Example of class delegation

class_delegation.py

# Source: https://stackoverflow.com/a/26467767

class Parent(object):
    def __init__(self, name, number):
       self.name = name
       self.number = number
       
    def scream(self):
        print('pparent')
        
class Child(object):
    def __init__(self, parent, other):
        self.parent = parent
        self.other = other
        self.name

    def scream(self):
        print('child')

    def __getattr__(self, name):
        try:
            return getattr(self.parent, name)
        except AttributeError as e:
            raise AttributeError("Child' object has no attribute '%s'" % name)

p = Parent("Foo", 42)
c = Child(p, "parrot")
print(c.name, c.number, c.other)
p.name = "Bar"
c.scream()
print(c.name, c.number, c.other )