Added test case and fix for cython pure python import

[jtoledo1974]

Here is a test case demostrating the issue. I'll try to produce a patch as well.

[jtoledo1974]

Added fix for the test case that fixes #2062

[staticdev]

@jtoledo1974 thank you for the fix. Just curious, in your first commit adding the test it does not fail in CI. It should, right?

[codecov]

Codecov Report

Merging #2063 (9b37e89) into main (98390f5) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2063   +/-   ##
=======================================
  Coverage   98.80%   98.80%           
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  Files          38       38           
  Lines        3084     3084           
  Branches      745      745           
=======================================
  Hits         3047     3047           
  Misses         26       26           
  Partials       11       11           

[jtoledo1974]

@jtoledo1974 thank you for the fix. Just curious, in your first commit adding the test it does not fail in CI. It should, right?

In my fork of isort from master, the first commit that added the test was failing (it was turning the import into a cimport). With the second commit that adds the fix the test does not fail.

I'm not sure if that is what you were asking, though.