Process control

if else conditional statement

single branch

if condition:
    code to be executed when the condition is met

double branch

if condition:
    Execute code when conditions are met
else:
    If the condition is not met, go to this section

multi-branch

if condition:
    Execute code when conditions are met
elif condition:
    If the above conditions are not met, go for this
elif condition:
    If the above conditions are not met, go for this
elif condition:
    If the above conditions are not met, go for this    
else:
    If all the above conditions are not met, go to this section

while loop

while   condition:
    Execute code...

loop termination statement

break is used to completely end a loop and jump out of the loop body to execute the statements after the loop
continue is similar to break, the difference is that continue only terminates the current loop, and then executes the following loop, while break terminates the loop completely

while....else.....

　　When the while loop is executed normally and is not interrupted by break in the middle, the statement following the else will be executed.

flag bit

　　A control loop is achieved by modifying the flag bits

exit_flag = False

while not exit_flage：
    .......
    exit_flage = True