Variable shared between classes

class1.py

def f1():
    print("1 Class1.last_object", Class1.last_object)
    Class1.last_object = "Class1 set last_object"
    print("2 Class1.last_object", Class1.last_object)

class Class1():
    last_object = "base1"

    def get(self):
        return Class1.last_object

    def f(self):
        return f1()

class2.py

def f2():
    print("1 Class2.last_object", Class2.last_object)
    Class2.last_object = "Class2 set last_object"
    print("2 Class2.last_object", Class2.last_object)

class Class2():
    last_object = "base1"

    def get(self):
        return Class2.last_object

    def f(self):
        return f2()

output.txt

1 Class1.last_object base1
2 Class1.last_object Class1 set last_object
Result: Class1 set last_object
1 Class2.last_object base1
2 Class2.last_object Class2 set last_object
Result: Class2 set last_object
Final result: Class2 set last_object

run.py

from class1 import Class1
from class2 import Class2

last_object = "base1"

sm = Class1()
sm.f()
print("Result:", sm.get())
last_object = sm.get()

sm = Class2()
sm.f()
sm.get()
print("Result:", sm.get())
last_object = sm.get()

print("Final result:", last_object)