Chris

Python 3.1.1 (r311:74480, Sep 11 2009, 19:55:23)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from __future__ import print_function
>>> class A(object):
...     def __init__(self, name):
...             self.name = name
...     def __eq__(self, other):
...             print(self.name, "eq", self, other)
...             return NotImplemented
...     def __ne__(self, other):
...             print(self.name, "ne", self, other)
...             return NotImplemented
...     def __add__(self, other):
...             print(self.name, "add", self, other)
...             return NotImplemented
...     def __radd__(self, other):
...             print(self.name, "radd", self, other)
...             return NotImplemented
...
...     def __lt__(self, other):
...             print(self.name, "lt", self, other)
...             return NotImplemented
...     def __gt__(self, other):
...             print(self.name, "gt", self, other)
...             return NotImplemented
...
...
>>> class B(object):
...     def __init__(self, name):
...             self.name = name
...     def __eq__(self, other):
...             print(self.name, "eq", self, other)
...             return NotImplemented
...     def __ne__(self, other):
...             print(self.name, "ne", self, other)
...             return NotImplemented
...     def __add__(self, other):
...             print(self.name, "add", self, other)
...             return NotImplemented
...     def __radd__(self, other):
...             print(self.name, "radd", self, other)
...             return NotImplemented
...
...     def __lt__(self, other):
...             print(self.name, "lt", self, other)
...             return NotImplemented
...     def __gt__(self, other):
...             print(self.name, "gt", self, other)
...             return NotImplemented
...
>>> A('left') == A('right')
left eq <__main__.A object at 0x7fb150ada910> <__main__.A object at 0x7fb150ada990>
right eq <__main__.A object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada910>
right eq <__main__.A object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada910>
left eq <__main__.A object at 0x7fb150ada910> <__main__.A object at 0x7fb150ada990>
False
>>> A('left') == B('right')
left eq <__main__.A object at 0x7fb150ada950> <__main__.B object at 0x7fb150ada910>
right eq <__main__.B object at 0x7fb150ada910> <__main__.A object at 0x7fb150ada950>
right eq <__main__.B object at 0x7fb150ada910> <__main__.A object at 0x7fb150ada950>
left eq <__main__.A object at 0x7fb150ada950> <__main__.B object at 0x7fb150ada910>
False
>>> A('left') != A('right')
left ne <__main__.A object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada950>
right ne <__main__.A object at 0x7fb150ada950> <__main__.A object at 0x7fb150ada990>
right ne <__main__.A object at 0x7fb150ada950> <__main__.A object at 0x7fb150ada990>
left ne <__main__.A object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada950>
True
>>> A('left') != B('right')
left ne <__main__.A object at 0x7fb150ada910> <__main__.B object at 0x7fb150ada990>
right ne <__main__.B object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada910>
right ne <__main__.B object at 0x7fb150ada990> <__main__.A object at 0x7fb150ada910>
left ne <__main__.A object at 0x7fb150ada910> <__main__.B object at 0x7fb150ada990>
True
>>>