无法在Python中进行阶乘函数 [英] Unable to make a factorial function in Python

问题描述

我的代码

import sys

number=int(sys.argv[1])

if number == 0
    fact=1
else
    fact=number
for (x=1; x<number; x++)
    fact*=x;             // mistake probably here

print fact

我得到了错误

File "factorial.py", line 5
    if number == 0
                 ^
SyntaxError: invalid syntax

如何在Python中创建阶乘函数?

推荐答案

这是您的代码，已修复并正常工作:

Here's your code, fixed up and working:

import sys
number = int(sys.argv[1])
fact = 1
for x in range(1, number+1):
    fact *= x

print fact

(对于任何一个不知道的人，零零都是一个-我必须查一下.8-)

(Factorial zero is one, for anyone who didn't know - I had to look it up. 8-)

在if，else，for等之后需要冒号，并且for在Python中的工作方式不同于C.

You need colons after if, else, for, etc., and the way for works in Python is different from C.

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