[issue2226] Small _abcoll Bugs / Oddities
Armin Ronacher
report at bugs.python.org
Mon Mar 3 22:25:01 CET 2008
New submission from Armin Ronacher:
_abcoll.py references intertools.chain but doesn't import it. This
breaks Set subclasses. Additionally the abstract base classes don't
provide the right hand operator callbacks or how you want to call them.
So __add__ is there but __radd__ not which for example leads to the
problem that "foo() + set()" works but "set() + foo" not.
And the third oddity in that module is that Callable defines an abstract
method for __contains__ which makes no sense but none for __call__.
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<http://bugs.python.org/issue2226>
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