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. 我试过了:

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

for i: int in range(5):
    pass

但是显然没有用.

我期望在PyCharm 2016.3.2中可以自动完成. 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.

P.S. PyCharm> = 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:

此外，一个无法注释for或with中使用的变量 声明；可以提前注释它们，方法类似于 元组拆包

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

在循环之前对其进行注释:

Annotate it before the loop:

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

---

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

---

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

这篇关于如何在for循环中注释类型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！