python计算数字或者数组的阶乘的实现

# -*- coding:utf-8 -*-
"""
author: 15025
time: 2021/7/18 17:58
software: PyCharm

Description:
    calculate factorial of a given number
"""


class PythonStudy:
    @staticmethod
    def factorial(n):
        num = 1
        for i in range(1, n + 1):
            num *= i

        return num


if __name__ == "__main__":
    main = PythonStudy()
    result = main.factorial(4)
    print("The final result is: ")
    print(result)
"""
The final result is: 
24
"""

# -*- coding:utf-8 -*-
"""
author: 15025
time: 2021/7/18 17:58
software: PyCharm

Description:
    calculate factorial of a given array
"""
import numpy as np

class NumpyStudy:
    @staticmethod
    def factorial(arr):
        length = len(arr)
        num_arr = np.ones(length)
        for index, value in enumerate(arr):
            for i in range(1, value + 1):
                num_arr[index] *= i

        return num_arr


if __name__ == "__main__":
    main = NumpyStudy()
    array = np.arange(11)
    result = main.factorial(array)
    print("The final result is: ")
    print(result)
"""
The final result is: 
[1.0000e+00 1.0000e+00 2.0000e+00 6.0000e+00 2.4000e+01 1.2000e+02
 7.2000e+02 5.0400e+03 4.0320e+04 3.6288e+05 3.6288e+06]
"""