Overriding class function with instance function in python

Question

Consider this example:

class master:
    @classmethod 
    def foo(cls):
        cls.bar()

class slaveClass( master ):
    @classmethod 
    def bar(cls):
        print("This is class method")

slaveType = slaveClass
slaveType.foo()

class slaveInstance( master ):
    #def foo(self):
    #    self.foo()
    def __init__(self,data):
        self.data=data
        print("Instance has been made")
    def bar(self):
        print("This is "+self.data+" method")


slaveType = slaveInstance("instance")
slaveType.foo()

I know it works when last definition of foo is uncommented, but is there any other way to use this foo function without changing the usage. I have large project where classes defined the way things worked and I was able to change the way with slaveType but there happen to be a case where instance is needed, and there is bit too many foo like functions to be overridden for instance behavior.

Thank you stackers!

Answer 1

Okey... I gave my best to preGoogle and figure out what to ask, but I failed. Now I know, that this was what I wanted to do: Creating a method that is simultaneously an instance and class method. There is also the solution I needed.

But it still seems not very beautiful. Maybe there is cleaner way or cleaner hack.

Answer 2

Look closer at the doc for classmethod. Instance methods pass an instance as the first argument, and class methods pass a class as the first argument. Calling slaveType.foo() passes an instance, slaveType, as the first argument of foo(). foo() is expecting a class as the first argument.