New submission from Arfrever Frehtes Taifersar Arahesis
<arfrever....@gmail.com>:
It's undocumented that imp.find_module("") and imp.find_module(".") try to find
__init__.py.
There is also a small difference in behavior between them.
sys.path by default contains "" as the first element, which is sufficient for
imp.find_module("."), but not for imp.find_module(""):
$ mkdir /tmp/imp_tests
$ cd /tmp/imp_tests
$ touch __init__.py
$ python3.3 -c 'import imp, sys; print(repr(sys.path[0]));
print(imp.find_module("."))'
''
(None, '.', ('', '', 5))
$ python3.3 -c 'import imp, sys; print(repr(sys.path[0]));
print(imp.find_module(""))'
''
Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named ''
If sys.path contains path (e.g. "." or absolute path) to directory with
__init__.py file, then imp.find_module("") will succeed:
$ PYTHONPATH="." python3.3 -c 'import imp, sys; print(repr(sys.path[0:2]));
print(imp.find_module("."))'
['', '/tmp/imp_tests']
(None, '.', ('', '', 5))
$ PYTHONPATH="." python3.3 -c 'import imp, sys; print(repr(sys.path[0:2]));
print(imp.find_module(""))'
['', '/tmp/imp_tests']
(None, '/tmp/imp_tests/', ('', '', 5))
$ python3.3 -c 'import imp, sys; sys.path.insert(1, ".");
print(repr(sys.path[0:2])); print(imp.find_module("."))'
['', '.']
(None, '.', ('', '', 5))
$ python3.3 -c 'import imp, sys; sys.path.insert(1, ".");
print(repr(sys.path[0:2])); print(imp.find_module(""))'
['', '.']
(None, './', ('', '', 5))
I think that imp.find_module(".") and imp.find_module("") should have the same
behavior, and this behavior should be documented.
----------
assignee: docs@python
components: Documentation, Interpreter Core
messages: 144531
nosy: Arfrever, docs@python
priority: normal
severity: normal
status: open
title: imp.find_module("") and imp.find_module(".")
versions: Python 2.7, Python 3.2, Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13047>
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