And here's an example from trunk:

Python 2.7a0 (trunk:75012M, Sep 22 2009, 11:16:39) 
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class A(object):
...     def __eq__(self, other):
...         print "A.__eq({!r}, {!r})".format(self, other)
...         return NotImplemented
... 
>>> A() == A()
A.__eq(<__main__.A object at 0x39f670>, <__main__.A object at 0x39f610>)
A.__eq(<__main__.A object at 0x39f610>, <__main__.A object at 0x39f670>)
A.__eq(<__main__.A object at 0x39f670>, <__main__.A object at 0x39f610>)
A.__eq(<__main__.A object at 0x39f610>, <__main__.A object at 0x39f670>)
A.__eq(<__main__.A object at 0x39f610>, <__main__.A object at 0x39f670>)
A.__eq(<__main__.A object at 0x39f670>, <__main__.A object at 0x39f610>)
False