Five methods for processing one character each time in Python, python5

Five methods for processing one character each time in Python, python5

Purpose

Each character of a string is processed. In fact, each character (Char) is a one-character string.

Method

1. Use the built-in function list ()

Copy codeThe Code is as follows:
>>> A_string = 'python'
>>> Char_list = list (A_string)
>>> Char_list
['P', 'y', 't', 'h', 'O', 'n']

2. Use the for statement to traverse strings

Copy codeThe Code is as follows:
>>> For c in A_string:
C. upper ()

'P'
'Y'
'T'
'H'
'O'
'N'

 

3. List Parsing

Copy codeThe Code is as follows:
>>> Char_list = [c. title () for c in A_string]
>>> Char_list
['P', 'y', 't', 'h', 'O', 'n']

 

4. map () function

Copy codeThe Code is as follows:
>>> Map (lambda c: c. lower (), A_string)
['P', 'y', 't', 'h', 'O', 'n']

 

5. Use set ()

Copy codeThe Code is as follows:
B _string = 'hello, world'
>>> Set (A_string). difference (set (B _string ))
Set (['y', 'h', 't', 'P', 'n'])