python-Loop (while loop, for loop)

#循环, Traverse, iterate
# for Loop, while loop

See Data types
Type (name) int

Break no matter whether the loop is complete or not, end the loop immediately
Continue end this cycle and proceed to the next cycle

One, while loop

# while loop, must have a counter

# The loop is the code inside the repeating loop body

Count = 0

While count<10:

　　Print (' Hello ')

　　Count = count+1

eg

# Guess the number, if the big guess, the hint is too big, guess small, the hint is small, guessed right on the end
Import Random
num = Random.randint (1,100) # generates a random number
Count = 0
While count<7:
    Guess = input (' Please enter the number you guessed: ')
    guess = Int (guess)
    If Guess>num:
        Print (' Guess big ')
        Continue
    Elif Guess<num:
        Print (' Guess small ')
        Continue
    Else
        Print (' Congratulations on your guess right ')
        Break  #立即结束循环
    Count = count+1
    # if count==7:
Else
    Print (' ran out of times ')

Second, for Loop

Import Random
num = Random.randint (1,100)

For I in range (3):
    Guess = input (' Please enter the number you guessed: ')
    guess = Int (guess)
    If guess > num:
        Print (' Guess big ')
        Continue
    Elif Guess < num:
        Print (' Guess small ')
        Continue
    Else
        Print (' Congratulations on your guess right ')
        Break  # immediate End loop
Else
    Print (' ran out of games ')

For loop class Practice-Login with the code as follows:

# Number of Errors 3 times
For I in range (3):
    Username = input (' Please enter your user name: ')
    PWD = input (' Please enter your password: ')
    If username = = ' Nhy ' and pwd = = ' 123456 ':
        Print (' Welcome, login Successful! ‘)
        Break
    Else
        Print (' Account/Password Error! ‘)
        Continue
Else
    Print (' The number of errors has been exhausted, please try again tomorrow! ‘)

python-Loop (while loop, for loop)