12. Circulation

While

# ask for 1-100 and A, sum = 1, 0 while a < 101:    = a + 1, sum + a    #
   
     sum = sum + a    
    # 
     a = a + 1
    print
    #
    5050,
   

While...else

 #  while Loop using the Else statement executes the ELSE statement when the conditional statement is False  Count = 0  while  count < 5:  print  (Count, " Span style= "COLOR: #800000" > less than 5   ", End="   )  #  0 is less than 5, 1 is less than 5, 2 is less than 5, 3 is less than 5, 4 is less than 5,  count + = 1else  :  print  (count, "   greater than or equal to 5   ") #  5 is greater than or equal to 5  

For in

 for  in range (1,3):    print(i,end=","#,

For in ... else

# the For loop uses the Else statement to execute the ELSE statement when the conditional statement is False  for  in range (1,3):    print(i,end=","#1, 2,  Else:    Print(i," greater than or equal to 3"# 3 is greater than or equal to 3

1. Range () traversal function
2. Break jumps out of the current loop
3, continue jump out of this cycle to continue the next cycle
4, pass empty statement, the general use of placeholder statements

12. Circulation