①所有字母都轉換為大寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'hello, world!'
??? print(a.upper())輸出：

HELLO, WORLD!

②所有字母都轉換為小寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.lower())輸出：

hello, world!

③首字母轉換成大寫， 其余轉換成小寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.capitalize())輸出：

Hello, world!

④所有單詞的首字母轉換成大寫， 其余轉換成小寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.title())輸出：

Hello, World!

⑤判斷所有字母都為大寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.isupper())
???
??? b = 'hello, world!'
??? print(b.isupper())輸出：

True
False

⑥判斷所有字母都為小寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.islower())
???
??? b = 'hello, world!'
??? print(b.islower())輸出：

False
True

⑦判斷所有單詞的首字母為大寫

# -*- coding:utf-8 -*-

if __name__ == "__main__":
??? a = 'HELLO, WORLD!'
??? print(a.istitle())
???
??? b = 'hello, world!'
??? print(b.istitle())
???
??? c = 'Hello, World!'
??? print(c.istitle())輸出：

False
False
True

以上這篇Python 字符串大小寫轉換的簡單實例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。