Mailman 3 August 2004 - Python-Dev

PEP 324 (process module)
by Guido van Rossum 05 Aug '04

05 Aug '04

I believe ActiveState's Trent Mick has released something along these lines. Does your proposed API match theirs? --Guido van Rossum (home page: http://www.python.org/~guido/)

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RE: Exceptional inheritance patterns (was Re: [Python-Dev] Python inUnicode context)
by Robert Brewer 05 Aug '04

05 Aug '04

Holger Krekel wrote: > Sure, i can probably wrap the result object into some class > which inherits from Exception. My point is that I like to > regard try/except as a mechanism for "out-of-band" objects. > Guidos "should be shot" seems to indicate he sees try/except > only useful/applicable to exception-handling. Putting on my "language lawyer" hat: "Exceptions are a means of breaking out of the normal flow of control of a code block in order to handle errors or other exceptional conditions. An exception is raised at the point where the error is detected; it may be handled by the surrounding code block or by any code block that directly or indirectly invoked the code block where the error occurred." If "exception" is only meant for errors, then don't use it for non-errors. But if "exception" is meant for "other exceptional conditions", then why not use it for them? Sounds to me like you just need to expand your use of the term "exception", and therefore, your use of Exception(). ;) Robert Brewer MIS Amor Ministries fumanchu(a)amor.org

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RE: select() vs. pipes (was [Python-Dev] Re: PEP 324 (process module))
by Moore, Paul 05 Aug '04

05 Aug '04

From: Chris McDonough > I've actually looked at it and it's quite nice, but it doesn't > do one thing that I'd like to see as part of a process stdlib > library. The use case I'm thinking of is one where a long-running > program needs to monitor the output of many other potentially > long-running processes I have a couple of other use cases, as well. 1. Manage an interactive subprocess, sending it input and reading output in "chunks". This is an expect-like activity in some ways: I use it to wrap an alternative UI round an interactive command line process. I suspect Trent's ProcessProxy would help with this - must check. 2. Run a command with no input, and get its output back, like the shell backtick operator. Errors in the command should appear as exceptions. 3. Filter a string through an external command - the interact() method handles this, but again I'd like errors to appear as exceptions. To some extent, (2) and (3) are simple "helper" functions round the existing methods, but I believe such helpers would be useful. And the "convert subcommand error to exception" code is non-trivial, and hence useful to encapsulate in the library. This is getting pretty off-topic for python-dev. Is there any value in setting up a list/SIG for discussing the design of a stdlib process module? Paul. __________________________________________________________________________ This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Atos Origin group liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted. __________________________________________________________________________

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No handlers could be found for logger "cookielib"
by Tim Peters 05 Aug '04

05 Aug '04

I first saw this last night, when running the -all tests on WinXP, CVS HEAD: ... test_univnewlines test_unpack test_urllib test_urllib2 No handlers could be found for logger "cookielib" HERE test_urllibnet ... It didn't act the same way in isolation. Anyone have a clue? The test still passes, it just spits out that unhelpful logger output -- sometimes.

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Submitted socket.socketpair() patch to SF
by Dave Cole 05 Aug '04

05 Aug '04

For the interested, I have just submitted patch #1003700 which implements the socketpair function in the socket module. The patch is relative to 2.4a1. There is a question in the patch summary: Outstanding question is whether the family, type, proto arguments should be kwargs as per socket() function, or positional as per fromfd() function. If kwargs, then it is arguable that the fromfd() arguments should be changed (in another patch). I noticed a couple of things in the documentation while implementing the patch: 1) The documentation for socket() does not make mention of the fact that all arguments are kwargs. 2) The documentation for fromfd() does not mention that it does a dup() on the supplied fd to create a socket object. - Dave -- http://www.object-craft.com.au

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RE: [Python-Dev] Re: 2.4a2, and @decorators
by Batista, Facundo 04 Aug '04

04 Aug '04

Didn't followed closely this discussion, but my general feeling is that the development community position is not clear regarding this feature. Python is what it is now because of well thinked changes. I don't want, because of the hurry of 2.4, to include this particular feature without a hard approval of the community. Will be easiest to include it in 2.5 than to extract it. So, all that said, I'm +1 to take this out from 2.4. . Facundo #- -----Mensaje original----- #- De: Jim Fulton [mailto:jim@zope.com] #- Enviado el: Miercoles, 04 de Agosto de 2004 11:32 #- Para: Andrew McNamara #- CC: python-dev(a)python.org #- Asunto: Re: [Python-Dev] Re: 2.4a2, and @decorators #- #- #- Andrew McNamara wrote: #- >>>An advantage of the #- >>>@ syntax is than it makes the complexiity separable and #- ignorable for #- >>>someone learning/teaching basic Python, #- >> #- >>I don't agree that they are ignorable. People will see #- them in code #- >>and will *have* to understand what they mean. Given sme examples #- >>I've seen here, this will sometimes be a significant chalenge. #- > #- > #- > There are a number of "advanced" features in python that could be a #- > barrier to understanding for new users, but which are #- rarely seen in #- > practice - metaclasses being the classic example. #- > #- > I imagine these features are rarely seen because most people don't #- > understand them, and those that do have the good taste not #- to use them #- > gratuitously. #- #- This feature won't be rarely used. Class and static methods #- and properties are created fairly often, certainly far more often #- than meta classes. #- #- Jim #- #- -- #- Jim Fulton mailto:jim@zope.com Python Powered! #- CTO (540) 361-1714 http://www.python.org #- Zope Corporation http://www.zope.com http://www.zope.org #- _______________________________________________ #- Python-Dev mailing list #- Python-Dev(a)python.org #- http://mail.python.org/mailman/listinfo/python-dev #- Unsubscribe: #- http://mail.python.org/mailman/options/python-dev/fbatista%40 unifon.com.ar

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Fix import errors to have data
by Jim Fulton 04 Aug '04

04 Aug '04

A common idiom to optionally support some module if it is present is to use ImportError handlers: try: import foo except ImportError: # Configure for absense of foo ... else: # Configure for presense of foo ... Unfortunately, this is a bug trap. The module foo might be present and yet it's import could fail with an import error. This can happen if one of *its* imports fails. Code like that above will hide such bugs. Unfortunately, it's hard to do this correctly, because ImportErrors don't have the module name as data. When the import error is raised, it is raised with an error message rather than data. This is because most standard exception classes share a common __str__ that simply prints their initialization arguments. At present, to conditionally support a module, you have to use code like: try: import foo except ImportError, v: if not str(v).endsswith(' foo'): raise # Configure for absense of foo ... else: # Configure for presense of foo ... which is ugly and brittle. I'd like to get this fixed. I propose to: - Provide ImportError with an __init__ that takes a module name and sets a module_name attribute - Provide ImportError with an __str__ that produces the message we have now - Change standard code that raises import errors to provide just the module name. With this change, one could write careful conditional import code like this: try: import foo except ImportError, v: if v.module_name != 'foo': raise # Configure for absense of foo ... else: # Configure for presense of foo ... which is much cleaner IMO. Jim -- Jim Fulton mailto:jim@zope.com Python Powered! CTO (540) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org

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[Python-Dev] Re: [Python-checkins] python/dist/src/Python compile.c, 2.311, 2.312
by Guido van Rossum 04 Aug '04

04 Aug '04

> Log Message: > Don't intern the filename of a file being compiled. > Hard to believe it ever helped anything, and it hurts finding reference > leaks. The intention was to introduce sharing of the filename object between code objects compiled from the same file (remember that every method is a separate code object). But I believe the sharing won't happen when the code is loaded from a bytecoded file instead, so it is indeed wasted efficiency. Good catch. --Guido van Rossum (home page: http://www.python.org/~guido/)

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Cygwin and sockets
by "Martin v. Löwis" 04 Aug '04

04 Aug '04

We have a report (#1001857) that the socket module does not build on Cygwin. Can anybody confirm that? Regards, Martin

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Weekly Python Bug/Patch Summary
by Kurt B. Kaiser 04 Aug '04

04 Aug '04

Patch / Bug Summary ___________________ Patches : 276 open ( -3) / 2493 closed (+10) / 2769 total ( +7) Bugs : 766 open ( +4) / 4317 closed (+14) / 5083 total (+18) RFE : 146 open ( +1) / 130 closed ( +0) / 276 total ( +1) New / Reopened Patches ______________________ A BSD-style wait4 implementation (2004-07-29) http://python.org/sf/1000267 opened by chads posixpath._resolve_link typo (2004-07-31) CLOSED http://python.org/sf/1001109 opened by Ronald Oussoren socketmodule on OpenBSD/sparc64 (64bit machine) (2004-08-01) http://python.org/sf/1001610 opened by Aleksander Piotrowski Logger file objects (2004-08-02) http://python.org/sf/1001864 opened by Miki Tebeka O(1) xrange membership testing (2004-08-02) http://python.org/sf/1002085 opened by Mac-arena the Bored Zo Better extensibility for distutils commands (2004-08-02) CLOSED http://python.org/sf/1002241 opened by Fred L. Drake, Jr. Patches Closed ______________ posixpath._resolve_link typo (2004-07-31) http://python.org/sf/1001109 closed by ronaldoussoren Implementation for PEP 318 using java-style syntax (2004-06-25) http://python.org/sf/979728 closed by anthonybaxter Better extensibility for distutils commands (2004-08-02) http://python.org/sf/1002241 closed by fdrake HTTP basic authentication problem (2004-07-20) http://python.org/sf/994595 closed by loewis speed up md5: allow Encode and Decode to inline (2004-06-22) http://python.org/sf/977074 closed by loewis add option to NOT use ~/.netrc in nntplib.NNTP() (2003-10-14) http://python.org/sf/823072 closed by loewis askstring => grab fail (2004-05-02) http://python.org/sf/946153 closed by loewis 658254: accept None for time.ctime() and friends (2003-01-06) http://python.org/sf/663482 closed by fdrake Add support for sync and use "wish" options (2004-07-08) http://python.org/sf/986929 closed by loewis commands.py for Windows (2002-12-17) http://python.org/sf/655421 closed by zopezen New / Reopened Bugs ___________________ optparse error method doesn't print option info (2004-07-29) http://python.org/sf/1000439 opened by Ivan Nestlerode "make pdf" failure w/ 2.4 docs (2004-07-30) http://python.org/sf/1000841 opened by Mat Martineau Carbon.CF.CFMutableArray hangs interpreter (2004-07-30) http://python.org/sf/1000914 opened by Ronald Oussoren str.join([ str-subtype-instance ]) misbehaves (2004-07-31) http://python.org/sf/1001011 opened by Thomas Wouters setdefaulttimeout causes unnecessary timeouts on connect err (2004-07-31) CLOSED http://python.org/sf/1001018 opened by Mark Hammond wave.open() with unicode filename fails (2004-07-31) CLOSED http://python.org/sf/1001053 opened by John Popplewell incorrect reference to macro named foo (2004-07-31) CLOSED http://python.org/sf/1001088 opened by Clinton Roy hotspot profiler does not work correctly on P4 CPUs with HT (2004-07-31) http://python.org/sf/1001150 opened by Viktor Ferenczi glob unicode (2004-08-01) http://python.org/sf/1001604 opened by leve socketmodule does not build under cygwin (2004-08-02) http://python.org/sf/1001857 opened by Miki Tebeka IDLE hangs when inactive more than 2 hours (2004-08-02) http://python.org/sf/1001869 opened by Miki Tebeka os.path.realpath can't handle symlink loops (2004-04-05) http://python.org/sf/930024 reopened by loewis os.path.sameopenfile documentation wrong. (2004-08-02) http://python.org/sf/1002398 opened by Jeremy Fincher Wrong documentation of __radd__ etc. (2004-08-03) http://python.org/sf/1002453 opened by Hallvard B Furuseth MemoryError on AIX52 (2004-08-03) http://python.org/sf/1002465 opened by Datranet email message parser doesn't handle \r\n correctly (2004-08-03) http://python.org/sf/1002475 opened by Sjoerd Mullender test_decimal fails if repeated (2004-08-03) http://python.org/sf/1002530 opened by Michael Hudson test_logging fails if run twice (2004-08-03) http://python.org/sf/1002537 opened by Michael Hudson glob() unicode bug (2004-08-03) CLOSED http://python.org/sf/1002632 opened by leve asynchat does not accept 'long' terminator (2004-08-03) http://python.org/sf/1002763 opened by Jey Kottalam Bugs Closed ___________ "disjunct" should be "disjoint" (2004-07-25) http://python.org/sf/997533 closed by rhettinger Mingw needs to use the same MSVC runtime as Python (2004-01-04) http://python.org/sf/870382 closed by loewis Python 2.3.4, Solaris 7, socketmodule.c does not compile (2004-06-14) http://python.org/sf/972724 closed by brucedray setdefaulttimeout causes unnecessary timeouts on connect err (2004-07-30) http://python.org/sf/1001018 closed by tim_one wave.open() with unicode filename fails (2004-07-30) http://python.org/sf/1001053 closed by nnorwitz incorrect reference to macro named foo (2004-07-31) http://python.org/sf/1001088 closed by nnorwitz os.path.realpath can't handle symlink loops (2004-04-05) http://python.org/sf/930024 closed by akuchling leaking snippet (2003-09-18) http://python.org/sf/808596 closed by mwh refleaks in _hotshot.c (2003-09-18) http://python.org/sf/808756 closed by arigo math and cmath docs don't specify radians (2004-07-23) http://python.org/sf/996392 closed by tim_one bsddb has default flag of c, not r (2004-07-26) http://python.org/sf/998001 closed by akuchling glob() unicode bug (2004-08-03) http://python.org/sf/1002632 closed by lemburg boolobject.h documentation missing from Python/C API (2004-01-22) http://python.org/sf/882332 closed by fdrake Accept None for time.ctime() and friends (2002-12-24) http://python.org/sf/658254 closed by fdrake idle.py doesn't accept ( in some cases (2003-07-22) http://python.org/sf/775541 closed by kbk New / Reopened RFE __________________ Adding missing ISO 8859 codecs, especially Thai (2004-08-02) http://python.org/sf/1001895 opened by Peter Jacobi

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Python-Dev August 2004