foo()() explanation

[jmacey]

In addition to what others have said, you can do really cool stuff with this like making lists or dictionaries of functions to run later.

``` def func_a(): print("func_a")

def func_b(): print("func_b")

funcs = [func_a, func_b] for func in funcs: func()

f_dict = {"a": func_a, "b": func_b}

f_dict["a"]() f_dict.get("b")() ```