[Tutor] basic decorator question

[Peter Otten]

bruce wrote:

> Hi.
> 
> I've seen sites discuss decorators, as functions that "wrap" and
> return functions.
> 
> But, I'm sooo confuzed! My real question though, can a decorator have
> multiple internal functions? All the examples I've seen so far have a
> single internal function.
> 
> And, if a decorator can have multiple internal functions, how would
> the calling sequence work?
> 
> But as a start, if you have pointers to any really "basic" step by
> step sites/examples I can look at, I'd appreciate it. I suspect I'm
> getting flumoxed by something simple.

Here's a completely useless decorator to drive home the point that

@deco
def f(...):
    ...

is only a fancy way to write

def f(...):
   ...
f = deco(f)


>>> def fortytwo(func):
...     print("I don't care about your function")
...     return 42
... 
>>> @fortytwo
... def f():
...     print("this is important")
... 
I don't care about your function
>>> f()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> f
42