[docs] [issue11298] unittest discovery needs better explanation

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I’m not sure what’s best between the proposed addition and a link to the definition of module/importable.  I think that programmers should know that not all file names are valid module names, so I wouldn’t want us to copy the definition all over the docs.  Thoughts?

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nosy: +eric.araujo

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<http://bugs.python.org/issue11298>
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