Need Help with making a account system for my bank program

I'm trying to create a simple banking system where I can create an account, login, deposit, and withdraw. I'm having a little problem with the account system. Imagine there are multiple users with the same username but different passwords. My code doesn't know how to differentiate them. I would like to have an account number for each account, so I can add the account number when logging in. What should I do ? Should I use a dictionary with account number as key and list of all the other data(username, password etc) as value? Here's the code below. ``` def show_welcome(): print("Welcome to Bank!") def create_account(): accounts = get_accounts() if "Error" in accounts: print("Please try it again.") return username = input("Please enter your username: ") password = input("Please enter your password: ") name = input("Please enter your name: ") surname = input("Please enter your surname: ") birth_date = input("Please enter your birth date: ") new_balance = 100 new_account_number = generate_account_number() new_account = generate_account(username, password, name, surname, birth_date, new_account_number, new_balance) accounts.append(new_account) write_accounts(accounts) def login(): accounts = get_accounts() if "Error" in accounts: print("Please try it again.") return username = input("Please enter your username: ") password = input("Please enter your password: ") for account in accounts: if account['username'] == username and account['password'] == password: print("Login Successful!") return account print("Invalid username or password...") return None def add_to_account_number(account_number, amount): accounts = get_accounts() if "Error" in accounts: print("Please try it again.") return for account in accounts: if account['account_number'] == account_number: new_balance = account['balance'] + amount return new_balance return None def subtract_from_account_number(account_number, amount): accounts = get_accounts() if "Error" in accounts: print("Please try it again.") return for account in accounts: if account['account_number'] == account_number: new_balance = account['balance'] - amount return new_balance return None def write_accounts(accounts): try: with open('accounts.txt', 'w') as f: for i in accounts: for k, v in i.items(): f.write(f"{k}:{v}\n") f.write("\n") except: print("An error occurred!") def get_accounts(): try: with open('accounts.txt', 'r') as f: read_lines = [line.strip() for line in f.readlines() if line.strip()] accounts = [] account = {} for line in read_lines: if ":" in line: k, v = line.split(":") account[k] = v else: accounts.append(account) account = {} accounts.append(account) return accounts except: return None def generate_account(username, password, name, surname, birth_date, account_number, balance): account = { "username": username, "password": password, "name": name, "surname": surname, "birth_date": birth_date, "account_number": account_number, "balance": balance } return account def generate_account_number(): accounts = get_accounts() if "Error" in accounts: print("Please try it again.") return return len(accounts) + 1 ``` TLDR: I'm trying to create a simple banking system where I can create an account, login, deposit, and withdraw. I'm having a little problem with the account system. Imagine there are multiple users with the same username but different passwords. My code doesn't know how to differentiate them. I would like to have an account number for each account, so I can add the account number when logging in. What should I do ? Should I use a dictionary with account number as key and list of all the other data(username, password etc) as value?

Need Help with making a account system for my bank program

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