Python notes (9): String operations, python notes

Python notes (9): String operations, python notes

(1)String

Single quotation marks, double quotation marks, and triple quotation marks can all be used as the start and end of a string, and double quotation marks can be used to directly input multiple lines of strings. The triple quotation marks are generally used to write comments for multiple rows.

 

(2)RAnd \

RConverts a string to the original string, ignoring all escape characters.

\Is an escape character.

(3)String subscript and slice

 

(4)String in and not in

 

(5)Change case sensitivity

 

Method	Description
Upper ()	Convert all letters to uppercase (a new string is returned, and the original string will not be changed)
Lower ()	Convert all letters to lowercase letters (a new string is returned, and the original string will not be changed)

 

(6)IsxString Method

Method	Description
Isupper ()	Returns TRUE if all characters in the string are uppercase; otherwise, FALSE.
Islower ()	Returns TRUE if all characters in the string are in lowercase. Otherwise, FALSE is returned.
Isalpha ()	Returns true if the string contains only letters and is not empty; otherwise, returns false.
Isalnum ()	Returns true if the string contains only letters and numbers and is not empty; otherwise, returns false.
Isdecimal ()	Returns true if the string contains only numbers and is not null. Otherwise, returns false.
Isspace ()	If the string contains only spaces, tabs, and line breaks, and is not empty, true is returned. Otherwise, false is returned.
Istitle ()	Returns true if the string contains only the words starting with an uppercase character and followed by lowercase letters and is not empty. Otherwise, false is returned.

 

(7)Startswith ()And endswith ()

Method	Description
Startswith ()	Returns true if it starts with the specified string. Otherwise, returns false.
Endswith ()	Returns true if it ends with a specified string. Otherwise, false is returned.

 

(8)Join ()And split ()

Method	Description
Join ()	Concatenates strings in the list to form a separate string
Split ()	Returns a list of strings separated by spaces by default. You can also specify parameters. For example, in ps. split (':', 1), the first parameter is separated by:, and the second parameter is the maximum number of splits. By default, the parameter is split as much as possible.

 

(9)Strip (), Lstrip (), rstrip ()

Method	Description
Strip ()	Removes spaces, tabs, and line breaks from the left and right sides)
Lstrip ()	Delete blank characters (spaces, tabs, and line breaks) on the left)
Rstrip ()	Delete blank characters (spaces, tabs, and line breaks) on the Right)

 

(10)PyperclipModule

Pip install pyperclip

1 import pyperclip2 3 # copy data to clipboard 4 pyperclip. copy ('Hello word') 5 # paste clipboard content 6 print (pyperclip. paste ())