How can I write a Python program to check if a string is a palindrome or not without reversing the original string?

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Michael Devine

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By reversing, the rhs will return the reverse of the string. >>> s='malayalam'>>> 'is a palindrome' if s==s else 'not a palindrome''is a palindrome'>>> >>> s=input('enter a string... ')enter a string... racecar>>> 'is a palindrome' if s==s else 'not a palindrome''is...
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By reversing, the rhs will return the reverse of the string. >>> s='malayalam'>>>'is a palindrome' if s==s[::-1] else 'not a palindrome''is a palindrome'>>>>>> s=input('enter a string... ')enter a string... racecar>>> 'is a palindrome' if s==s[::-1] else 'not a palindrome''is a palindrome'>>> s=input('enter a string... ')enter a string... a string>>> 'is a palindrome' if s==s[::-1] else 'not a palindrome''not a palindrome'>>> _______________________________________________________________________________ Otherwise, you can check each character in the string read from the front against each character read from the back.. >>> s='malayalam'>>>for i in range(len(s)): if s[i]!=s[-(i+1)]: 'not a palindrome' break else: Noneelse: 'is a palindrome' 'is a palindrome'>>> s='rotor'>>> for i in range(len(s)): if s[i]!=s[-(i+1)]: 'not a palindrome' break else: Noneelse: 'is a palindrome' 'is a palindrome'>>> s='qwerty'>>> for i in range(len(s)): if s[i]!=s[-(i+1)]: 'not a palindrome' break else: Noneelse: 'is a palindrome 'not a palindrome'>>> read less
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