from functools import singledispatchmethod


class DemoClass:
    @singledispatchmethod
    def generic_method(self, arg):
        print(f"Do something with argument of type: {type(arg).__name__}")

    @generic_method.register
    def _(self, arg: int):
        print("Implementation for an int argument...")

    @generic_method.register(str)
    def _(self, arg):
        print("Implementation for a str argument...")


demo = DemoClass()

demo.generic_method(42)

demo.generic_method("Hello, World!")

demo.generic_method([1, 2, 3])