Hi, A friend of mine stumbled upon the following behavior:
---cut--- >>> class A(object): pass ... >>> class B(object): ... def __add__(self, other): ... print 'B: adding B and %s objects.' % other.__class__.__name__ ... >>> class C(object): ... def __radd__(self, other): ... print 'C: adding C and %s objects.' % other.__class__.__name__ ... >>> a, b, c = A(), B(), C() >>> b + c B: adding B and C objects. >>> a + c C: adding C and A objects. # so far, quite logical. now let's do this: >>> 1 + c C: adding C and int objects. --uncut-- My first expectation would be to get a TypeError here, as ints indeed have an __add__ method, and they do not know anything about C objects (obviously :) ). On second thought, giving client code priority to handle things has it's merits. The problem is that I found no mention of this behavior in the docs. P.S. tested in 2.5 through 3.0 and PyPy Thanks. -- Alex. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
