python kata challenge.

numbers.py

import numpy as np
NaN = np.nan 

def is_nums(numbers : tuple) -> bool:
    return all((isinstance(num, (int,float)) for num in numbers))
  
#is_nums(1, 4, 3, 2, 5)
#True
#is_nums(1, "a", 3)
#False
#is_nums(1, 3, NaN)
#True