No Python source warning for namespace modules

[nedbat]

Originally reported by Christian Heimes (Bitbucket: tiran, GitHub: tiran)

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setuptools no longer installs a __init__.py for namespace packages. Now I'm getting a warning Coverage.py warning: Module custudia has no Python source. for a namespace package called custodia. You can easily reproduce the issue with a git checkout of https://github.com/latchset/custodia:

Reproducer:

$ git clone https://github.com/latchset/custodia.git
$ cd custodia
$ tox -e py27
...
=================================================================================== 101 passed in 11.23 seconds ====================================================================================
Coverage.py warning: Module custodia has no Python source.
_____________________________________________________________________________________________ summary ______________________________________________________________________________________________
  py27: commands succeeded
  congratulations :)

On both Python 2 and 3, a namespace module has a __path__ attribute but no __file__ attribute. May I suggest that you omit the warning when a module has no __file__ but a __path__?

$ cd /tmp
$ mkdir nsexample
$ touch nsexample/module.py
$ python3
>>> import nsexample
>>> import nsexample.module
>>> dir(nsexample)
['__doc__', '__loader__', '__name__', '__package__', '__path__', '__spec__', 'module']
>>> dir(nsexample.module)
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']

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• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/572

[nedbat]

When I try the custodia example, I get different output, without that warning. Can you provide a runnable example that produces that exact warning?

[nedbat]

Original comment by Christian Heimes (Bitbucket: tiran, GitHub: tiran)

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Here is a travis job with a reproducer: https://travis-ci.org/tiran/custodia/jobs/227995541

[nedbat]

Original comment by Christian Heimes (Bitbucket: tiran, GitHub: tiran)

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https://github.com/tiran/covns is a minimal reproducer for the problem

GLOB sdist-make: .../covns/setup.py
py27 inst-nodeps: .../covns/.tox/dist/covns-0.1.zip
py27 installed: appdirs==1.4.3,coverage==4.3.4,covns==0.1,packaging==16.8,py==1.4.33,pyparsing==2.2.0,pytest==3.0.7,six==1.10.0
py27 runtests: PYTHONHASHSEED='388494413'
py27 runtests: commands[0] | .../covns/.tox/py27/bin/python -m coverage run --parallel -m pytest --capture=no --strict
=============================================================== test session starts ===============================================================
platform linux2 -- Python 2.7.13, pytest-3.0.7, py-1.4.33, pluggy-0.4.0
rootdir: .../covns, inifile: tox.ini
collected 1 items 

tests.py .

============================================================ 1 passed in 0.02 seconds =============================================================
Coverage.py warning: Module covns has no Python source.
_____________________________________________________________________ summary _____________________________________________________________________
  py27: commands succeeded
  congratulations :)

[nedbat]

Fixed in 66dd7fd60798 (bb).