Terry J. Reedy added the comment:
You are right, I did not look deep enough. I was fooled by the conversion of
NotImplemented, returned from object.__le__, etc, to TypeError. Sorry for that
noise.
For comparison and arithmetic, the actual alternative to defining a function
that returns NotImplemented seems to be to not define it at all.
class C():
def __ge__(self, other):
return True
def __add__(self, other):
return 44
__radd__ = __add__
class O():
pass # removed NotImplemented defs
c = C()
o = O()
print(c >= o, o <= c)
# True True
print(c + o, o + c)
# 44 44
(I looked at the codes for binary_op1 in abstract.c and do_richcompare in
object.c and do not yet see any effective difference between not defined and a
NotImplemented return.)
I'll take a look at the patch later.
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<http://bugs.python.org/issue12067>
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