I've just been bitten yet again by the fact you can't have a weakref
to a bound method! I find myself wanting to do this whenever I have a
registry of callback functions.
Could we in py3k either
1) make weakrefs to bound methods work? A weakref to a bound method
should mean hold the weakref on the instance and bind the method at
the last moment.
or
2) throw an exception when you attempt to take a weak reference of a
bound method? Maybe only when it has a single refcount?
Eg
Python 3.0a2+ (py3k:60831, Feb 15 2008, 09:52:40)
[GCC 4.2.3 20071123 (prerelease) (Debian 4.2.2-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from weakref import WeakKeyDictionary
>>> d=WeakKeyDictionary()
>>> class A(object):
... def f(self): print("hello")
...
>>> a=A()
>>> a.f()
hello
>>> d[a.f] = True
>>> d.keys()
[]
>>>
I know how to work around the problem. The fact that it passes
completely silently uses up lots of developer time debugging it
though!
Thanks!
--
Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick
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