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Fri Aug 19 12:40:03 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-August/145853.html

On 8/19/2016 12:10 PM, Chris Angelico wrote:
> On Sat, Aug 20, 2016 at 1:26 AM, Steve Dower <steve.dower at python.org> wrote:
>> Check any .pth files you can find. I suspect mpl_toolkits has some magic in
>> it to make the namespace package work on 2.7.
>
>>>> sys.path
> ['/usr/local/lib/python36.zip', '/home/rosuav/cpython/Lib',
> '/home/rosuav/cpython/Lib/plat-x86_64-linux-gnu',
> '/home/rosuav/cpython/build/lib.linux-x86_64-3.6',
> '/usr/local/lib/python3.6/site-packages']
>
> /usr/local/lib/python36.zip doesn't exist. In
> /usr/local/lib/python3.6/site-packages are a bunch of things that I've
> installed using pip, but grepping for '/usr' in the -v output comes up
> blank. There is, however, one .pth file there:
>
> $ cat /usr/local/lib/python3.6/site-packages/matplotlib-1.5.1-py3.6-nspkg.pth
> import sys, types, os;p =
> os.path.join(sys._getframe(1).f_locals['sitedir'],
> *('mpl_toolkits',));ie =
> os.path.exists(os.path.join(p,'__init__.py'));m = not ie and
> sys.modules.setdefault('mpl_toolkits',
> types.ModuleType('mpl_toolkits'));mp = (m or []) and
> m.__dict__.setdefault('__path__',[]);(p not in mp) and mp.append(p)
>
> Is it possible that that's the cause?

Change 'pth' to 'pthx' and try it.

> And if so, should "python -I"
> remove /usr/local/lib/python3.6/site-packages from sys.path?

-- 
Terry Jan Reedy

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[Python-Dev] Failures in test_site.py - how to debug?