型アノテーションは単体に対して使えない。
下記のように事前に定義して書くしかなさそう。
参考:PEP526
動く
a: int
b: str
a, b = 1, "hello"
from typing import Tuple
c: Tuple[int,str] =1, "hello"
これらはできない
(a,b) :Tuple[int,str] = 1, "hello"
a, b :int, str = 1, "hello"
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