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 wasabi@feddit.de to c/python@programming.dev

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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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[–] InsecureSignpost@kbin.social 3 points 1 year ago

In addition to what others have said, collection literals are also faster. list[str]() performs a function call that technically might not be the built-in list. Where [] is always an empty list and it can be created with less overhead.