[TIP] Patching __import__

[Kumar McMillan]

On Tue, May 24, 2011 at 1:16 PM, Michael Foord <michael at voidspace.org.uk> wrote:
> Right, but the point is that using patch.dict *isn't* an import hook. It
> only adds (and then removes or restores) that entry from the sys.modules
> dict when the decorated test is executed.
>
> *However*, it does get a reference to the sys.modules dictionary at import
> time (to know which dictionary to patch) - and as the problem is happening
> you're probably right about why. It's just that getting a reference to
> sys.modules is not unusual in Python code, so I don't think it is "playing
> with fire". It is a very odd interaction.

Yeah, it definitely should be possible to munge sys.modules without
ill effects.  If you can pinpoint it in Nose, please file a bug :)
http://code.google.com/p/python-nose/

I haven't fully thought it through but you might be able to implement
this feature cleaner as an actual import hook.

>
> All the best,
>
> Michael Foord
>
>> You could try:
>>
>> nosetests --debug=nose.importer,nose.inspector,nose.selector
>>
>> to see if that gives you some clues before / after commenting out the
>> @patch.dict line.  You could also try:
>>
>> nosetests --no-path-adjustment
>>
>> to turn off the import hooks.
>>
>>
>>> Tried to debug it a bit but no luck...
>>> Any ideas?
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>
> --
> http://www.voidspace.org.uk/
>
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>