users = [('jkinne','hello'),
         ('root','bob'),
         ('sternfl','1234')]
#user = users[0]
#print(user)
#username = user[0]
#print(username[0])

loginOk = False
while not loginOk:

    user = input('user: ')
    password = input('password: ')

    userAndPassword = (user, password)
    #print(userAndPassword)

    if userAndPassword in users:
        print('Okay, good.')
        loginOk = True
    else:
        print('Not correct login.')