如何在python3中注释生成器? [英] How to annotate a generator in python3?

问题描述

Python 3.x 支持(可选)函数注解:

Python 3.x supports (optional) function annotations:

def add_ints(x:int, y:int) -> int :
    return x+y

我有时会遇到关于如何表示可以表示给定类型"的问题，这一次，我有一个返回生成器的函数:

I sometimes encounter problems as to how to represent a given "type" can be represented, and this time, I have a function that returns a generator:

def myfunc(x: [int]) -> "generator that returns ints":
    #                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
    return (n for n in x if n%2 == 0)

我应该如何注释返回值?有什么参考资料可以参考吗?

How should I annotate the return value? Is there any reference I can consult to?

推荐答案

typing module 定义了 Generator 类型，你可以像这样使用:

The typing module defines the Generator type, which you can use like:

Generator[yield_type, send_type, return_type] 

另见PEP 0484.

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