`Iterable [(int,int)]`tuple在类型提示中是不允许的

Question

我有这个非常简单的代码:

from typing import List, Iterable

Position = (int, int)
IntegerMatrix = List[List[int]]

def locate_zeros(matrix: IntegerMatrix) -> Iterable[Position]:
    """Given an NxM matrix find the positions that contain a zero."""
    for row_num, row in enumerate(matrix):
        for col_num, element in enumerate(row):
            if element == 0:
                yield (col_num, row_num)

这是错误:

Traceback (most recent call last):
  File "type_m.py", line 6, in <module>
    def locate_zeros(matrix: IntegerMatrix) -> Iterable[Position]:
  File "/usr/lib/python3.5/typing.py", line 970, in __getitem__
    (len(self.__parameters__), len(params)))
TypeError: Cannot change parameter count from 1 to 2

为什么我不能将一对可迭代的Int对作为返回类型？

无论-> Position和Iterable[Any]工作,只是没有Iterable和Position在一起没有.

Answer 1

您应该使用typing.Tuple[int, int]声明元组类型Position,而不是(int, int).