英文:
Valid Python line with undefined variable and annotation
问题
我遇到了一个帖子，其中有一个带有一些类型注释的未定义变量名。 这一行是有效的。 它是什么，有哪些可能的用途？
>>> x: int
>>> x
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined
英文:
I have come accros a post with undefined variable name with some type annotation. The line is valid. What it does and what are possible usages?
>>> x: int
>>> x
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined
答案1
得分: 1
Type hinting a variable gives static type checkers an idea of what type a variable is going to be, before it is assigned with anything.
英文:
Type hinting a variable gives static type checkers an idea of what type a variable is going to be, before it is assigned with anything:
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