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pre-commit-python: Allow line breaks between binary operators

Merged Alicia Boya García requested to merge ntrrgc/gst-devtools:python-style-warnings into master

pre-commit-python overrides the list of ignored Python style errors. Unfortunately, before this patch the list did not exclude W503 and W504 (which are otherwise ignored by default).

The consequence of having those two warnings enabled at the same time is that it's not possible to break lines on binary operators, which is an unreasonable unintentional restriction:

  'validateflow': "validateflow, expectations-dir=\"" +
                  expectations_dir + "\", actual-results-dir=\"" +
                  actual_results_dir + "\"",

W504 line break after binary operator

  'validateflow': "validateflow, expectations-dir=\""
                  + expectations_dir + "\", actual-results-dir=\""
                  + actual_results_dir + "\"",

W503 line break before binary operator

This patch excludes W503 so that there is a valid style for breaking lines on binary operators.

Edited by Alicia Boya García