Python basis 2: flow control statements ------- condition selection

First, the input three random numbers, and determines a maximum value

Print ( " It is a maximum par applet parameter " )  number1 = INPUT ( ' Enter parameters. 1: ' ) number2 = INPUT ( ' enter the argument 2: ' ) number3 = INPUT ( ' enter 3 parameters: ' ) MAX_NUM = 0 IF number1> number2: MAX_NUM = number1 IF MAX_NUM> number3: Print ( ' maximum number is: ' + MAX_NUM) the else : Print ( ' maximum number is: ' + number3) the else : MAX_NUM = number2 IF MAX_NUM > number3: Print ( 'The maximum number is: '+ MAX_NUM) the else : Print ( ' maximum number is: '+ number3)

 

Second, a simulated account login, an error could not land three times and exit the program

1 = A
 # initialize password 
password = ' 123456 ' S = True # cycle begins the while S: mima = the INPUT ( " Please enter your password: " ) # password is correct, out of the loop IF password == mima: Print ( " the password is correct, welcome landing " ) S = False # 3 cycles, terminate the program elif A == 3 : Print ( " error number reaches three times, interrupted landing " ) bREAK # password is wrong, continue to cycle the else : Print ( " wrong password, please re-enter " ). 1 A + A = the else: Print ( " Welcome ")

 

 1 user = 'CatdeXin'
 2 passwd = 'abc123'  3  4 counter = 0  5 while counter < 3:  6 username = input('username: ')  7 password = input('password: ')  8  9 if username == user and password == passwd: 10 print("welcome %s login..."% user) 11 passwd_authentication = True 12 break 13 else: 14 print("Invalid username or password !") 15 16 counter += 1 17 if counter == 3: 18 keep_going_choice = str.title(input("Do you try to start again?【Y/N】")) 19 if keep_going_choice == 'Y': 20 counter = 0 21 22 else: print("Invalid username or password !")

 

Third, enter 99 multiplication table

x = 1

while y < 10:
    #print(str(x)+'*'+str(x)+'=',x*x)
    y = 1
    while y <= x: print(y,'*',x,'=',y*x,end="\t") y += 1 print() x+=1