Palindrome

def isPalindrome(string):
    rev_string = string[::-1]
    return string == rev_string

def isPalindrome2(string):
    rev_string = ''.join(reversed(string))
    return string == rev_string

def isPalindrome3(string):
    left, right = 0, len(string) - 1
    while right >= left:
        if not string[left] == string[right]:
            return False
        left += 1
        right -= 1
    return True

print(isPalindrome('redrum murder'))
print(isPalindrome2('redrum murder'))
print(isPalindrome3('redrum murder'))