125. Valid Palindrome

Title

给定一个字符串，验证它是否是回文串，只考虑字母和数字字符，可以忽略字母的大小写。

说明：本题中，我们将空字符串定义为有效的回文串。

示例 1:

输入: “A man, a plan, a canal: Panama”
输出: true

示例 2:

输入: “race a car”
输出: false

Code

 def isPalindrome(self, s: str) -> bool:import string# 1.去掉所有的空格s = s.replace(" ", "")# 2.去掉所有的标点符号s = "".join(c for c in s if c not in string.punctuation)# 3.把所有的单词变成小写s = s.lower()# 4.验证回文串return s == s[::-1]

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125. Valid Palindrome

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Code

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