Gabriel Genellina wrote: > En Mon, 04 Jan 2010 04:58:54 -0300, Chris Rebert <c...@rebertia.com> > escribió: >> On Sun, Jan 3, 2010 at 11:51 PM, Gabriel Genellina >> <gagsl-...@yahoo.com.ar> wrote: > >>> py> [1,2,3] + (4,5) >>> Traceback (most recent call last): >>> File "<stdin>", line 1, in <module> >>> TypeError: can only concatenate list (not "tuple") to list > > Sorry, I inadvertedly posted an incomplete message. Note the last part: > >>> In-place addition += does work: >>> >>> py> a = [1,2,3] >>> py> a += (4,5) >>> py> a >>> [1, 2, 3, 4, 5] > >> Given that tuples are sometimes used as a poor man's object (i.e. >> collection of data fields), whereas lists are not typically used that >> way, I'd say it's probably a good thing an explicit type conversion is >> required here. > > In that case += should not be allowed either... >
I'd be strongly inclined to think the result would be the sequence on the left with the data from the second sequence appended to it. What's wrong with a little duck typing here eh? Roger. -- http://mail.python.org/mailman/listinfo/python-list
