Inheritance of class in Python?

Question

Suppose I have a parent class A and a daughter class B. Now A has 10 methods in it and B requires only three of those methods. How can this be done?

Can't B just ignore the other seven methods? Or could you refactor the shared methods into a superclass that both A and B share, making them siblings? If you want to override inherited methods in a class, just implement them within that class definition. — jonrsharpe
– jonrsharpe, Commented Jun 18, 2015 at 19:42
The Liskov substitution principle requires that a subtype B of A has at least the interface of A. If you don’t want that, then you probably don’t want B to be a subtype of A. — poke
– poke, Commented Jun 18, 2015 at 19:47
Make a parent class that has the 3 methods in it. Inherit the class A and class B from the parent. class A will keep its 7 methods and class B wont know anything about them. Similar to @jonrsharpe suggestion (I +1'd it) , but I advocate this approach to just "ignoring" the other seven methods, since if you are not the only developer then someday someone might forget why they are "ignoring" them. — Dan
– Dan, Commented Jun 18, 2015 at 22:33

Karpov · Accepted Answer · 2015-06-18 19:50:47Z

1

There is nothing special to do.

Just inherit class A:

class B(A):
    super(B, self).__init__():

Use/override the methods you need and ignore the rest.

answered Jun 18, 2015 at 19:50

Karpov

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