[pypy-dev] Unbound method must be called with instance as first argument
hpk at trillke.net
Mon Jul 5 12:15:24 CEST 2004
[Richard Emslie Sat, Jul 03, 2004 at 05:54:23PM +0100]
> Seems the problem is that Method does not have a __get__ (since C.m
> returns a Method not a Function via __get__ while assigning to D). In
> other words
> mm = C.m
> D.m = mm
> assert D.m == mm # True since no __get__()
> assert C.m != mm # True since __get__() creates a new method
> Some simple fixes are
> 1. add a __get__() method to interpreter.function.Method which forwards
> request onto w_function attribute.
yes, i think this is the right way.
> 2. put a hack in objspace/descrooperation.DescrOperation in get() to
> handle special case for Method (yuk!)
> The CPython implementation seems to be doing some hairy caching instead of
> creating new method each __get__(), so it hard to tell if this is correct
> behaviour. And the above fixes are only based on my understanding of
> desciptors, which has a high probability to be wrong. If someone backs me
> up I can commit fix 1. :-)
I might have a lower probabiliy of beeing wrong but Samuele probably has one
close to zero. I suggest you go with your first solution (and also write
some tests for it :-).
Btw, it would be really nice to be able to run app-level tests against
CPython apart from PyPy/std basically ensuring us we are beeing compatible.
However, this probably can only be implemented nicely after we do the utest-switch.
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