jyrinxat at mindspringdot
Feb 12, 2002, 8:48 PM
Post #1 of 1
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Overriding adding items to container
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I have a class derived from list (v2.2 is cool ...), and I want to
override its behavior so that a function is called whenever an object is
added to the list (in particular, I want to create a weak reference to
the parent). To wit:
>>> bob = myList()
>>> joe = myItem()
>>> bob.append(joe) # (or insert(joe), or bob[0:0]=[joe], etc.)
>>> joe.parent is bob
1
Is there any good, general way to do this? It seems I can override
__setitem__(), append(), insert(), and others, but it would seem more
elegant just to be able to change one thing. Is this possible? Thanks!
Jyrinx
jyrinxat [at] mindspringdot (spam-proofed)
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