Program successfully executed with exit code 0 but nothing is printed

Question

The code is getting compiled successfully but no message is being displayed, i.e no print command is being executed.

What's the error in my Python 3.7 code?

def isPalindrome(n):
    s=0
    while n!=0 :
        d=n%10
        s+=d
        s*=10
        n/=10
    if n==s :
        return True
    else :
        return False

def main():
    if isPalindrome(252) :
        print('252 is a Palindrome Number')
    else :
        print('252 is not a Palindrome number')

`main` will not execute when you run the program. Add `if __name__ == "__main__": main()` to the bottom of your program. — modesitt, Apr 17 '20 at 20:34
Does this answer your question? [What does if \_\_name\_\_ == "\_\_main\_\_": do?](https://stackoverflow.com/questions/419163/what-does-if-name-main-do) — modesitt, Apr 17 '20 at 20:35

score 1 · Answer 1 · answered Apr 17 '20 at 20:41

main doesn't execute on it's own in Python.

You can put it in:

if __name__ == "__main__":
    main()

or you can just put main() outside entirely, like so...

def isPalindrome(n):
    s=0
    while n!=0 :
            d=n%10
            s+=d
            s*=10
            n/=10
    if n==s :
            return True
    else :
            return False

def main():
    if isPalindrome(252) :
            print('252 is a Palindrome Number')
    else :
            print('252 is not a Palindrome number')

main()

the former is better if you want to import the function into another program.

But the latter is fine if it's just a stand alone program

score 0 · Answer 2 · answered Apr 17 '20 at 20:35

0

Add this

if __name__ == "__main__":
    main()

answered Apr 17 '20 at 20:35

yudhiesh

6,383
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score 0 · Answer 3 · answered Apr 17 '20 at 20:47

You don't need to define main here. Below will do for you .

def isPalindrome(n):
        s=0
        while n!=0 :
                d=n%10
                s+=d
                s*=10
                n/=10
        if n==s :
                return True
        else :
                return False


if isPalindrome(252) :
        print('252 is a Palindrome Number')
else :
        print('252 is not a Palindrome number')

Program successfully executed with exit code 0 but nothing is printed

3 Answers3