically on exit whether or not
the test passes). One of the changes in this release is that these
decorators also become context managers allowing them to be used with
the 'with statement'.
Mock can be installed with:
``easy_install mock``
The changelog for all changes in this release is:
* Made DEFAULT part of the public api.
* Documentation built with Sphinx.
* ``side_effect`` is now called with the same arguments as the mock is
called with and
if returns a non-DEFAULT value that is automatically set as the
``mock.return_value``.
* ``wraps`` keyword argument used for wrapping objects (and passing
calls through to the wrapped object).
* ``Mock.reset`` renamed to ``Mock.reset_mock``, as reset is a common
API name.
* ``patch`` / ``patch_object`` are now context managers and can be
used with ``with``.
* A new 'create' keyword argument to patch and patch_object that
allows them to patch
(and unpatch) attributes that don't exist. (Potentially unsafe to
use - it can allow
you to have tests that pass when they are testing an API that
doesn't exist - use at
your own risk!)
* The methods keyword argument to Mock has been removed and merged
with spec. The spec
argument can now be a list of methods or an object to take the spec
from.
* Nested patches may now be applied in a different order (created
mocks passed
in the opposite order). This is actually a bugfix.
* patch and patch_object now take a spec keyword argument. If spec is
passed in as 'True' then the Mock created will take the object it is
replacing
as its spec object. If the object being replaced is a class, then
the return
value for the mock will also use the class as a spec.
* A Mock created without a spec will not attempt to mock any magic
methods / attributes
(they will raise an ``AttributeError`` instead).
Many thanks to all those who gave feedback, feature requests and
patches!
What *isn't* in 0.5.0 is support for mocking magic methods. I do have
a technique in mind for this, which I implemented for the container
methods. It is very clean, but different from the pattern used to mock
out other methods. As I'm not currently using it I'm going to wait
until I need it and see if it works well in practise.
If you're interested in trying it, the code (with full documentation)
in a 'magics branch':
* http://code.google.com/p/mock/source/browse/#svn/branches/magics
--
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RE: How can I get path/name of the softlink to my python script when executing it
Sorry. I should have responded earlier to close this thread. It was my programming error. Both sys.argv[0] and __file__ do point to the name and path of the softlink and not the actual program it is linked to. So. Soryy. My bad programming got in my way. Sarvi From: Pascal Chambon [mailto:chambon.pas...@wanadoo.fr] Sent: Sunday, April 19, 2009 2:36 PM To: Saravanan Shanmugham (sarvi) Cc: python-list@python.org Subject: Re: How can I get path/name of the softlink to my python script when executing it Importance: High Hello I fear that in this case the whole indirection operations on softlink occur only in the shell, and that the final command is only executed as if it were called directly on the real file... Have you tried typing python ./waf, to see how the resolution occurs in that case ? Regards, Pascal Saravanan Shanmugham (sarvi) a écrit : Hi, I am writiing a script say wabexec in python I will then have softlinks from other softlinks like ls, waf,hello, etc that are in the same directory and pointing to wabexec. When some executes ./waf or ./hello and wabexec gets invoked because of the softlink, how do I find out from within wabexec how it was invoked? was it throug waf or hello, etc. both __file__ and sys.arg0[] seem to have wabexec not the name of the softlink. Any ideas? Sarvi -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: send() to a generator in a for loop with continue(val)??
On Apr 19, 6:10 am, Peter Otten __pete...@web.de wrote: ... I only just started reading Beazley's presentation, it looks interesting. Thanks for the hint! Are you currently using coroutines in Python? If so, what kind of practical problems do they simplify for you? I thought I'd chime in with an application too. I am using this mechanism to implement a state machine. I read through Beazley's presentation too - wow, lots of ideas in there. For my simple state machine, I am using a very simple trampoline function (see his slides starting at about #172). My run routine is a bit different, but the idea is similar. I'm using this to present images to a test subject (a person looking at a computer screen), and the person's responses guide the state machine. So I need to get data in (the subject responses) and out (the next image to be presented). So I have violated The Beazley Principle of slide #195: Keeping it Straight • If you are going to use coroutines, it is critically important to not mix programming paradigms together • There are three main uses of yield • Iteration (a producer of data) • Receiving messages (a consumer) • A trap (cooperative multitasking) • Do NOT write generator functions that try to do more than one of these at once ...whoops! But I think this is a valid use of the mechanism, in that it is very localized and self contained to just the few routines that make up the state machine. It works very well, makes it easy to implement the state machine clearly, and is easy to understand and maintain. I can see where it could get very confusing to use this mechanism in a more general way. dale -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
Emmanuel Surleau wrote: What makes you think Python is an OO language? Python is a dynamic object-oriented programming language that can be used for many kinds of software development. First line on the Python official website. Was this a trick question? What kind of OO language allows you to do this: def square(x): return x*x for i in range(10): print square(x) Ruby, for instance. Allowing for procedural-style programming does not mean that a language does not implement (even imperfectly) an OO paradigm. Besides, calling Python Object-Orientated is a bit of an insult :-). I would say that Python is Ego-Orientated, it allows me to do what I want. -- MPH http://blog.dcuktec.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a programming language that is combination of Python and Basic?
2009/4/19 Steven D'Aprano st...@remove-this-cybersource.com.au: GOTO, after all, is just a jump, and we use jumps in Python all the time: raise Exception break continue if... elif... else... for... else... etc. So as a syllogism: P1: GOTO is a jump; P2: GOTO is bad. C: Jumps are bad. And then by showing the conclusion is false, you believe you have shown a contradiction? Try looking up Affirming the consequent! GOTO is an /unstructured/ jump. Raise, break, continue, if, for and so an are all /structured/ jumps. -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Keyerror addhandler
Hi all,
I'm wondering if anyone can assist me with this as I am very confused about
it now.
I am getting the following error;
Traceback (most recent call last):
File /usr/lib/python2.4/logging/config.py, line 191, in fileConfig
logger.addHandler(handlers[hand])
KeyError: 'handler_mylogfileHandler'
My code:
import logging
import logging.config
import logging.handlers
#parse config file
logging.config.fileConfig(logging.conf)
#create logger
logger = logging.getLogger(pythonacro)
my config:
[loggers]
keys=root,pythonacro
[handlers]
keys=consoleHandler,mylogfileHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_pythonacro]
level=DEBUG
handlers=consoleHandler,mylogfileHandler
propagate=1
qualname=pythonacro
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[handler_mylogfileHandler]
class=RotatingFileHandler
level=DEBUG
formatter=simpleFormatter
args=('python_acro.log', 'a', 125829120, 5)
filename=python_acro.log
mode=a
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=
As far as I can tell, this is correct according to logging-config-fileformat
and documentation found on google.
Any ideas?
Many thanks
Steven
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Re: Keyerror addhandler
Steven Macintyre schrieb: Hi all, I'm wondering if anyone can assist me with this as I am very confused about it now. I am getting the following error; Traceback (most recent call last): File /usr/lib/python2.4/logging/config.py, line 191, in fileConfig logger.addHandler(handlers[hand]) KeyError: 'handler_mylogfileHandler' For me, that fails with mac-dir:tmp deets$ python2.5 test.py Traceback (most recent call last): File test.py, line 6, in module logging.config.fileConfig(logging.conf) File /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/logging/config.py, line 84, in fileConfig handlers = _install_handlers(cp, formatters) File /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/logging/config.py, line 149, in _install_handlers klass = eval(klass, vars(logging)) File string, line 1, in module NameError: name 'RotatingFileHandler' is not defined mac-dir:tmp deets$ Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Useful MySQL Routines
In message mailman.4160.1240152762.11746.python-l...@python.org, Tino Wildenhain wrote: Lawrence D'Oliveiro wrote: In message mailman.4148.1240135989.11746.python-l...@python.org, Tino Wildenhain wrote: Btw, the bulkinserter could be better done by using executemany and select usefull batch sizes. Hmm, I've never bothered with executemany. The code as written copes comfortably with 10,000 records or so. Would be interesting to see the difference. Go on, give it a try and let us know how it goes. -- http://mail.python.org/mailman/listinfo/python-list
Re: QT , Wxwidgets are not just UI framework ?
thank you so much -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python standard library and PEP8
On Sun, 19 Apr 2009 18:43:10 +0200, Emmanuel Surleau wrote: On an unrelated note, it would be *really* nice to have a length property on strings. Even Java has that! And even in Java, they have sin(x) rather than x.sin(). Dan -- Dan Sommers A death spiral goes clock- http://www.tombstonezero.net/dan/ wise north of the equator. Atoms are not things. -- Werner Heisenberg -- Dilbert's PHB -- http://mail.python.org/mailman/listinfo/python-list
