[Python-3000] special attrs looked up on the type, not instance (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Wed Mar 14 12:14:00 CET 2007
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Neal Norwitz wrote:
[Georg] This is modeled after the principle that for new-style objects, special methods are looked up on the type, not the instance.
----- 1) I didn't remember this, do we have it documented somewhere? 2) Assuming #1 is correct, is this rule consistently applied? 3) How does (should) this affect 2.6 and migration to 3.0, if at all?
The principle isn't consistently applied - the with statement generates standard GET_ATTR opcodes, so it checks the instance first when looking for enter and exit.
It was questioned at the time, and Guido was OK with it - I believe his position was that defining special methods on instances may or may not affect behaviour, and whether or not it does so is implementation dependent.
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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