Thanks! On Fri, Mar 19, 2010 at 16:05, Michael Foord <fuzzy...@voidspace.org.uk> wrote: > On 19/03/2010 12:46, Alex A. Naanou wrote: >> >> [snip...] >>>>> >>>>> class C(object): >>>>> >> >> ... def __radd__(self, other): >> ... print 'C: adding C and %s objects.' % other.__class__.__name__ >> ... >> >>>>> >>>>> a, b, c = A(), B(), C() >>>>> 1 + c >>>>> >> >> C: adding C and int objects. >> >> >> > > That is the whole point of the __radd__ method. ints don't know how to add > themselves to C objects, so int.__add__ will return NotImplemented and then > Python will try C.__radd__. > > All the best, > > Michael > >> --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. >> >> > > > -- > http://www.ironpythoninaction.com/ > http://www.voidspace.org.uk/blog > > READ CAREFULLY. By accepting and reading this email you agree, on behalf of > your employer, to release me from all obligations and waivers arising from > any and all NON-NEGOTIATED agreements, licenses, terms-of-service, > shrinkwrap, clickwrap, browsewrap, confidentiality, non-disclosure, > non-compete and acceptable use policies (”BOGUS AGREEMENTS”) that I have > entered into with your employer, its partners, licensors, agents and > assigns, in perpetuity, without prejudice to my ongoing rights and > privileges. You further represent that you have the authority to release me > from any BOGUS AGREEMENTS on behalf of your employer.
P.S. like the licence :) > > > -- 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
