[Python-bugs-list] [ python-Bugs-698282 ] __file__ attribute missing from dynamicly loaded module

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Bugs item #698282, was opened at 2003-03-05 21:52
Message generated for change (Comment added) made by loewis
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Category: Python Interpreter Core
Group: Python 2.2.2
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: David C. Sweeton (dsweeton)
Assigned to: Nobody/Anonymous (nobody)
Summary: __file__ attribute missing from dynamicly loaded module

Initial Comment:
Only the first instanceof a dynamically loaded module 

gets the __file__ attribute. It is missing from all later 

instances.



The problem is in importdl.c in the function 

_PyImport_LoadDynamicModule. The first time a 

module is loaded a copy of its module dictionary is 

made by a call to _PyImport_FixupExtension. After that 

copy was made, _PyImport_LoadDynamicModule adds 

the _file__ attribute to the original module dictionary. 

Thus the first instance of the module has the 

__file__attribute.



Later when another instance of the module loads, its 

module dictionary is duplicated from the copy of the 

dictionary from the first instance. The problem is that 

when that copy was made, the __file__ attribute was not 

yet there. Thus the later instance of the module does 

not have the __file__ attribute.



The required fix is in importdl.c and consists of simply 

moving the call of _PyImport_FixupExtension to a point 

just after the __file__ attribute is added, instead of just 

before it. I have tested this fix and it solves the problem.



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>Comment By: Martin v. Löwis (loewis)
Date: 2003-09-04 20:48

Message:
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This is fixed with patch 794826, in importdl.c  2.71 and

2.70.14.1, NEWS 1.831.4.31.

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Comment By: Shack Toms (shacktoms)
Date: 2003-08-25 20:04

Message:
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user_id=603293

This only appears to be a problem when embedding multiple 

python interpreters in a single application, when more than 

one interpreter does an import that refers to the __file__ 

attribute.   Maybe this would also be a problem for the 

Apache mod_python?  In any case, I have a cdiff file based 

on revision 2.70 of importdl.c.   I hope it can be incorporated.

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