Marc D.M. wrote:
> On Thu, 2006-09-07 at 13:28 -0500, Adrian Holovaty wrote:
>> On 9/7/06, Michael Spencer <[EMAIL PROTECTED]> wrote:
>>
>>> If you're really hunting for speed, there is a significant boost available
>>> in
>>> the common special case of a python function curried with one positional
>>> argument. In this case, you can [ab]use the method binding machinery, e.g.:
>>> [...]
>>> This is about twice as fast as curry2 for the case of a python function
>>> curried
>>> with one argument. It also offers better introspection than either curry1 or
>>> curry2, since the original signature is preserved. It's a bigger change
>>> than
>>> the curry2 though, since it changes the type of the curry from function to
>>> bound
>>> method.
>> I was with you until "it changes the type of the curry from function
>> to bound method." How does it do that?
>>
>> Adrian
>
> I think what's going on is that in the try : except clause, the return
> value is the actual bound method, retrieved using the __get__
> magic-method.
>
Yep.
> And it doesn't work very well that way either. I've tried Michael's
> method and the whole house comes tumbling down. See traceback below when
> trying to load a flatpage.
>
[snip...house falling down]
I should have included a guard to ensure that the shortcut applies only to
functions, not bound methods. Something like the following...
import types
def curry3(_curried_fct, *args, **kwargs):
if len(args) == 1 and type(_curried_fct) is types.FunctionType:
# Special case where we try to abuse the descriptor
try:
return _curried_fct.__get__(args[0])
except AttributeError:
# built-ins fail - handle them in the normal way
pass
def _curried(*moreargs, **morekwargs):
return _curried_fct (*(args+moreargs), **dict(kwargs, ** morekwargs))
return _curried
This is still just a sketch, but my own django app runs with curry defined this
way.
Michael
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