Soften restriction for runtime generics in PEP 484#120
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gvanrossum merged 1 commit intopython:masterfrom Oct 24, 2016
Merged
Soften restriction for runtime generics in PEP 484#120gvanrossum merged 1 commit intopython:masterfrom
gvanrossum merged 1 commit intopython:masterfrom
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LGTM, I'll merge this once the mypy PR is merged. |
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Yay! |
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Fixes python/typing#303
@gvanrossum Please take a look. I made a PR to allow this in mypy python/mypy#2302 . Here I just propose to soften the restriction, i.e., avoid "must".
As a motivation, in Python one always can substitute expressions, so that if
IntNode = Node[int]; IntNode()works, then it is reasonable to also allowNode[int], but say that the first way is preferred.