python basics 6 - while loop with escape characters

8. Basic use of while loop

8.1 Basic syntax of while statement

Initial condition setup - usually a counter that repeats itself

 

while condition (judging whether the counter reaches the target number of times):

    When conditions are met, do something 1

    When the condition is met, do something 2

    When the conditions are met, do something 3

    ...(omit)...

    processing condition (counter + 1)

Note :

The while statement and the indented part are a complete block of code

8.2 break 和 continue

break and continue are keywords used exclusively in loops

When a certain condition of break is satisfied , exit the loop and no longer execute subsequent repeated code
Continue When a certain condition is met , the subsequent repeated code will not be executed, and the loop will be executed.

break and continue are only valid for the current loop

break

-During the loop , if you no longer want the loop to continue executing after a certain condition is met , you can use break to exit the loop

continue
During the loop , if you don't want to execute the loop code after a certain condition is met , but you don't want to exit the loop , you can use continue
That is: in the entire loop, there are only certain conditions , the loop code does not need to be executed, and other conditions need to be executed
Note: When using continue, the code in the conditional processing part needs special attention , and an infinite

continue is only valid for the current loop

8.3 Nested while loops

while nesting is: while there is a while inside

while condition 1 :
    When conditions are met, do something 1
    When the condition is met, do something 2
    When the conditions are met, do something 3
    ...(omit)...
    
    while condition 2 :
        When conditions are met, do something 1
        When the condition is met, do something 2
        When the conditions are met, do something 3
        ...(omit)...
    
        Processing condition 2
    
    Processing condition 1

9. Escape characters in strings

\t prints a tab to help keep the vertical alignment of the output text
\n prints a newline

The function of the tab character is to vertically align text by column without using a table

escape character	describe
\	backslash symbol
\'	apostrophe
\"	Double quotes
\n	newline
\t	horizontal tab
\r	Enter