Polymorphism when calling a static method from a static method in python

Question

I am currently working on a problem where many classes will be based on a base class. I want these classes to inherit a static function from the base class which in turn calls a static function. This second static function will, however, be defined for each class.

A simple example would be:

class foo():
   @staticmethod
   def fn1(x):
      return x

   @staticmethod
   def fn2(x, y):
      return foo.fn1(x + y)

class bar(foo):
   @staticmethod
   def fn1(x):
      return 2*x

With the above code bar.fn2(1, 2) returns foo.fn1(1 + 2) and I would instead like it to return bar.fn1(1 + 2).

Is this possible to do with static methods in python without defining fn2 for each class?

Grateful for any help!

jwodder · Accepted Answer · 2019-06-02 22:49:56Z

2

Make fn2 a classmethod instead so that it has access to the class used to call the method:

@classmethod
def fn2(cls, x, y):
   return cls.fn1(x + y)

answered Jun 2, 2019 at 22:49

jwodder

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