Paul Moore <p.f.mo...@gmail.com> added the comment:

The "backports" module you refer to as being in site-packages is not shipped 
with the standard library, it's a 3rd party addon that presumably you installed 
yourself. You'll need to let us know what you did to install it.

You say you manipulate sys.path manually in your code. Please provide:

1. the value of sys.path before you change it.
2. The value of sys.modules.get('backports') before you change sys.path.
3. the value of sys.path after you change it.
4. The value of sys.modules.get('backports') after you change sys.path.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31741>
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