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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sun, 11 Jan 2015 23:00:45 -0700
Subject: Re: importing os.path -- why does it work?
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On Sun, Jan 11, 2015 at 10:31 PM, Steven D'Aprano <steve@pearwood.info> wrote:
> But bizarrely, you can import os.path this way!
>
> py> import os.path
> py> os.path
> <module 'posixpath' from '/usr/local/lib/python3.3/posixpath.py'>
> py> os.__package__
> ''
>
>
>
> By what wizardry does this work?

By the wizardry of adding an entry to sys.modules.

https://hg.python.org/cpython/file/8b3c609f3f73/Lib/os.py#l112