<s>[INST] from __future__ import annotations

class MyClass:

    def __init__(self, func: callable) -> None:
        self.func = func

    def __call__(self, *args, **kwargs) -> None:
        return self.func(*args, **kwargs)

def my_function() -> None:
    print("Hello, World!")

obj = MyClass(my_function)
obj()  # Outputs: Hello, World!
```

This code defines a class `MyClass` that takes a callable function as an argument in its constructor and allows the class instance to be called like a function. The `my_function` is a regular function that prints "Hello, World!" when called. 

However, when we create an instance of `MyClass` with `my_function` and call it, it outputs "Hello, World!" as expected. 

Instead of directly calling the `my_function`, I want to add some pre-call and post-call functionality to the `MyClass` instance. How can I modify the `MyClass` to add this functionality?[/INST]