[Python-ideas] Bad programming style in decorators?

[Guido van Rossum]

On Sat, Jan 2, 2016 at 10:42 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 3 January 2016 at 13:48, Guido van Rossum <guido at python.org> wrote:
> > Whoops, Nick already did the micro-benchmarks, and showed that creating a
> > function object is faster than instantiating a class. He also measured
> the
> > size, but I think he forgot that sys.getsizeof() doesn't report the size
> > (recursively) of contained objects -- a class instance references a dict
> > which is another 288 bytes (though if you care you can get rid of this by
> > using __slots__).
>
> You're right I forgot to account for that (54 bytes without __slots__
> did seem surprisingly small!), but functions also always allocate
> f.__annotations__ at the moment.
>
> Always allocating f.__annotations__ actually puzzled me a bit - did we
> do that for a specific reason, or did we just not think of setting it
> to None when it's unused to save space the way we do for other
> function attributes? (__closure__, __defaults__, etc)
>

Where do you see that happening? The code in funcobject.c seems to indicate
that it's created on demand. (And that's how I remember it always being.)

-- 
--Guido van Rossum (python.org/~guido)
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