①所有字母都转换为大写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'hello, world!' print(a.upper())输出：
HELLO, WORLD!
②所有字母都转换为小写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.lower())输出：
hello, world!
③首字母转换成大写， 其余转换成小写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.capitalize())输出：
Hello, world!
④所有单词的首字母转换成大写， 其余转换成小写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.title())输出：
Hello, World!
⑤判断所有字母都为大写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.isupper()) b = 'hello, world!' print(b.isupper())输出：
True False
⑥判断所有字母都为小写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.islower()) b = 'hello, world!' print(b.islower())输出：
False True
⑦判断所有单词的首字母为大写
# -*- coding:utf-8 -*-
if __name__ == "__main__": a = 'HELLO, WORLD!' print(a.istitle()) b = 'hello, world!' print(b.istitle()) c = 'Hello, World!' print(c.istitle())输出：
False False True
以上这篇Python 字符串大小写转换的简单实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。