如何在 for 循环中注释类型 [英] How do I annotate types in a for-loop

问题描述

我想在 for 循环中注释变量的类型.我试过这个:

I want to annotate a type of a variable in a for-loop. I tried this:

for i: int in range(5):
    pass

但显然没有用.

我期望在 PyCharm 2016.3.2 中自动完成.像这样的预注释:

What I expect is working autocomplete in PyCharm 2016.3.2. Pre-annotation like this:

i: int
for i in range(5):
    pass

没有帮助.

附言PyCharm 的预注释 >= 2017.1

P.S. Pre-annotation works for PyCharm >= 2017.1

推荐答案

根据 PEP 526，这是不允许的:

According to PEP 526, this is not allowed:

此外，不能注释for或with中使用的变量声明；它们可以以类似的方式提前注释元组解包

In addition, one cannot annotate variables used in a for or with statement; they can be annotated ahead of time, in a similar manner to tuple unpacking

在循环之前注释:

i: int
for i in range(5):
    pass

<小时>

PyCharm 2018.1 及更高版本 现在可以识别循环内变量的类型.较旧的 PyCharm 版本不支持此功能.

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PyCharm 2018.1 and up now recognizes the type of the variable inside the loop. This was not supported in older PyCharm versions.

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