🌐 Mailman 3 January 2009 - Python-list - python.org

Re: mod_pylite?
by excord80 Jan. 2, 2009

Jan. 2, 2009

On Jan 1, 9:12 pm, s...(a)pobox.com wrote: > >>http://broadcast.oreilly.com/2008/12/five-features-perl-5-needs-now.html > > >> and he mentions a neat-looking project called ``mod_perlite``. It > >> sounds like it will be very handy. Anyone working on a > >> ``mod_pylite``? Has it been done before, maybe under a different > >> name? > > It's kind of hard to tell. There's very little description of how > mod_perlite would be different than mod_perl other than it would be more > lightweight, presumably as mod_php somehow is. That hardly seems like a > well-defined requirement document. > > Does mod_wsgi fit the bill?http://www.rkblog.rk.edu.pl/w/p/mod_wsgi/ > I'm not sure if it fits the bill or not. The bill is two-fold: 1. The Apache module should present little risk to the admin who installs it. That is, it should not expose Apache's innards. 2. The Apache module should keep a Python instance running; run, for example, ``foo.py`` when a user accesses (for example) ``http:// www.example.com/path/to/foo.py?baz=88``; pass baz=88 to foo.py in the usual way; and return whatever html that script spits out. I'm not familiar with php or ``mod_php``, but I suspect that setup does something very similar to what's described above. This might explain why it's so blasted easy to deploy php scripts and create small and simple sites (and even not-so-small/simple sites) with it. Does mod_wsgi fit that bill? I don't know. The docs seem to be at http://code.google.com/p/modwsgi/w/list . Many of those are named "ChangesInVersionXXXX". I don't see any that named anything like "Introduction" or "BasicUsage" or "SimpleUsageLikeCGI" or even "Tutorial". So, my guess is that ``mod_wsgi`` doesn't fit the bill.

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2to3 used in the Shootout
by bearophileHUGS＠lycos.com Jan. 2, 2009

Jan. 2, 2009

They have translated the Python benchmarks of the Shootout site from Py2 to Py3 using 2to3: http://shootout.alioth.debian.org/u32/benchmark.php?test=all&lang=python3 It shows some "performance bugs" of Python3 itself (especially regarding the binary-trees benchmark, that was unexpected by me), and two points where 2to3 may be improved, for example after the translation this gives error: table=string.maketrans('ACBDGHK\nMNSRUTWVYacbdghkmnsrutwvy', 'TGVHCDM \nKNSYAAWBRTGVHCDMKNSYAAWBR')): Gives: TypeError: maketrans arguments must be bytes objects Bye, bearophile

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Creating an application for Linux
by Mike Driscoll Jan. 2, 2009

Jan. 2, 2009

Hi, My boss wants me to port one of my applications to Ubuntu. I successfully ported it without too many headaches but now I need a way to distribute it to people that may or may not already have the dependencies my application requires. I'm a newb with Linux so I'm not even sure what they call the distribution (rpms, deb, source code). After browsing the various "installer" docs out there, it looks like bbfreeze or PyInstaller might work, but I couldn't find any examples. Any advice is appreciated. Thanks! I am using Python 2.5.2 and this is a wxPython application with SqlAlchemy and a few other external packages. Mike

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Unreasonable memory usage under linux with a simple loop
by ming_cuhk Jan. 2, 2009

Jan. 2, 2009

Hi all, I'm new to here and python. When I tried the code below to test python's speed... I found that python use more than 1.5G memory to run this and cost several minutes.... And this happened only under my linux os. Both jython and python... Is there something wrong with python under linux or my code? Thanks! a = 0 for i in range(100000000): a = a + 1 print a

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Re: AttributeError: 'module' object has no attribute 'DatagramHandler' (ubuntu-8.10, python 2.5.2)
by Vinay Sajip Jan. 2, 2009

Jan. 2, 2009

On Dec 29 2008, 12:18 pm, "Chris Rebert" <c...(a)rebertia.com> wrote: > > "The StreamHandler and FileHandler classes are defined in the coreloggingpackage. The other handlers are defined in a sub- module,logging.handlers." > > There's your answer. I do agree though that the "classlogging.DatagramHandler" line in the docs is misleading to say the > least. Perhaps a docs bug should be filed... > This should now be fixed in the current docs - thanks to Georg Brandl (creator of the Python documentation system). Regards, Vinay Sajip

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Re: If your were going to program a game...
by Aaron Brady Jan. 2, 2009

Jan. 2, 2009

On Jan 1, 2:55 pm, "Chris Rebert" <c...(a)rebertia.com> wrote: > On Thu, Jan 1, 2009 at 12:24 PM, excord80 <excor...(a)gmail.com> wrote: > > On Jan 1, 2:37 pm, Kay Schluehr <kay.schlu...(a)gmx.net> wrote: > > >> There is no solution to this problem from a Python perspective. Do > >> what everyone does right now: [snip] > > > It still surprises me that no one has implemented the solution for > > this yet. > > > Maybe it's harder than it seems, but it *seeems* like it's just a > > matter of telling Firefox, "hey, when you see this special html > > element that tells you to run this python code from the web, do it". > > Then have FF load up a python interpreter, sandbox it somehow (that > > is, limit it to only a safe subset of its std lib), it runs the code > > The "sandbox it somehow" part is significantly harder than you seem to > believe it would be. Python tried previously with the rexec and > Bastion modules, but they were found to be irreparably flawed and thus > were removed. Suppose you compiled a version with no file type and a reduced os module?

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Re: Triple quoted string in exec function ?
by Steven D'Aprano Jan. 2, 2009

Jan. 2, 2009

On Fri, 02 Jan 2009 14:39:25 +0100, Stef Mientki wrote: > thanks for all the answers, > but I still don't understand it yet :-( So maybe someone could explain > why the next few lines of code don't work: > > Code = '' > Code += """multiline comment > and more lines""" > exec ( Code ) You don't actually tell us what you expect to happen, so I'm going to take a wild guess. You are expecting that the contents of Code above should be a triple-quoted string, which Python treats as a comment when it is on its own (unless it is a doc string). A clue as to what is going on: >>> s = "x = 1" >>> print s x = 1 >>> exec s >>> x 1 Notice that even though the string s is created with delimiters ", the quote marks are not part of the string. Whether you use delimiters " ' ''' or """ doesn't matter, the delimiters are not part of the string. If you want quote marks *inside* the string, you need to include them as characters, not as delimiters: >>> s = "y = " # using " as delimiters >>> s += 'abc' # using ' as delimiters >>> print s # no quotes inside s y = abc >>> exec s Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<string>", line 1, in <module> NameError: name 'abc' is not defined >>> s = "y = " >>> s += '"abc"' # quotes inside the string >>> print s # includes quotes inside s y = "abc" >>> exec s >>> y 'abc' The fact that your earlier example used """ as delimiters instead of " is irrelevant. The delimiters are not part of the string, and so aren't seen by exec. There's no problem with exec and triple-quoted strings. You're just not giving it a triple-quoted string to work with. Another thing, you wrote: Code = '' Code += """multiline comment and more lines""" That's a little like saying: x = 0 x += 1 instead of just x = 1. Except that in general, string concatenation is potentially MUCH MUCH MUCH slower than addition. (If you haven't noticed the slow down, you're lucky you haven't hit the right circumstances.) s = """multiline comment and more lines""" makes a string s that starts with the letter m: >>> print s multiline comment and more lines That's no different from any other string delimiters. The delimiters are never part of the string. You want the string to start with three quotation marks, not m, so you have to include the quote marks inside the string. To do that, you need to use two different quote delimiters: >>> s = """'''multiline comment ... and more lines'''""" >>> print s '''multiline comment and more lines''' >>> exec s >>> Works perfectly. -- Steven

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Re: Triple quoted string in exec function ?
by John Machin Jan. 2, 2009

Jan. 2, 2009

On Jan 3, 12:39 am, Stef Mientki <stef.mien...(a)gmail.com> wrote: > Stef Mientki wrote: > > hello, > > > I'm running scripts, with the execute function (Python 2.5), > > and it seems that triple quoted strings are not allowed. > > > Is there a workaround, > > or is this a fundamental problem of the exec-function ? > > > thanks, > > Stef Mientki > > thanks for all the answers, > but I still don't understand it yet :-( > So maybe someone could explain why the next few lines of code don't work: Stef, "it doesn't work" is user-speak. Say what what you expected, and what happened instead. > Code = '' > Code += """multiline comment > and more lines""" > exec ( Code ) That is equivalent to: code = "multiline comment\nand morelines" exec(code) which of course produces a Syntax Error. What did you expect? Oh, yeah, the so-called "multiline comment". I can't imagine why you want to put comments in code that you're going to exec, but you need an extra layer of quotes: Code += '''"""multiline comment and more lines"""'''

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FW: python import sys.path
by Kelly, Brian Jan. 2, 2009

Jan. 2, 2009

After following your suggestions I was able to confirm that the 2.5 interpreter was being invoked. So then I grepped for all instances of python in the scripts that were imported as modules: from bacula_conf import * The calling script cleanup.py is invoking purge_client.py like an external script: def purgeAll(options, computer_name): cmd = "python purge_client.py %s" % computer_name if options.pretend <> True: error = os.system(cmd) else: _log.info("Done. No changes made due to --pretend flag.") if not error: return True else: return False When I saw the imports I assumed the functions in purge_client.py were being referenced from the calling scripts symbol table. However, that is not the case. Thanks, Brian -----Original Message----- From: John Machin [mailto:sjmachin@lexicon.net] Sent: Tuesday, December 30, 2008 4:42 PM To: python-list(a)python.org Subject: Re: python import sys.path On Dec 31, 5:05 am, "Kelly, Brian" <Brian.Ke...(a)uwsp.edu> wrote: > I have both 2.4 and 2.5 interpreters installed on a linux box. The > PythonPath is set to : > > PYTHONPATH=/usr/lib64/portage/pym:/prod/bacula/local/lib64/python2.4/site-pa > ckages:/prod/bacula/local/lib/python2.4/site-packages > > My main script is getting called like so: > > python2.4 cleanup.py wrkstnbs > > The imports statements in cleanup.py are as follows: > > import os,sys > print sys.path > from datetime import datetime > from optparse import OptionParser # used for parsing parameters > from bacula_conf import * # used for connecting to our > databases, etc. > from registration_cleanup \ > import RegistrationCleanup # used for interacting w/ > registration db (sql1) > # and configuration database > (genunix) > import directory_cleanup as fclean # file cleanup. > > One of the scripts being imported from bacula_conf is called > purge_client.py. > > It has the following imports: > > import sys > import MySQLdb > > Everytime I run "python2.4 cleanup.py wrkstnbs" I get the following error: > > Traceback (most recent call last): Have you snipped any traceback entries here? You say you are running cleanup.py but the first traceback entry is from purge_client.py!! You should first fix that, so that you've got the full story. My guess is that something along that trail is invoking another instance of the Python interpreter and somehow that instance is 2.5, not 2.4. I can't imagine how those 2.5-related entries would otherwise get into sys.path Suggestions: (1) where you are debug-printing sys.path, also print sys.version and sys.argv[0] ... and do debug-printing at more places between start and error. (2) run "python2.4 -vv cleanup.py wrkstnbs" and look for the first mention of 2.5 (indicating something has manipulated sys.path), or sudden cessation of -vv output (indicating a new instance of python is running without -vv), or some other phenomenon ... > File "purge_client.py", line 22, in <module> > import MySQLdb > File > "/prod/bacula/local/lib64/python2.4/site-packages/MySQLdb/__init__.py", line > 27, in <module> > import _mysql > ImportError: /prod/bacula/local/lib64/python2.4/site-packages/_mysql.so: > undefined symbol: Py_InitModule4 What happens when you run python2.4 and at the interactive prompt do >>> import _mysql ? Is there a possibility that you installed 2.5 MySQLdb into the 2.4 hierarchy? [could be a stupid question from a windows guy; this may be a non-problem on linux] Is this the first thing that you've tried after installing 2.5, or the only problem found in an exhaustive regression test of all your apps using 2.4, or somewhere in the middle? [big snip] HTH, John

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Triple quoted string in exec function ?
by Stef Mientki Jan. 2, 2009

Jan. 2, 2009

hello, I'm running scripts, with the execute function (Python 2.5), and it seems that triple quoted strings are not allowed. Is there a workaround, or is this a fundamental problem of the exec-function ? thanks, Stef Mientki

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