To check palindrome loops.

palindrome.py

#To check whether a string is a palindrome or not.
s=input('Enter a word')
l=len(s)
mid=l//2
rev=-1
for a in range(l):
    if s[a]==s[rev]:
        rev-=1
    else:
        print("not a palindrome")
        break
else:
    print(s,'Is a palindrome')