If a class and its superclass both define __slots__, it appears that
__getstate__() is not inherited from the superclass. Example:
"""
class Base (object):
__slots__ = []
def __getstate__ (self):
return tuple([getattr(self, attr) for attr in self.__slots__])
class Thing (Base):
__slots__ = ['a', 'b']
def __init__ (self):
self.a = 42
self.b = "boo!"
abstract = Base()
thing = Thing()
print abstract.__getstate__
print thing.__getstate__
"""
When I run this with a not-quite-current CVS Python:
<bound method Base.__getstate__ of <__main__.Base object at 0x401f73b8>>
<built-in function __getstate__>
The upshot of this is that I can't just define one __getstate__() in the
superclass of a bunch of __slots__-using classes -- I guess I'll have to
set __getstate__ manually for each class. ;-( If this is a feature, is
it documented anywhere?
(BTW, I see the same behaviour with Python 2.2.2.)
Greg
--
Greg Ward <gward@python.net> http://www.gerg.ca/
"Very funny, Scotty. Now beam my *clothes* down."
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