DAY1 practice

Requirements: The user is logged in (three chances to make mistakes) and each time the user makes a mistake, the remaining number of mistakes is displayed (hint: use string formatting),

If you use it three times, ask if you want to try again and give it three more chances. If you don't want to try it, say there is no chance.

list = [{'username':'xyn','password':'789'}, 
         {'username': 'xxx', 'password': '123'}, 
         {'username': 'yyy', 'password ': '456'},] 
count=0 #Have been entered several times 
b=6 #Total input times 
a=3 #Reminder the remaining times 
while count<3: 
            username = input("Please enter username:") 
            password = input( "Please enter password:") 
            for i in list: 
                if username==i['username'] and password==i['password']: 
                       print("Login is successful") 
                       count=3 #To jump out of the while loop 
                       break # Jump out of the for loop 
            else:
                b=b-1 
                a=a-1 
                print('Login failed, re-enter, remaining %s chances'%a )
                count += 1 
                if b==0: 
                    print('No chance!') 
                    break 
                if count==3: 
                   choice=input('Whether to try 3 more times, yes or no:') 
                   a=3 
                   if choice== 'yes' : 
                          count=0 
                   else: 
                          print('Goodbye!') 
                          break 

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