"""
python/black : True
"""
from typing import List


def prime_factors(n: int) -> List[int]:
 """
 Returns prime factors of n as a list.

 >>> prime_factors(0)
 []
 >>> prime_factors(100)
 [2, 2, 5, 5]
 >>> prime_factors(2560)
 [2, 2, 2, 2, 2, 2, 2, 2, 2, 5]
 >>> prime_factors(10**-2)
 []
 >>> prime_factors(0.02)
 []
 >>> x = prime_factors(10**241) # doctest: +NORMALIZE_WHITESPACE
 >>> x == [2]*241 + [5]*241
 True
 >>> prime_factors(10**-354)
 []
 >>> prime_factors('hello')
 Traceback (most recent call last):
 ...
 TypeError: '<=' not supported between instances of 'int' and 'str'
 >>> prime_factors([1,2,'hello'])
 Traceback (most recent call last):
 ...
 TypeError: '<=' not supported between instances of 'int' and 'list'

 """
 i = 2
 factors = []
 while i * i <= n:
 if n % i:
 i += 1
 else:
 n //= i
 factors.append(i)
 if n > 1:
 factors.append(n)
 return factors


if __name__ == "__main__":
 import doctest

 doctest.testmod()