users.py

from typing import List
from datetime import datetime


# exception throw when username does not exist 
class InvalidUsername(Exception):
    pass 

# exception throw when password is invalid
class InvalidPassword(Exception):
    pass 

# exception throw when registering a user who already exist
class UserAlreadyExist(Exception):
    pass 


# exception thrown when registering a user with password missmatch i.e password 1 and 2 are not same 
class PasswordMissmatch(Exception):
    pass 


class InvalidDateOfBirth(Exception):
    pass 

def clear_users():
    """ only used when running tests"""
    pass

def login(username: str, password: str) -> dict:
    """ 
        Returns user details if user exist else returns None
    """
    pass

def register(username: str, password: str, password2: str, dateOfBirth: str):
    """
    if user exist return error saying user already exist

    if password1 and password2 are equal and username does not exist it will create
    a new user on our user dictionary and return user.

    if password1 and password2 is not equal raise an error.
    """
    pass

def list_users() -> List:
    pass 

if __name__ == '__main__':
    """ You can put your testing logic here """
    pass