May 30, 2004
5:34 a.m.
At 01:24 AM 5/30/04 -0400, Bob Ippolito wrote:
On May 29, 2004, at 1:06 PM, Raymond Hettinger wrote:
Instances of classes inheriting from str, tuple, etc cannot be weakly referenced. Does anyone know the reason for this?
They can not accept non-empty __slots__ either, which is probably closer to the source of the problem. I have no idea what the reason is. I imagine it's something to do with optimization, and/or because they are immutable.
More likely, because they are variably-sized, and their variably-sized portions are at fixed offsets. (OTOH, I don't see why their subclasses can still have a __dict__ slot, then...)