A palindrome is when a whole number is reversed to equal the original whole number.
Example 1: Input: 121 Output: true
Example 2: Input: -121 Output: false Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
Example 3: Input: 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
1: Integer to string, determine whether the integer is a palindrome by subscript comparison
str_x = str(x)
for i in range(0,int(len(str_x)/2)):
if str_x[i] != str_x[-i-1]:
return False
return True
2: String slicing operation, str[index:index:step], inside the parentheses are: character start point, end point and step size
str_x = str(x) return str_x == str_x[::-1]
3: Methods of mathematical computation, comparing and contrasting the values of inverted integers
if x<0: return False temp_x = x; palindromeNum = 0 while temp_x != 0: palindromeNum = palindromeNum*10 + temp_x%10 temp_x /= 10 return palindromeNum == x
4: integer to string, reverse the string, compare the reversed string with the original string is equal or not
str_x = str(x) str_y = "" for i in str_x: str_y = i + str_y return str_y == str_x
Above this summary of four ways to use python to realize the number of back text is all that I have shared with you.