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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 9 Jan 2015 15:49:54 -0700
Subject: Re: Non-unique dirs in sys.path
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On Fri, Jan 9, 2015 at 2:24 PM, Gisle Vanem <gvanem@yahoo.no> wrote:
> Ian Kelly wrote:
>
>> I checked my own Python 2.7 installation and discovered that I have
>> the same problem, although without the different casing. Perusing the
>> .pth files in site-packages turns up setuptools.pth, which just
>> contains the site-packages path. Removing that file solves the issue
>> for me.
>
>
> That was the case here too! Deleted my setuptools.pth and the "problem"
> was gone. It would be nice to know how these .pth files are involved in
> extending the 'sys.path[]'. Who does that and how? Any good reference on
> that?

The automatically imported site module processes the .pth files.

https://docs.python.org/2/library/site.html