Simple example of Python string case-sensitivity conversion

The following is a simple example of Python string case-sensitivity conversion. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at the following small series to bring you a simple example of Python string case-sensitivity conversion. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at it with Xiaobian.

① All letters are converted to uppercase letters.

#-*-Coding: UTF-8 -*-

If _ name _ = "_ main __":
A = 'Hello, world! '
Print (a. upper () output:

HELLO, WORLD!

② All letters are converted to lowercase letters

#-*-Coding: UTF-8 -*-

If _ name _ = "_ main __":
A = 'Hello, WORLD! '
Print (a. lower () output:

Hello, world!

③ The initial character is converted to uppercase and the remaining characters are converted to lowercase letters.

#-*-Coding: UTF-8 -*-

If _ name _ = "_ main __":
A = 'Hello, WORLD! '
Print (a. capitalize () output:

Hello, world!

④ The first letter of all words is converted into uppercase letters, and the other words are converted into lowercase letters.

#-*-Coding: UTF-8 -*-

If _ name _ = "_ main __":
A = 'Hello, WORLD! '
Print (a. title () output:

Hello, World!

⑤ Judge that all letters are in uppercase

#-*-Coding: UTF-8 -*-

If _ name _ = "_ main __":
A = 'Hello, WORLD! '
Print (a. isupper ())

B = 'Hello, world! '
Print (B. isupper () output:

True
False

6. 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 that the first letter of all words is uppercase.

#-*-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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