python面向对象--反射机制

class Black:
    feture="ugly"

    def __init__(self,name,addr):
        self.addr=addr
        self.name=name


    def sell_house(self):
        print("[%s] 正在卖房子"%self.name)


    def rent_house(self):
        print("[%s]正在租房子,傻逼才租呢?"%self.name)


b1=Black("dream","北京海淀")
print(hasattr(Black,"feture"))
#b1.name--->b1__dict__["name"]
# print(hasattr(b1,"name"))#b1.name
# print(hasattr(b1,"sell_house"))
#
#
# print(getattr(b1,"name"))
# print(getattr(b1,"sell_house"))
#
# func=getattr(b1,"rent_house")#没有报错
# func()
#
#
# print(getattr(b1,"rent_house11","没有这个属性"))



# b1.sb=True
# setattr(b1,"sb",True)
# setattr(b1,"name","alex")
setattr(b1,"func",lambda x:x+1)
setattr(b1,"func1",lambda self:self.name+"sb")
print(b1.__dict__)
print(b1.func)
print(b1.func(1))


print(b1.func1(b1))




# del b1.sb
# print(b1.__dict__)

# delattr(b1,"sb")
# print(b1.__dict__)

 
# class Foo:
#     x=1
#     def __init__(self,y):
#         self.y=y
#
#     def __getattr__(self, item):
#         print("执行__getattr__")
#
#     def __delattr__(self, item):
#         print("删除操作__delattr__")
#
#     def __setattr__(self, key, value):#设定属性
#         print("执行__setattr__")
#         # self.key=value
#         self.__dict__[key]=value


# f1=Foo(10)
#
# print(f1.y)
# print(getattr(f1,"y"))# len(str)--->str.__len__()
#
# f1.ss  #调用一个对象不存在的属性时触发__getattr__
#
#
# del f1.y#删除的时候触发__delattr__属性
# print(f1.x)
#
# f1.x=2#赋值的时候触发__setattr__
# print(f1.__dict__)


# print(dir(Foo))



class Foo:
    def __init__(self,name):
        self.name=name


    def __getattr__(self, item):
        print("你找的属性[%s]不存在"%item)


    def __setattr__(self, key, value):
        print("执行setattr",key,value)

        if type(value) is str:
            print('开始设置')
            # self.key=value#触发__setattr__
            self.__dict__[key]=value

        else:
            print("必须是字符串类型")


    def __delattr__(self, item):
        # print("执行delattr",item)
        print("不允许删除属性[%s]"%item)
        #del self.item
        # self.__dict__.pop(item)


f1=Foo("alex")
f1.age=18#触发__setattr__
#print(f1.__dict__)

# print(f1.name)
# print(f1.age)
# print(f1.gender)

print(f1.__dict__)
del f1.name
print(f1.__dict__)
# print(f1.__dict__)

来源：https://www.cnblogs.com/tangcode/p/11375965.html

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反射机制

python反射

python