Accessing the same function from two different classes

I have two classes, suppose A and B. Within B, I instantiate A.

I have a function func() that is required by both the classes.

How should I go about it? I had thought of this approach:

class A:
   func()

class B:
   x = A()
   func()

def func():

And then I can access func(开发者_C百科) from within A or B. Is this approach OK or is there a better way to do this (perhaps using an OO approach)

Note that I am new to OO programming and that is why I am interested in knowing whether I can apply any OO design to this.

Edit: The function can differ in the arguments it takes.

Define func before you define either class, and it will be available to both.

func here can me a method of common base class

class Base(object):
    def func():
        #...
class A(Base):
    #...
class B(Base):
    #...