LeetCode：(Python)(String) Detect Capital

題目連結: https://leetcode.com/problems/detect-capital/description/

題意說明: 如果字串全部大寫，字首大寫或全小寫，那麼就是 True，其他情況就是 False

初始想法

感覺可以分別用函式解決

全大寫: upper()

字首大寫: word.capitalize()

全小寫: lower()

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

表現還算不錯，但不穩定，有些 Test Case會很慘

參考他人作法

• 將三次判斷融合成一次判斷
• 將 capitalize()換成 title()

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        return word in [word.upper(), word.lower(), word.title()]

結果差不多但相對簡潔好讀，但 title()沒有什麼顯著影響。

2024–09–12

可以更簡化成 is判斷 function，isupper, islower, istitle

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        return word.isupper() or word.islower() or word.istitle()

計算大寫的字母數量

1. 沒有大寫
2. 全大寫
3. 1個大寫且是字首大寫

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        Capital_Count = 0

        for w in word:
            if w.isupper():
                Capital_Count = Capital_Count + 1

        return Capital_Count == 0 or Capital_Count == len(word) or (Capital_Count == 1 and word[0].isupper())