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]
"""