Dear all,
First of all thanks to Simon for his optimization of the cached_method
decorator. Lots of code are now much faster. However it seems that there is a
problem using it with inheritance. I need to overload a cached method to
provide a default value for its argument. Here is a code reproducing the
problem:
class A(SageObject):
@cached_method
def toto(self, arg):
return arg+1
class B(A):
def toto(self, arg=2):
return super(B, self).toto(arg)
class C(A):
def toto(self, arg=2):
return A.toto(self, arg)
Then:
sage: b = B()
sage: b.toto()
3
sage: b.toto()
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
/home/data/Sage-Install/sage-4.6.2/devel/sage-combinat/sage/categories/<ipython
console> in <module>()
/home/florent/src/Sage/sage/local/lib/python2.6/site-packages/sage/misc/cachefunc.pyc
in __call__(self, *args, **kwds)
549 k = self._default_key
550 except AttributeError:
--> 551 k = self._default_key = self.get_key()
552 try:
553 return self.cache[k]
/home/florent/src/Sage/sage/local/lib/python2.6/site-packages/sage/misc/cachefunc.pyc
in get_key(self, *args, **kwds)
601 if self._inst_in_key:
602 return
(self._instance,self._argumentfixer.fix_to_pos(*args,**kwds))
--> 603 return self._argumentfixer.fix_to_pos(*args,**kwds)
604
605 def __get__(self, inst, cls=None):
/home/florent/src/Sage/sage/local/lib/python2.6/site-packages/sage/misc/function_mangling.so
in sage.misc.function_mangling.ArgumentFixer.fix_to_pos
(sage/misc/function_mangling.c:1423)()
KeyError: 'arg'
In this case, during the call super(B, self).toto(arg) the method b.toto is
replaced by an attribute which overload it.
Using the C class thing are even more weird:
sage: c = C()
sage: c.toto()
[...]
TypeError: toto() takes exactly 2 arguments (3 given)
So the question are: is this a known bug ? Is this expected ? Are there any
idea to solve the problem ?
Cheers,
Florent
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