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反射

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# -*- coding:utf-8 -*-
# @Time       :2022/6/25 12:06
# @SOFTWARE   :python基础

# 反射
"""
    通过字符串操作类对象或者模块中的相关成员的操作
    hasattr() 检测对象/类是否有指定成员
    getattr() 获取对象/类成员的值
    setattr() 设置对象/类成员的值
    delattr() 删除对象/类成员的值
"""

class Father():
    pass

class Mother():
    pass

class Child(Father,Mother):
    eye = "黑色的"
    weight = "10斤"

    def eat(self):
        print("吃奶奶")

    def drink(self):
        print("喝啤酒")

    def __la(self):
        print("拉粑粑")



obj = Child()

# (1) hasattr() 检测对象 / 类是否有指定成员
res = hasattr(obj,"eye")
print(res)
res = hasattr(Child,"eye")
print(res)

# (2) getattr() 获取对象/类成员的值
res = getattr(obj,"weight")
# 如果获取的值不存在，可以设置第三个参数，防止报错
res = getattr(obj,"1","2")
print(res)


# 通过类进行反射 反射出来的是普通方法
res = getattr(Child,"drink")
print(res)
res(2)

# 通过对象进行反射 反射出来的是绑定方法  bound method Child.drink of <__main__.Child object at 0x00000231E35E2FD0>>
res = getattr(obj,"drink")
print(res)
res()


# (3) setattr() 设置对象/类成员的值

setattr(obj,"skin","black")
print(obj.skin)

setattr(Child,"skin","wheet")
print(Child.skin)




# (4) delattr() 删除对象 / 类成员的值

delattr(obj,"skin")
print(obj.skin)
delattr(Child,"skin")
print(obj.skin)