Ezio Melotti firstname.lastname@example.org added the comment:
I'm not sure it's worth adding this to the PEP 7. The PEP is about conventions and style not idioms. PEP 8 has a section about "Programming Recommendations" that contains a few idioms, but since PEP 7 doesn't have an equivalent section, I think that explaining this idiom (and not others) will look out of place.
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