使用python实现回文数的四种方法小结

回文数就是指整数倒过来和原整数相等。

Example 1: Input: 121Output: true

Example 2: Input: -121Output: falseExplanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Example 3: Input: 10Output: falseExplanation: Reads 01 from right to left. Therefore it is not a palindrome.

1：整数转字符串，通过下标对比确定该整数是否为回文数

str_x = str(x)for i in range(0,int(len(str_x)/2)):  if str_x[i] != str_x[-i-1]:    return Falsereturn True

2：字符串切片操作，str[index:index:step]，中括号里面分别为：字符起点、终点和步长

str_x = str(x)return str_x == str_x[::-1]

3：数学计算的方法，对比反转整数的值

if x<0:  return Falsetemp_x = x;palindromeNum = 0while temp_x != 0:  palindromeNum = palindromeNum*10 + temp_x%10  temp_x /= 10return palindromeNum == x

4：整数转字符串，反转字符串，对比反转后字符串与原字符串是否相等

str_x = str(x)str_y = ""for i in str_x:  str_y = i + str_yreturn str_y == str_x

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