[New-bugs-announce] [issue13487] inspect.getmodule fails when module imports change sys.modules

Erik Tollerud report at bugs.python.org
Sun Nov 27 04:06:49 CET 2011

New submission from Erik Tollerud <erik.tollerud at gmail.com>:

The inspect.getmodule function crashes if packages are installed that futz with sys.modules while they are being tested for module status or the like.  I'm not actually sure which packages are doing this, but the symptom is the for loop over sys.modules raises an Exception because it is modified while the loop is running.

This is *not* a problem in Python 2.x because sys.modules.items() returns a copy of the dictionary instead of an iterator, and 3.x changes that behavior.  The comment above the for loop makes it clear that the expected behavior is a copy rather than an iterator, so the attached patch corrects the problem by simply wrapping the items() call in list().

components: Library (Lib)
files: getmodulefix.patch
keywords: patch
messages: 148438
nosy: Erik.Tollerud
priority: normal
severity: normal
status: open
title: inspect.getmodule fails when module imports change sys.modules
versions: Python 3.1, Python 3.2, Python 3.3
Added file: http://bugs.python.org/file23790/getmodulefix.patch

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