this post was submitted on 26 Sep 2023

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Typed Python: Choose Sequence over List (blog.meadsteve.dev)

submitted 1 year ago by meadsteve@reddthat.com to c/python@programming.dev

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A blog post on choosing more specific types rather than general ones like list and dict.

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[–] chemacortes@programming.dev 2 points 1 year ago (1 children)

Sequence now lives at collections.abc. BTW, float is not a supertype of int (issubclass(int, float) == False). Normaly, It is acceptable to use int instead of float, but speaking of variance, it is more precise to use numbers.Real:

issubclass(Integral, Real) == True
issubclass(int, Real) == True
issubclass(float, Real) == True
issubclass(complex, Real) == False

[–] meadsteve@reddthat.com 2 points 1 year ago

yeah it's an interesting case that an int can be treated as a float. I should probably update my post to mention that it's not strictly a supertype but a special exception mentioned in python's typehinting pep: https://peps.python.org/pep-0484/#the-numeric-tower