Week2CompletedExercise.py

# Assignment 2
# Before granting a user access to a system, they need to enter a valid username and password combination. This is a very basic form of authentication.
# Write a program which allows a user to input a username and password. Verify that the username exists and the password entered matches the one associated with the username.

# Acceptance Criteria
# 1. If the username and password combination is incorrect, print an error message
# 2. If the username and password combination is correct, print a success message
# 3. Allow the user to enter their password up to three times before quitting the program
# Extra Credit (if we were grading)
# 1. Allow the user to create an account if it does not already exist

users = [
  {'username': 'dz88',           'password': 'super-secret'}, 
  {'username': 'DogL0ver42',     'password': 'mydogsnameisfreckles'}, 
  {'username': 'punkrock3rgir1', 'password': 'joeyramone4lyfe'}]

not_logged_in=True
attempt_count=0
matched_user = False

while not_logged_in and attempt_count < 3:
  username = input('Enter your username: ')
  password = input('Enter your password: ')

  for user in users:
    if user["username"] == username:
      matched_user = True
      attempt_count = attempt_count + 1
      # Check if the password matches
      if user["password"] == password:
        not_logged_in = False
        print(f"{username} is logged in")
      else:
        print("bad password")
  
  if matched_user is False:    
    add_new_user = input(f"{username} is not a user. Do you want to add them? Y/n")
    if add_new_user == "Y":
      users.append({'username': username, 'password': password})
      print(f"Added {username} as a new user")
      not_logged_in = False