how would i add a while loop and counter to this code which an admin can use to login

Question

def login():
    logindetails = {'username':'Admin123' , 'password':'Pass123'}

    username = input("please enter the username")
    password = input("please enter the password")

    if username == 'Admin123':
        print ("username correct")
    else:
        print ("username incorrect")
    if password == 'Pass123':
        print ("password correct")
    else:
        print ("password incorrect")

login()

Please tell me where I would put the while loop and how would I format the code to add a counter too.

Answer 1

First, you should initialize username and password variables to empty strings as well as your counter.

Then, you should declare your while loop with for condition, the comparison between

• username and logindetails['username']
• password and logindetails['password'].

If both are the same, you're getting outside the loop, if not, you have to ask again for user inputs and increment the counter.

In other words :

username = ""
password = ""
counter = 0

WHILE username != logindetails['username'] AND password != logindetails['password']:
    ASK for user inputs / DISPLAY error messages
    INCREMENT counter

DISPLAY "logged after counter attempts"

Does it answer your questions ?

Answer 2

You can do something like this:

def login():
    logindetails = {'username':'Admin123' , 'password':'Pass123'}

    username = input("please enter the username")
    password = input("please enter the password")
    valid = False
    while valid == False:
        if username == 'Admin123' and password == 'Pass123':
            print ("username and password correct")
            valid = True
            pass
        else:
            print ("username or password incorrect")
        username = input("please enter the username")
        password = input("please enter the password")

valid is a bool so the loop wont stop until the username and password is correct.

Or you can have a fail safe where if the user enters the username and password wrong more than say 4 times, it kicks them out.

def login():
    logindetails = {'username':'Admin123' , 'password':'Pass123'}

    username = input("please enter the username")
    password = input("please enter the password")
    valid = False
    count = 0
    while count != 4 or valid == False:
        if username == 'Admin123' and password == 'Pass123':
            print ("username and password correct")
            valid == True
            pass
        else:
            print ("username or password incorrect")
            count += 1
        username = input("please enter the username")
        password = input("please enter the password")
    if valid == False:
        print ("Sorry you had too many attempts to login. Try again later")