In [1]:

    

class A:
    def f(self):
        return self.g()

    def g(self):
        return 'A'

class B(A):
    def g(self):
        return 'B'

a = A()
b = B()
print (a.f(), b.f())
print (a.g(), b.g())


    

    




('A', 'B')
('A', 'B')

In [2]:

    

class Circle(object):
    color = "red"

class NewCircle(Circle):
    color = "blue"
    
nc = NewCircle
print(nc)


    

    




<class '__main__.NewCircle'>

In [3]:

    

print(nc.color)


    

    




blue

In [4]:

    

class Person:
    def __init__(self, id):
        self.id = id
 
sam = Person(100)
 
sam.__dict__['age'] = 49
print (sam.age + len(sam.__dict__))


    

    




51

In [2]:

    

class A:
    def __init__(self):
        self.calc_i(30)
        print("i from A is", self.i)
 
    def calc_i(self, i):
        self.i = 2 * i;
 
class B(A):
    def __init__(self):
        super().__init__()
        
    def calc_i(self, i):
        self.i = 3 * i;
 
b = B()


    

    




i from A is 90

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