[英]Recursive Function inside While loop (Python)
因此,我正在学习Python中的递归,并且我有一些代码可以找到用户输入的数字的阶乘。
def recursion(x):
if x == 1:
return 1
else:
return(x * recursion(x - 1))
num = int(input("Enter a non-negative integer: "))
if num >= 1:
print("The factorial of", num, "is", recursion(num))
此代码可以正常工作。 也就是说,它将询问指定的问题,允许用户输入,并找到数字的阶乘。 所以我想做的是将递归函数放在While循环中,以便程序在打印提交的数字的阶乘后,询问用户是否要输入另一个数字。
loop = 1
while loop == 1:
def recursion(x):
if x == 1:
return 1
else:
return(x * recursion(x - 1))
num = int(input("Enter a non-negative integer: "))
if num >= 1:
print("The factorial of", num, "is", recursion(num))
print()
answer = input(print("Would you like to find the factorial of another non-negative integer? Y/N: "))
if answer == "Y":
loop = 1
else:
loop = 0
我在这段代码中遇到的问题是,它将要求用户输入一个输入数字,找到阶乘,然后问“是否要查找另一个非负整数的阶乘?是/否:”问题,但是当我在IDLE中运行此代码时,上述问题后的行显示“无”。
Python 3.5.0 (v3.5.0:374f501f4567, Sep 13 2015, 02:27:37)
[MSC v.1900 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
Enter a non-negative integer: 6
The factorial of 6 is 720
Would you like to find the factorial of another non-negative integer? Y/N:
NoneY
Enter a non-negative integer: 4
The factorial of 4 is 24
Would you like to find the factorial of another non-negative integer? Y/N:
NoneN
>>>
我浏览了Python文档(第4.6节) ,其中提到解释器通常禁止显示“ None”。
之所以看到“ None
是因为您的input
有print
内容:
input(print("Would you like to find the factorial of another non-negative integer? Y/N: "))
删除该print
input("Would you like to find the factorial of another non-negative integer? Y/N: ")
这行:
answer = input(print("Would you like to find the factorial of another non-negative integer? Y/N: "))
print
返回None
,所以您要在阶乘函数中输入None
,然后给出None
作为答案。
应该:
answer = input("Would you like to find the factorial of another non-negative integer? Y/N: ")
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