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Disallow List[int] etc. as expressions #556
Description
The current PEP 484 draft does not allow writing code like this:
x = List[int]()
Instead, the recommended way is using type annotations:
x = [] # type: List[int]
# or
y = Undefined(List[int])
y = []
See also: python/typing#9
Activity
gvanrossum commentedon Apr 6, 2016
(The PEP went back and forth a few times; Undefined was removed. Right now the PEP suggests using either a
# typecomment or defining an alias, e.g.IntList = List[int]after which you can sayy = IntList().)