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Python 属性类型完整介绍

  • 2026-08-19 06:27:03
Python 属性类型完整介绍

Python 中对象的属性分为实例属性、类属性、私有属性、特殊属性、装饰器属性 (property) 五大类,同时区分实例访问、类访问、继承行为,下面逐一拆解。

一、类属性(Class Attribute)

定义在 class 内部、方法外部,属于类本身,所有实例共享同一份数据。

特点

  1. 类、实例都能读取;
  2. 实例直接赋值会生成同名实例属性,屏蔽类属性;
  3. 修改类属性会同步所有未覆盖该属性的实例。

classPerson:
    species ="人类"# 类属性

p1 = Person()
p2 = Person()

print(Person.species)# 类直接访问:人类
print(p1.species)# 实例访问:人类

# 类修改,全部实例同步变化
Person.species ="智人"
print(p2.species)# 智人

# 实例赋值,创建独立实例属性,不再共用
p1.species ="男人"
print(p1.species)# 男人(实例属性)
print(Person.species)# 智人(类属性不变)

二、实例属性(Instance Attribute)

绑定在单个对象上,仅当前实例独有,定义两种方式:

  1. __init__
     构造函数内 self.xxx(推荐)
  2. 实例对象动态赋值 obj.xxx = 值

classPerson:
def__init__(self, name):
        self.name = name  # 实例属性

= Person("张三")
p.age =20# 动态新增实例属性
print(p.name, p.age)
# print(Person.name) 报错:类没有实例属性

三、私有属性(约定式私有,无真严格私有)

Python 没有语法级私有,靠命名规范区分访问权限:

1. _xxx 单下划线:保护属性(protected)

约定:仅类内部、子类使用,外部不建议直接访问,语法上仍可读取。

classPerson:
def__init__(self):
        self._id =1001# 保护属性

= Person()
print(p._id)# 能访问,但不推荐

2. __xxx 双下划线:名称改写(name mangling)

底层自动改名 _类名__属性外部无法直接通过 obj.__xxx 访问,模拟私有。

classPerson:
def__init__(self):
        self.__password ="123456"

= Person()
# print(p.__password)  # AttributeError 报错
print(p._Person__password)# 强制绕过,不建议使用

3. xxx_ 尾下划线

仅用来规避和 Python 关键字重名,无私有含义:

cls_ ="学生"# class是关键字,加下划线区分

四、property 装饰器:可控属性(读写校验属性)

普通属性无法限制赋值,@property 将方法伪装成属性,支持读、改、删,适合数据校验。

1. 只读属性(仅 getter)

classPerson:
def__init__(self, age):
        self._age = age

@property
defage(self):
# 获取时自动执行逻辑
return self._age

= Person(18)
print(p.age)# 像属性一样调用,不加()
# p.age = 20 报错,无setter不能修改

2. 可读可写(getter + setter)

classPerson:
def__init__(self, age):
        self._age = age

@property
defage(self):
return self._age

@age.setter
defage(self, val):
# 赋值校验
ifnotisinstance(val,int):
raise ValueError("年龄必须整数")
if0< val <150:
            self._age = val
else:
raise ValueError("年龄超出范围")

= Person(18)
p.age =25
print(p.age)
# p.age = 200 抛异常

3. 删除属性 deleter

@age.deleter
defage(self):
del self._age

del p.age

五、特殊内置属性(魔术属性)

每个类 / 实例自带系统内置属性,前后双下划线 __xxx__

  1. __dict__:字典,存储当前对象所有自定义属性
  2. = Person(18)
    print(p.__dict__)# {'_age': 18}
    print(Person.__dict__)# 类属性、方法

  3. __class__:返回实例所属类

print(p.__class__)# <class '__main__.Person'>

  1. __name__
    :类 / 函数名称(仅类 / 函数可用,实例无)
  2. __bases__
    :类的父类元组
  3. __doc__
    :类文档字符串

六、补充:动态属性相关工具

1. __slots__ 限制允许的实例属性

默认实例用 __dict__ 存属性,内存开销大;__slots__ 固定属性列表,禁止动态新增属性,节省内存。

classPerson:
    __slots__ =["name","age"]# 仅允许这两个实例属性
def__init__(self, n, a):
        self.name = n
        self.age = a

= Person("李四",22)
# p.gender = "男" 报错,不允许新增属性

2. getattr / setattr / delattr 动态操作属性

= Person("王五",20)
print(getattr(p,"name"))# 获取属性
setattr(p,"age",21)# 修改属性
delattr(p,"age")# 删除属性

七、各类属性对比总结

属性类型
归属对象
外部可直接访问
核心用途
类属性
class
全局共享常量、计数
实例属性
object
每个对象独立数据
_xxx 保护属性
实例 / 类
是(不推荐)
子类复用,外部禁止修改
__xxx 私有属性
实例
不能直接访问
封装敏感数据,防误改
@property 属性
实例
友好读写
赋值校验、计算型只读属性
slots
 属性
实例
受限
压缩内存,禁止动态新增属性

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  1. CONNECT:[ UseTime:0.001068s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001435s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001428s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001879s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001396s ]
  6. SELECT * FROM `set` [ RunTime:0.004695s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001509s ]
  8. SELECT * FROM `article` WHERE `id` = 504719 LIMIT 1 [ RunTime:0.010324s ]
  9. UPDATE `article` SET `lasttime` = 1787305742 WHERE `id` = 504719 [ RunTime:0.055070s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.025995s ]
  11. SELECT * FROM `article` WHERE `id` < 504719 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001363s ]
  12. SELECT * FROM `article` WHERE `id` > 504719 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001009s ]
  13. SELECT * FROM `article` WHERE `id` < 504719 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002812s ]
  14. SELECT * FROM `article` WHERE `id` < 504719 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001952s ]
  15. SELECT * FROM `article` WHERE `id` < 504719 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002293s ]
0.279371s