Python方法和属性的动态绑定 --面向对象

需要了解的：

__ slots __：属于魔术变量，即：系统实现某些特定功能的变量

__ slots __：

1.限定类实例能添加的属性

2.对当前类起作用，对继承的子类是不起作用的

实操：

# coding:utf8
import traceback

from types import MethodType

class CustomClass(object):
    pass

# class CustomClass(object):
#     __slots__ = ['name', 'set_name']

def set_name(self, name):
    self.name = name

custom_class = CustomClass()
custom_class.name = "Thanlon"  # 动态添加属性
custom_class.set_name = MethodType(set_name, custom_class)  # 添加set_name方法作用在cusClass类中
custom_class.set_name("Tangtang")
print(custom_class.name)
try:
    custom_class.sex = '女'
    print(custom_class.sex)
except AttributeError:
    traceback.print_exc()

class ExtMyClass(CustomClass):
    pass

ext_class = ExtMyClass()
ext_class.sex = '男'
print(ext_class.sex)