not executable on Python 2.7

[pytestbot]

Originally reported by: Simon Liedtke (BitBucket: derdon, GitHub: derdon)

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After trying to execute py.test, the following traceback occured: http://paste.pocoo.org/show/274612/

This is <> says about it (copied from #pylib):

derdon: seems like that is a python2.7 only bug

derdon: seems like the namespace hook broke

derdon: yup, the issue is pretty much the lack of the namespace hook being executed

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/3

[pytestbot]

Original comment by Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt):

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on closer introspection it seems the namespace hook for session return a bogus None
will search further

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

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this is an "in-progress" problem - mixing old "py" installs and new "pytest" will break. I added an assertion in pytest to avoid this mixup and plan to set up requirements for releases such that it cannot happen at all.