Getting started with Python-recognize while loops and use

The content of this section

1. Recognize while loop
2. The use of the while loop
3. Nested loop: Loop sleeve loop

1. Recognize while loop

Break # terminates the current loop

Continue #跳出当次循环

1  While judging condition:   # when the while satisfies the condition, the program will always loop 2     execution Statement ... 3 else:   # when the normal loop completes, the program does the else note: break terminates the while loop, so the program does not do else , and continue is skipping cycles, so the program will execute the else4     Execution statement ...

2. The use of the while loop

The user enters a value to guess the correct age

1Age = 602  whileTrue:3guess_age = Int (input ("Age:"))4     ifGuess_age = =Age :5         Print("Congratulations to you! Guess right! ")6          Break7     elifGuess_age >Age :8         Print("guess it's big! ")9     Else:Ten         Print("guess it's small! ") One Else: A     Print("End")

3. Nested loop: Loop sleeve loop

(1) using the # number to output a rectangle, the user can specify width and height. Columns such as: Length 3, height is 4, output a horizontal with 3 # number, vertical with 4 # Number of rectangles

1height = Int (input ("Height:"))2width = Int (input ("Width:"))3NUM1 = 14  whileNUM1 <=Height:5num2 = 16      whileNum2 <=Width:7         Print("#", end="")8Num2 + = 19NUM1 + = 1Ten     Print() One Else: A     Print("End")

(2) Input "99 multiplication table" with while loop

1NUM1 = 12  whileNUM1 <= 9:3num2 = 14      whileNum2 <=NUM1:5NUM3 = num2 *NUM16         Print(NUM1,"*", Num2,"=", num3, end="   ")7Num2 + = 18     Print()9NUM1 + = 1Ten Else: One     Print("99 multiplication Table")

Getting started with Python-recognize while loops and use