[issue29144] Implicit namespace packages in Python 3.6

[Lumír Balhar]

Lumír Balhar added the comment:

Hello.

I've tried the build of python-moksha-common on Fedora rawhide [0] and Fedora 25 [1].

Fedora rawhide: Python 2.7.13 and 3.6.1, setuptools 36.2.0
Fedora 25: Python 2.7.13 and 3.5.3, setuptools 25.1.1

Source tarball of moksha.common contains pkg_resources-style __init__.py file and the setuptools skipped installation of this file in all (four) cases.

It seems that setuptools do the same in all versions but the problem comes with Python 3.6 which is more strict than Python 3.5 in behavior related to namespace packages.

So, when one part of namespace package doesn't contain __init__.py file and other part contains pkg_resources-style __init__.py file:
- in Python 2.7 and 3.5 everything works
- in Python 3.6 submodules cannot import each other

The question is whether it is a bug/feature in Python 3.6 and setuptools should install pkg_resources-style __init__.py or not.

What do you think?

[0] https://koji.fedoraproject.org/koji/taskinfo?taskID=20606746
[1] https://koji.fedoraproject.org/koji/taskinfo?taskID=20606838

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29144>
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