Write a decorator that prints 'hello' before a function and 'bye' after, with deferred start.

A deferred decorator is a function that returns a wrapper function but does not call the decorated function immediately. Instead, it returns a function that can be called later.

Example in Python:

from functools import wraps

def delayed_decorator(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        print("hello")
        result = func(*args, **kwargs)
        print("bye")
        return result

    def delayed():
        return wrapper()

    return delayed

@delayed_decorator
def my_function():
    print("Executing function")

# Function is not executed immediately
f = my_function

# Deferred execution
f()

Here, after decoration, my_function returns the delayed function, which can be called later. When called, it prints "hello", then executes the function, then "bye".