This might help:
http://mail.python.org/pipermail/python-dev/2008-June/080111.html
Here is the most relevant part (quoting Guido):
> Does it help if I tell you that for "x <binop> y" we always try
> x.__binop__(y) before trying y.__reverse_binop__(x), *except* in the
> case where y is an instance of a subclass of the class of x?
jared
On Sep 22, 2009, at 7:06 AM, Chris Withers wrote:
Hi All,
I didn't see any docs on this:
http://docs.python.org/reference/datamodel.html?highlight=__eq__#object.__eq__
Where are the specifications on what happens if two objects are
compared and both have implementations of __eq__? Which __eq__ is
called? What happens if the first one called returns False? Is the
second one called? What is one implements __eq__ and the other __ne__?
If I've missed something, please point me in the right direction.
To all those about to tell me to go read the source: that's not good
enough here. I'm hoping there *are* "official" rules for how these
interact and they just need better linking in, otherwise, I worry
that IronPython could do one thing, Jython another and CPython a
third...
cheers,
Chris
--
Simplistix - Content Management, Batch Processing & Python Consulting
- http://www.simplistix.co.uk
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