users.py

import pickle
import hashlib

class User:
    def __init__(self, username, pwhash):
        self.name = username
        self.pwhash = pwhash
        self.scores = []

def create_hash(username, password):
    hasher = hashlib.sha256()
    hasher.update(username.encode('utf-8'))
    hasher.update(password.encode('utf-8'))
    return hasher.digest()

def get_username_password():
    username = input("Enter username: ")
    password = input("Enter password: ")
    hashed_pw = create_hash(username, password)
    return username, hashed_pw

def create_user():
    username, hashed_pw = get_username_password()
    return User(username, hashed_pw)

def login_user(users):
    username, hashed_pw = get_username_password()
    if username not in users:
        print("User does not exist")
    elif hashed_pw != users[username].pwhash:
        print("Wrong password!")
    return users[username]

def get_score(user):
    score = int(input("Provide score"))
    user.scores.append(score)

if __name__ == "__main__":
    try:
        f = open("userdb", 'rb')
        users = pickle.load(f)
    except Exception as e:
        users = {}
    done = False
    user = None
    while not done:
        command = input("Input command (h for help): ")
        if command == 'c':
            user = create_user()
            users[user.name] = user
        elif command == 'l':
            user = login_user(users)
        elif command == 'v':
            print(user.name + " - " + str(user.scores))
        elif command == 's':
            get_score(user)
        elif command == '':
            done = True
        elif command == 'h':
            print("c - create user")
            print("l - login to existing user")
            print("v - view scores for current user")
            print("s - input score for current user")
            print("h - show this help")
            print("blank line to quit")
        with open("userdb", 'wb') as f:
            pickle.dump(users, f)
    f.close()