Python中的Numpy类型提示(PEP 484) [英] Numpy type hints in Python (PEP 484)

问题描述

我想向使用numpy数组作为输入并返回字符串的方法中添加类型提示.这个numpy数组包含浮点数，所以我尝试了:

I would like to add type hints to a method that takes a numpy array as an input, and returns a string. This numpy array contains floats so I tried:

import numpy as np
def foo(array: np.ndarray[np.float64]) -> str:

但是由于TypeError: 'type' object is not subscriptable而无法使用.

我发现了此，但是无法按照讨论进行！

I found this but could not follow the discussions!

推荐答案

查看 nptyping .它为numpy数组提供类型提示.

Check out nptyping. It offers type hints for numpy arrays.

以您的情况而言，您最终会得到:

In your case, you would end up with:

import numpy as np
from nptyping import Array

def foo(array: Array[np.float64]) -> str:
    ...

您也可以检查实例:

arr = np.array([[1.0, 2.0],
                [3.0, 4.0],
                [5.0, 6.0]])
isinstance(arr, Array[np.float64, 3, 2])  # True

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