Python--while, break, continue, else

1.while Loop statement:

1  Count = 02 while Count <=:3      print("   ", Count)4      count + = 15print('-- --loop is ended----')

2. Print even numbers:

1 #Print even numbers2 #count = 03 #4 #While count <=:5 #6 #if count% 2 = = 0: #偶数7 #Print ("loop", count)8 #9 #count + = 1Ten # One # A #print ('----loop is ended----')

3.50th time do not print, 第60-80 print the corresponding value of the square

1Count =02 3  whileCount <= 100:4 5     ifCount = = 50:6         Pass #just before. 7 8     elifCount >= 60 andCount <= 80:9         Print(count*count)Ten  One     Else: A         Print('Loop', count)
    
Count+=1

4. Dead Loop

1 count = 023 while True:4     print(" ", count)5count + = 1      

5. Loop Termination statement: Break&continue

Break: Used to completely end a loop, jump out of the loop body and execute the statement following the loop

Continue: Does not jump out of the loop, terminates the loop, then executes the next loop, break terminates the entire loop

1 #Break Loop2 #count=03 #While count<=100:4 #print (' Loop ', count)5 #if count==5:6 # Break7 #count+=18 #print ('-----out of a while loop---')

1 #Continue cycle2Count=03  whilecount<=100:4     Print('Loop', Count)5     ifCount==5:6         Continue7Count+=18 #print ('-----out of a while loop---') #一直打印59 #continue jumps out of this loop, does not execute Count+=1,count has been 5

Example 1: Let the user guess the age

1Age = 262user_guess = Int (input ("your guess:"))3 ifUser_guess = =Age :4     Print("Congratulations on your right answer, you can hold the silly girl home! ")5 elifUser_guess <Age :6     Print("try bigger")7 Else :8     Print("try smaller")

Example 2: Users guess the age upgrade version, let the user guess age, up to guess 3 times, the middle guess on the exit loop

1Count =02Age = 263 4  whileCount < 3:5 6user_guess = Int (input ("your guess:"))7     ifUser_guess = =Age :8         Print("Congratulations on your right answer, you can hold the silly girl home! ")9          BreakTen     elifUser_guess <Age : One         Print("try bigger") A     Else : -         Print("try smaller") -  theCount + = 1

Example 3: The user guess age continues to upgrade, let the user guess age, guess 3 times, if the user 3 times are wrong, ask the user whether still want to play, if y, then continue to guess 3 times, to this reciprocating "note hint: equivalent in count=3 when asked the user, if still want to play, equal to count to 0 and then run again"

Count =0age= 26 whileCount < 3: User_guess= Int (Input ("your guess:"))    ifUser_guess = =Age :Print("Congratulations on your right answer, you can hold the silly girl home! ")         Break    elifUser_guess <Age :Print("try bigger")    Else :        Print("try smaller") Count+ = 1ifCount = = 3: Choice= Input ("you idiot, don't guess right, still want to continue? (y| Y)")        ifChoice = ='y' orChoice = ='Y': Count= 0

The role of the else behind the 6.while&else:while is that when the while loop executes normally and the middle is not interrupted by a break, the Else statement "else detects if your loop process has been aborted (when your loop code is longer)"

 1  count=0  2  #   while Count <=5:  3  #   count+=1  4  #   print (' Loop ', count)  5  #< /span>6  #   else:  7  #   print (' Loop normal execution ')  8  #   print (' -----out of a while loop----')  

1Count=02  whileCount<=5:3     Print('Loop', Count)4     ifCount==3:5          Break6Count+=17 Else:8     Print('Loop is done')

Python--while, break, continue, else