#improt time module for count down puase time
import time
#set var for loop counting
counter=1
#login setting
while counter<=3:
        
    print('please enter username: ')
    username=input()
    print('please enter password: ')
    password=input()
    #dict for username and password
    userinf={
        'xiaoweilai':'xiaoweilai',
        'python':'123',
        'education':'edu123'
    }
    #different entering cases
    if userinf.__contains__(username) and userinf.get(username)==password:
        print('welcome to python world')
        break
    else:
        print("username/password's error","please try again")
        counter=counter+1
        #error entering for 3 times and forcely stop 10senconds.
        if counter==3:
            print('You try it too much times.')
            counter = 0
            while counter <= 10:
                print(10 - counter)
                time.sleep(1)
                counter = counter + 1
            counter=0
        continue