类的特殊成员2

class A:
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def __add__(self, other):
        return  self.name,other.age

obj1 = A("alex",11)

obj2 = A("micd",12)

r = obj1 + obj2    #两个对象相加是
print(r)


class B:
    def __init__(self,name,age):   #查看有哪些对象，以及以字典的形式输出
        self.name = name
        self.age = age
        self.jimao = 121

obj = B("alex",12)
print(obj.__dict__)



class C:
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def __getitem__(self, item):
        return item+1

    def __setitem__(self, key, value):
        print(key,value)

    def __delitem__(self, key):
        print(key)


obj = C("alex",12)
print(obj.name)
print(obj.age)
#对象通过索引取值
w = obj[8]   #会执行__getitem__方法，8当参数传递给item
print(w)

obj[2]=7     #会执行__setitem__方法，2传递给key，7传递给value

del obj[6]   #会执行delitem方法