During a conversation today, I realised that the convention of
returning None from methods that change an object's state isn't
captured the Programming Recommendations section of PEP 8.
Specifically, I'm referring to this behaviour:
>>> [].sort() is None
True
>>> "ABC".lower() is None
False
That's a deliberate design choice, and one that has been explained a
few times on the list when folks ask why "[].sort().reverse()" doesn't
work when "'ABC'.lower().replace('-', '_')" does.
Would it be worth adding such a note? Or is it out of scope?
Cheers,
Nick.
--
Nick Coghlan | [email protected] | Brisbane, Australia
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