On 8/22/2011 11:51 AM, Matthew Brett wrote:
Hi,
I recently ran into this behavior:
import sys import apkg.subpkg del sys.modules['apkg'] import
apkg.subpkg as subpkg
Traceback (most recent call last): File "<stdin>", line 1,
in<module> AttributeError: 'module' object has no attribute 'subpkg'
where 'apkg' and 'subpkg' comprise empty __init__.py files to
simplify the example.
It appears then, that importing a subpackage, then deleting the
containing package from sys.modules, orphans the subpackage in an
unfixable state.
I ran into this because the nose testing framework does exactly this
kind of thing when loading test modules, causing some very confusing
errors and failures.
Is this behavior expected?
It's undefined behavior. You're dealing with CPython implementation
semantics, not Python language semantics.
John Nagle
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