[Python] Refactoring a stateful Python class best practice

I have a fairly large python class that follows this structure:

class A:
def __init__(self):
self.a = 0
self.b = 0

def foo(self):
self.a = 1

def bar(self):
self.b = 2


I want to refactor the methods in this class into different files. What is the best way to refactor the method foo into another file? Is this a common practice?

class Foo:
def __init__(self, owner):
self.owner = owner

def foo(self):
self.owner.a = 1

class A:
def __init__(self):
self.a = 0
self.b = 0
self.foo = Foo(self)

def bar(self):
self.b = 2

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