Mailman 3 May 2011 - Python-Dev

What if replacing items in a dictionary returns the new dictionary?
by Roy Hyunjin Han May 5, 2011

May 5, 2011

It would be convenient if replacing items in a dictionary returns the new dictionary, in a manner analogous to str.replace(). What do you think? :: # Current behavior x = {'key1': 1} x.update(key1=3) == None x == {'key1': 3} # Original variable has changed # Possible behavior x = {'key1': 1} x.replace(key1=3) == {'key1': 3} x == {'key1': 1} # Original variable is unchanged

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Re: [Python-Dev] cpython (2.7): Issue #11277: test_zlib tests a buffer of 1 GB on 32 bits
by Antoine Pitrou May 4, 2011

May 4, 2011

On Wed, 04 May 2011 21:27:50 +0200 victor.stinner <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/7f3cab59ef3e > changeset: 69834:7f3cab59ef3e > branch: 2.7 > parent: 69827:affec521b330 > user: Victor Stinner <victor.stinner(a)haypocalc.com> > date: Wed May 04 21:27:39 2011 +0200 > summary: > Issue #11277: test_zlib tests a buffer of 1 GB on 32 bits What's the point? The issue with 2GB or 4GB buffers is that they cross the potential limit of a machine type (a signed or unsigned integer). I don't see any benefit in testing a 1GB buffer; the test could probably be removed instead. Regards Antoine.

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New interest areas in Experts Index
by Nick Coghlan May 4, 2011

May 4, 2011

I just added two new interest areas in the Expert's Index [1] context managers: for any issues relating to proposals to add context management capabilities to objects in the stdlib, triagers should feel free to add me to the nosy list test coverage: this is specifically for anyone willing to help review and commit test coverage improvement patches (rather than the more general "testing" interest area that was already present) Cheers, Nick. [1] http://docs.python.org/devguide/experts -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

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Windows 2000 Support
by Brian Curtin May 3, 2011

May 3, 2011

I'm currently writing a post about the process of removing OS/2 and VMS support and thought about a discussion of Windows 2000 some time back. http://mail.python.org/pipermail/python-dev/2010-March/098074.html makes a proposal for beginning to walk away from 2000, but doesn't appear to come to any conclusion. Was anything decided off the list? I don't see anything in PEP-11 and don't see any changes in the installer made around Windows 2000. If nothing was decided, should anything be done for 3.3?

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Raise OSError or RuntimeError in the OS module?
by Victor Stinner May 3, 2011

May 3, 2011

Hi, I introduced recently the signal.pthread_sigmask() function (issue #8407). pthread_sigmask() (the C function) returns an error code using errno codes. I choosed to raise a RuntimeError using this error code, but I am not sure that RuntimeError is the best choice. It is more an OS error than a runtime error: should signal.pthread_sigmask() raise an OSError instead? signal.signal() raises a RuntimeError if setting the signal handler failed. signal.siginterrupt() raises also a RuntimeError on error. signal.setitimer() and signal.getitimer() have their own exception class: signal.ItimerError, raised on setimer() and getitimer() error. Victor

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Fwd: viewVC shows traceback on non utf-8 module markup
by Michael Foord May 2, 2011

May 2, 2011

I know that the svn repo is now for legacy purposes only, but I doubt it is intended that the online source browser should raise exceptions. (See report below.) All the best, Michael -------- Original Message -------- Subject: viewVC shows traceback on non utf-8 module markup Date: Thu, 28 Apr 2011 17:47:12 +0900 From: Ikkei Shimomura <ikkei.shimomura(a)gmail.com> To: webmaster(a)python.org Hi, here is a report, I found some module markup shows traceback. like this: http://svn.python.org/view/python/trunk/Lib/heapq.py?view=markup > UnicodeDecodeError: 'utf8' codec can't decode byte 0xe7 in position 1428: invalid continuation byte I do not know about latin-1 coding, this is just note what I found at that position It's "\xe7" > ... by Fran\xe7o ... and as I read the traceback, viewvc and pygment assumes utf-8 encoding, its hard-coded. Other modules which use non- utf8 encoding (searched by grep -r coding\: *.py) inspect, pydoc were ok. tarfile, shlex were not. Excute me for my writting broken English. ---- Ikkei Shimomura

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Python 2.6.7 schedule
by Barry Warsaw May 2, 2011

May 2, 2011

I'd like to make a Python 2.6.7 release candidate this Friday, May 6, with a final release scheduled for May 20. I've put these dates on the Python Release Schedule calendar. This will be a source-only security release. I see no release blockers for Python 2.6, so if you know of anything that must go into 2.6.7, please be sure there is a tracker issue for it, that 2.6 is marked as being affected, and with a release blocker priority. Cheers, -Barry

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running/stepping python backwards
by Adrian Johnston May 2, 2011

May 2, 2011

This may seem like an odd question, but I’m intrigued by the idea of using Python as a data definition language with “undo” support. If I were to try and instrument the Python interpreter to be able to step backwards, would that be an unduly difficult or inefficient thing to do? (Please reply to me directly.)

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Issue Tracker
by Ethan Furman May 2, 2011

May 2, 2011

Greetings! I'm not sure where the best place is to ask this question, so I'll start here -- feel free to redirect me if necessary. I would like to have some software to keep track of bugs, to-do's, ideas, etc., etc. -- you know, an issue tracker! Naturally I thought of the one we use to track Python. Is it available? Is it written in Python? Are there any others that are recommended? Thanks! ~Ethan~

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Convert Py_Buffer to Py_UNICODE
by Sijin Joseph May 2, 2011

May 2, 2011

Hi - I am working on a patch where I have an argument that can either be a unicode string or binary data, I parse the argument using the PyArg_ParseTuple method using the s* format specification and get a Py_Buffer. I now need to convert this Py_Buffer object to a Py_Unicode and pass it into a function. What is the best way to do this? If I determine that the passed argument was binary using another flag parameter then I am passing Py_Buffer->buf as a pointer to the start of the data. This is in winsound module, here's the relevant code snippet sound_playsound(PyObject *s, PyObject *args) { Py_buffer *buffer; int flags; int ok; LPCWSTR pszSound; if (PyArg_ParseTuple(args, "s*i:PlaySound", &buffer, &flags)) { if (flags & SND_ASYNC && flags & SND_MEMORY) { /* Sidestep reference counting headache; unfortunately this also prevent SND_LOOP from memory. */ PyBuffer_Release(buffer); PyErr_SetString(PyExc_RuntimeError, "Cannot play asynchronously from memory"); return NULL; } if(flags & SND_MEMORY) { pszSound = buffer->buf; } else { /* pszSound = ????; */ } -- Sijin

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