Python 字符串大小写转换的简单实例

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

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