Inheritance: how to call method of parent class?

Question

I made following 3 classes. India is parent class of States and States is parent class of District. I define 1 object of District class. When I try to run method of India class it gives an error. Please help me how to run it.

class India:
    def __init__(self):
        print("Country is India")
    def functionofindia(number):
        rvalue=number*2
        return rvalue   

    
class States(India):
    def __init__(self,nameofstate):
        super().__init__()
        print("state is {}".format(nameofstate))


class District(States):
    def __init__(self,nameofstate, nameofdistrict):
        super().__init__(nameofstate)
        print("District is {}".format(nameofdistrict))


HP=District("Himachal Pradesh","Mandi")
print(HP.functionofindia(2))

The Error is:

Country is India
state is Himachal Pradesh
District is Mandi
Traceback (most recent call last):
  File "c:\Users\DELL\OneDrive\Desktop\practice\oops.py", line 23, in <module>
    print(HP.functionofindia(2))
TypeError: functionofindia() takes 1 positional argument but 2 were given

Having `States` extend `India` is backwards. You're creating something generic from a brand. You should be creating a brand from something generic. — OneMadGypsy, Sep 20 '21 at 11:39

Jan Willem · Accepted Answer · 2021-09-20T11:39:19.583

To use a class method like this you should pass self as the first argument in the method definition. So your class India becomes:

class India:
    def __init__(self):
        print("Country is India")
    def functionofindia(self, number):
        rvalue=number*2
        return rvalue

When the method is not relevant to any attribute of the class, you could also replace it with a static method. See more about static methods here. India with a static method:

class India:
    def __init__(self):
        print("Country is India")

    @staticmethod
    def functionofindia(number):
        rvalue=number*2
        return rvalue

Inheritance: how to call method of parent class?

1 Answers1