520. Detect Capital

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

 

Constraints:

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

---

#https://leetcode.com/problems/detect-capital/description/

'''
1. 아이디어 :
    대문자로 변환한 문자열과 비교하면 된다.
2. 시간복잡도 :
    O(1)
3. 자료구조 :
    문자열
'''


class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        s1=word.upper()
        s2=word.lower()
        s3=word.capitalize()

        return word==s1 or word==s2 or word==s3