function wrappers

import functools

def deprecated(message="This method is deprecated."):
    def decorator(func):
        @functools.wraps(func)
        def wrapper(self, *args, **kwargs):
            print(f"Deprecation warning: {message}")
            return func(self, *args, **kwargs)
        return wrapper
    return decorator

class MyClass:
    @deprecated()
    def old_method(self):
        print("Using old method")

    def new_method(self):
        print("Using new method")

obj = MyClass()
obj.old_method()  # Outputs: Deprecation warning: This method is deprecated.
obj.new_method()