mypy, type hint: Union[float, int] -> is there a Number type?

Question

mypy is really handy and catches a lot of bugs, but when I write \"scientific\" applications, I often end up doing:

def my_func(number: Union[float, int]):
    #         


        

Answer 1

For people who come to this question for the more general problem of Union typing hints for entities which don't have an existing supertype in common, for example Union[int, numpy.ndarray], the solution is to import Union from typing.

Example 1:

from typing import Union

def my_func(number: Union[float, int]):
    # Do something

Example 2:

from typing import Union
import numpy as np

def my_func(x: Union[float, np.ndarray]):
    # do something
    # Do something