Mailman 3 July 2007 - Python-Dev

2.5.2 schedule?
by Jack Howarth July 7, 2007

July 7, 2007

I was wondering if there is a schedule for the release of a python 2.5.2 update? I don't see anything like that on the www.python.org web site. Thanks in advance for any information. Jack

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Fwd: [ python-Patches-1744382 ] Read Write lock
by Yaakov Nemoy July 7, 2007

July 7, 2007

Hi, I submitted this patch a few days ago, and unfortunately have been busy to reply, but now it's Friday :). <snip> Patches item #1744382, was opened at 2007-06-27 20:08 Message generated for change (Comment added) made by loewis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=305470&aid=1744382&group_… <snip> The patch is unacceptable in its current form: - it should be provided as a patch to threading.py, not as a separate module - … [View More]

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Error trying to access community buildbot page
by Grig Gheorghiu July 6, 2007

July 6, 2007

When I go to http://www.python.org/dev/buildbot/community/all/ I get a 503 error "Service Temporarily Unavailable". Can anybody shed some light? Thanks, Grig -- http://agiletesting.blogspot.com

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IDLE Functionality
by Oodi Pilzer July 6, 2007

July 6, 2007

Hi, I am trying to duplicate the indenting functionality of the IDLE into another environment used in an educational setting at MIT. As Python is open software, I assume I can look at the source code for the IDLE. If someone could kindly give me a pointer as to where I might find the source code for this functionality, I would very much appreciate it. Thank you very much, Beth

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PEP 366 - Relative imports from main modules
by Nick Coghlan July 5, 2007

July 5, 2007

A c.l.p discussion referenced from Python-URL just brought this topic back to my attention, and with the relatively low traffic on the development lists in the last few days, it seemed like a good time to repost this PEP (it vanished beneath the Unicode identifier discussion last time). Cheers, Nick. PEP: 366 Title: Main module explicit relative imports Version: $Revision: 56172 $ Last-Modified: $Date: 2007-07-04 22:47:13 +1000 (Wed, 04 Jul 2007) $ Author: Nick Coghlan <ncoghlan(a)… [View More]gmail.com> Status: Draft Type: Standards Track Content-Type: text/x-rst Created: 1-May-2007 Python-Version: 2.6 Post-History: 1-May-2007 Abstract ======== This PEP proposes a backwards compatible mechanism that permits the use of explicit relative imports from executable modules within packages. Such imports currently fail due to an awkward interaction between PEP 328 and PEP 338 - this behaviour is the subject of at least one open SF bug report (#1510172)[1], and has most likely been a factor in at least a few queries on comp.lang.python (such as Alan Isaac's question in [2]). With the proposed mechanism, relative imports will work automatically if the module is executed using the ``-m`` switch. A small amount of boilerplate will be needed in the module itself to allow the relative imports to work when the file is executed by name. Import Statements and the Main Module ===================================== (This section is taken from the final revision of PEP 338) The release of 2.5b1 showed a surprising (although obvious in retrospect) interaction between PEP 338 and PEP 328 - explicit relative imports don't work from a main module. This is due to the fact that relative imports rely on ``__name__`` to determine the current module's position in the package hierarchy. In a main module, the value of ``__name__`` is always ``'__main__'``, so explicit relative imports will always fail (as they only work for a module inside a package). Investigation into why implicit relative imports *appear* to work when a main module is executed directly but fail when executed using ``-m`` showed that such imports are actually always treated as absolute imports. Because of the way direct execution works, the package containing the executed module is added to sys.path, so its sibling modules are actually imported as top level modules. This can easily lead to multiple copies of the sibling modules in the application if implicit relative imports are used in modules that may be directly executed (e.g. test modules or utility scripts). For the 2.5 release, the recommendation is to always use absolute imports in any module that is intended to be used as a main module. The ``-m`` switch already provides a benefit here, as it inserts the current directory into ``sys.path``, instead of the directory containing the main module. This means that it is possible to run a module from inside a package using ``-m`` so long as the current directory contains the top level directory for the package. Absolute imports will work correctly even if the package isn't installed anywhere else on sys.path. If the module is executed directly and uses absolute imports to retrieve its sibling modules, then the top level package directory needs to be installed somewhere on sys.path (since the current directory won't be added automatically). Here's an example file layout:: devel/ pkg/ __init__.py moduleA.py moduleB.py test/ __init__.py test_A.py test_B.py So long as the current directory is ``devel``, or ``devel`` is already on ``sys.path`` and the test modules use absolute imports (such as ``import pkg.moduleA`` to retrieve the module under test, PEP 338 allows the tests to be run as:: python -m pkg.test.test_A python -m pkg.test.test_B Rationale for Change ==================== In rejecting PEP 3122 (which proposed a higher impact solution to this problem), Guido has indicated that he still isn't particularly keen on the idea of executing modules inside packages as scripts [2]. Despite these misgivings he has previously approved the addition of the ``-m`` switch in Python 2.4, and the ``runpy`` module based enhancements described in PEP 338 for Python 2.5. The philosophy that motivated those previous additions (i.e. access to utility or testing scripts without needing to worry about name clashes in either the OS executable namespace or the top level Python namespace) is also the motivation behind fixing what I see as a bug in the current implementation. This PEP is intended to provide a solution which permits explicit relative imports from main modules, without incurring any significant costs during interpreter startup or normal module import. Proposed Solution ================= The heart of the proposed solution is a new module attribute ``__package_name__``. This attribute will be defined only in the main module (i.e. modules where ``__name__ == "__main__"``). For a directly executed main module, this attribute will be set to the empty string. For a module executed using ``runpy.run_module()`` with the ``run_name`` parameter set to ``"__main__"``, the attribute will be set to ``mod_name.rpartition('.')[0]`` (i.e., everything up to but not including the last period). In the import machinery there is an error handling path which deals with the case where an explicit relative reference attempts to go higher than the top level in the package hierarchy. This error path would be changed to fall back on the ``__package_name__`` attribute for explicit relative imports when the importing module is called ``"__main__"``. With this change, explicit relative imports will work automatically from a script executed with the ``-m`` switch. To allow direct execution of the module, the following boilerplate would be needed at the top of the script:: if __name__ == "__main__" and not __package_name__: __package_name__ = "<expected_pkg_name>" Note that this boilerplate is sufficient only if the top level package is already accessible via sys.path. Additional code that manipulates sys.path would be needed in order for direct execution to work without the top level package already being on sys.path. This approach also has the same disadvantage as the use of absolute imports of sibling modules - if the script is moved to a different package or subpackage, the boilerplate will need to be updated manually. With this feature in place, the test scripts in the package above would be able to change their import lines to something along the lines of ``import ..moduleA``. The scripts could then be executed unmodified even if the name of the package was changed. (Rev 47142 in SVN implemented an early variant of this proposal which stored the main module's real module name in the '__module_name__' attribute. It was reverted due to the fact that 2.5 was already in beta by that time.) Alternative Proposals ===================== PEP 3122 proposed addressing this problem by changing the way the main module is identified. That's a huge compatibility cost to incur to fix something that is a pretty minor bug in the overall scheme of things. The advantage of the proposal in this PEP is that its only impact on normal code is the tiny amount of time needed at startup to set the extra attribute in the main module. The changes to the import machinery are all in an existing error handling path, so normal imports don't incur any performance penalty at all. References ========== .. [1] Absolute/relative import not working? (http://www.python.org/sf/1510172) .. [2] Guido's rejection of PEP 3122 (http://mail.python.org/pipermail/python-3000/2007-April/006793.html) .. [3] c.l.p. question about modules and relative imports (http://groups.google.com/group/comp.lang.python/browse_thread/thread/c44c76…) Copyright ========= This document has been placed in the public domain. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia --------------------------------------------------------------- http://www.boredomandlaziness.org [View Less]

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Tracker item: 735515 - urllib to cache 301 redirections?
by O.R.Senthil Kumaran July 5, 2007

July 5, 2007

Hi, One of the tracker items: 735515 mentions that urllib should cache 301 and 302 redirections. urllib / urllib2 should cache the results of 301 (permanent) redirections. This shouldn't break anything, since it's just an internal optimisation from one point of view -- but it's also what the RFC (2616, section 10.3.2, first para) says SHOULD happen. I am trying to understand, what does it mean. Should the original url be avaiable to the user upon request as urllib automatically calls the … [View More]

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Summary of Tracker Issues
by Tracker July 1, 2007

July 1, 2007

ACTIVITY SUMMARY (06/24/07 - 07/01/07) Tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue number. Do NOT respond to this message. 1645 open ( +0) / 8584 closed ( +0) / 10229 total ( +0) Average duration of open issues: 843 days. Median duration of open issues: 791 days. Open Issues Breakdown open 1645 ( +0) pending 0 ( +0)

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