回文數(shù)就是指整數(shù)倒過(guò)來(lái)和原整數(shù)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：整數(shù)轉(zhuǎn)字符串，通過(guò)下標(biāo)對(duì)比確定該整數(shù)是否為回文數(shù)

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]，中括號(hào)里面分別為：字符起點(diǎn)、終點(diǎn)和步長(zhǎng)

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

3：數(shù)學(xué)計(jì)算的方法，對(duì)比反轉(zhuǎn)整數(shù)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：整數(shù)轉(zhuǎn)字符串，反轉(zhuǎn)字符串，對(duì)比反轉(zhuǎn)后字符串與原字符串是否相等

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

以上這篇使用python實(shí)現(xiàn)回文數(shù)的四種方法小結(jié)就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持武林網(wǎng)之家。