decorators.py

# python functions are objects
# can be passed stored in variables, passed as args, returned, etc

def wrap(func):
    print("wow!")
    func()
    print("oo")

def hello():
    print("hello!")

"""
A decorator is a function that allows us to wrap another function in order 
to extend the behavior of the wrapped function, without permanently modifying it.
"""

def dec(func):
    def wrap():
        print('Extended behaviour!')
        func()
    return wrap

@dec
def decoratee():
    print('hello!')

# also can do: decoratee = dec(decoratee)


if __name__ == '__main__':
    # I.
    x = wrap
    x(hello)

    # II.
    decoratee()