如何使用Verify()方法仅验证某些属性？

class User:
    def __init__(self, username, email, password):
        self.username = username
        self.email = email
        self.password = password

    def verify(self, rules):
        for attr, rule in rules.items():
            if hasattr(self, attr):
                value = getattr(self, attr)
                if not rule(value):
                    return False
        return True

# 创建用户对象
user = User("John", "john@example.com", "password123")

# 定义验证规则
rules = {
    "username": lambda x: len(x) >= 5,  # 用户名长度至少为5
    "email": lambda x: "@" in x,  # 邮箱地址必须包含@
}

# 调用Verify()方法进行验证
result = user.verify(rules)

if result:
    print("验证通过")
else:
    print("验证失败")