this post was submitted on 12 Sep 2023

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Has using 'thing = liststr <>' instead of 'thing: list[str] = []' any downsides? (feddit.de)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/python

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I have seen some people prefer to create a list of strings by using thing = list[str]() instead of thing: list[str] = []. I think it looks kinda weird, but maybe that's just because I have never seen that syntax before. Does that have any downsides?

It is also possible to use this for dicts: thing = dict[str, SomeClass](). Looks equally weird to me. Is that widely used? Would you use it? Would you point it out in a code review?

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[–] [email protected] 12 points 1 year ago (1 children)

You'd always want to use varname: type_description = initial_value pattern. It's readable, is the same pattern you use in method params, and linters and IDEs recognize this pattern. And it makes sense for the type description be on the left side of the assignment operator, together with the variable it's describing.

[–] qwop 1 points 1 year ago

I'm pretty sure most type checkers recognise both forms.