python - 用while循环python写阶乘

Question

我是新手，对 Python 了解不多。有人知道如何在 while 循环中编写阶乘吗？

我可以在 if/elif else 语句中实现:

num = ...
factorial = 1

if num < 0:
   print("must be positive")
elif num == 0:
   print("factorial = 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i
   print(num, factorial)

但我想用一个 while 循环(无功能)来做到这一点。

Answer 1

while num > 1:
    factorial = factorial * num
    num = num - 1