46

 

1

class c:
    def __init__(self):
        self.x='X-man'
c1=c()
print(c1.x)
print(getattr(c1,'x','no'))
print(getattr(c1,'t','no'))

class D:
    def __getattribute__(self, name):
        print("getattribute")
    def __getattr__(self, name):
        print('getattr')
    def __setattr__(self, name, value):
        print('set')
        super().__setattr__(name,value)
    def __delattr__(self, name):
        print('del')
        super().__delattr__(name)

d=D()
print(d.x)
d.a=1
print(d.a)

class rectangle:
    def __init__(self,w=0,h=0):
        self.w=w
        self.h=h
    def __setattr__(self, key, value):
        if key=='square':
            self.w=value
            self.h=value
        else:
            #self.key=value    #err
            #super().__setattr__(key,value)  #right
            self.__dict__[key]=value
    def getarea(self):
        return self.w*self.h

r1=rectangle(4,5)
print(r1.getarea())

1