A simple example of Python string case conversion

The following editor will bring you a simple example of Python string case conversion. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor and take a look

①All letters are converted to uppercase

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

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

HELLO, WORLD!

②All letters are converted to lowercase

-*- coding:utf-8 -*-

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

hello, world!

③Convert the first letter to uppercase and the rest to lowercase

-*- coding:utf-8 -*-

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

Hello, world!

④Convert the first letter of all words to uppercase and the rest to lowercase

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

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

Hello, World!

⑤ Judge that all letters are uppercase

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

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

b = 'hello, world!'
print(b.isupper( )) Output:

True
False

⑥Judge that all letters are lowercase

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

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

b = 'hello, world!'
print(b.islower()) output:

False
True

⑦ Determine whether the first letter of all words is capitalized

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

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

b = 'hello, world!'
print(b.istitle())

c = 'Hello, World!'
print(c.istitle()) output:

False
False
True

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