多账号管理新年优惠活动

import json

class AccountManager:
    def __init__(self, filename):
        self.filename = filename
        self.accounts = self.load_accounts()

    def load_accounts(self):
        try:
            with open(self.filename, 'r') as file:
                return json.load(file)
        except FileNotFoundError:
            return {}

    def save_accounts(self):
        with open(self.filename, 'w') as file:
            json.dump(self.accounts, file, indent=4)

    def add_account(self, username, password):
        self.accounts[username] = password
        self.save_accounts()

    def get_password(self, username):
        return self.accounts.get(username, None)

# 使用示例
manager = AccountManager('accounts.json')
manager.add_account('user1', 'password1')
manager.add_account('user2', 'password2')

print(manager.get_password('user1'))  # 输出: password1