[leetcode: Python]520. Detect Capital

Given a word, you need to judge whether the usage of capitals in it is right or not.

We define the usage of capitals in a word to be right when one of the following cases holds:

All letters in this word are capitals, like “USA”.
All letters in this word are not capitals, like “leetcode”.
Only the first letter in this word is capital if it has more than one letter, like “Google”.
Otherwise, we define that this word doesn’t use capitals in a right way.
Example 1:

Input: "USA"Output: True

Example 2:

Input: "FlaG"Output: False

Note: The input will be a non-empty word consisting of uppercase and lowercase latin letters.

方法一：52ms

class Solution(object):    def detectCapitalUse(self, word):        """        :type word: str        :rtype: bool        """        if word.isupper():            return True        elif word.islower():            return True        elif 65 <= ord(word[0]) <= 90:            if word[1:].islower():                return True        return False

方法二：42ms

class Solution(object):    def detectCapitalUse(self, word):        """        :type word: str        :rtype: bool        """        import re        pat = '([A-Z]*|[A-Z][a-z]*|[a-z]*)$'        return True if re.compile(pat).match(word) else False

方法三：38ms

class Solution(object):    def detectCapitalUse(self, word):        """        :type word: str        :rtype: bool        """        return  word.isupper() or word.istitle() or word.islower()