企业官网建设流程全解析

构造函数

构造函数是类中在创建对象时自动调用的特殊方法，用于初始化对象的属性

class Person: def __new__(cls, *args, **kwargs): """用于创建实例并且返回实例""" instance = object.__new__(cls) return instance

析构函数

析构函数是对象被销毁时自动调用的特殊方法，用于清理资源

def __del__(self): """析构函数：对象销毁时自动调用""" print(f"{self} 被销毁了") # 清理资源

单例类

单例模式确保一个类只有一个实例，并提供全局访问点。

class BaseManage: instance = None def __new__(cls, *args, **kwargs): if cls.instance is None: obj = super().__new__(cls) cls.instance = obj return cls.instance class PersonManage(BaseManage): def __init__(self): self.person_list = [] pm1 = PersonManage() pm2 = PersonManage() print(pm1 is pm2)

attr 方法

attr方法的单例类

class PersonManage: def __new__(cls, *args, **kwargs): if not hasattr(cls, "instance"): obj = super().__new__(cls) setattr(cls, "instance", obj) return getattr(cls, "instance") pm1 = PersonManage() pm2 = PersonManage() print(pm1 is pm2)