[Python-Dev] On breaking modules into packages Was: [issue10199] Move Demo/turtle under Lib/

[Michael Foord]

On 03/11/2010 14:17, Antoine Pitrou wrote:
> Le mercredi 03 novembre 2010 à 14:16 +0000, Michael Foord a écrit :
>> On 03/11/2010 14:05, Nick Coghlan wrote:
>>> On Wed, Nov 3, 2010 at 9:32 AM, Raymond Hettinger
>>> <raymond.hettinger at gmail.com>   wrote:
>>>> Sounds like a decision to split a module into a package is a big commitment.  Each of the individual file names becomes a permanent part of the API.  Even future additional splits are precluded because it might break someones dotted import (i.e. not a single function can be moved between those files -- once in unittest.utils, alway in unittest.utils).
>>> Can Python 2.7 pickles containing unittest classes be unpickled using
>>> 2.6 or earlier? Even if nobody uses the new names for imports, I
>>> believe they implicitly end up included in any pickles involving
>>> affected classes (I seem to recall we've been bitten by that before
>>> when moving things around).
>> Yes, since unittest.TestCase is still available (as are all the names).
>> I believe so anyway...
> unittest.TestCase is not really pickleable. There were
> test_multiprocessing issues because of that (see recent SVN checkins).

Interesting. We made some fixes before 2.7 to ensure they were copyable, 
but we fixed this in the copy module. TestCase instances now store some 
method objects in a dictionary which may make them unpickleable, so that 
could be a new problem. I'll test with 2.6 and 2.7 to see.

An easy fix would be to store the method names rather than the method 
objects themself (if this is indeed the cause of the problem). This is 
what unittest2 does so that it works with earlier versions of Python 
that don't have the fix we put in copy.

Michael

> Regards
>
> Antoine.
>
>
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