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: 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：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 False
return 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 False
temp_x = x;
palindromeNum = 0
while temp_x != 0:
  palindromeNum = palindromeNum*10 + temp_x%10
  temp_x /= 10
return 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_y
return str_y == str_x

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