Leetcode - Detect Capital Solution

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, like "Google".

Given a string word, return true if the usage of capitals in it is right.

Example 1:

Input: word = "USA"
Output: true

Example 2:

Input: word = "FlaG"
Output: false


  • 1 <= word.length <= 100
  • word consists of lowercase and uppercase English letters.

Solution in Python

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        if word.lower() == word:
            return True
        elif word.upper() == word:
            return True
        elif word.capitalize() == word:
            return True
            return False

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