abhi9uPython Performance: Why 'if not list' is 2x Faster Than Using len()
AvicennaYea and then you use “not” with a variable name that does not make it obvious that it is a list and another person who reads the code thinks it is a bool. Hell a couple of months later you yourself wont even understand that it is a list. You should not sacrifice code readability for over optimization, this is phyton after all I don’t think list lengths will be your bottle neck.
if you’re worried about readability you can leave a comment.
Better yet, a type hint.
foo: list | None can be checked by static analysis, # foo is a list isn’t.