[docs] [issue901727] extra_path kwarg to setup() undocumented

[Éric Araujo]

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

I added the missing words and reworded a few lines in the attached patch.

That said, I find that the new doc is barely helpful; it describes what the code does, but does not explain why one would want to use it.  Comments in the source suggest it’s a hack to support some corner case.  This is still obscure to me after reading about it and looking at the code :(

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Added file: http://bugs.python.org/file21313/apiref-followup.diff

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