Rhamphoryncus <rha...@gmail.com> wrote: > On Feb 6, 10:21=A0pm, rdmur...@bitdance.com wrote: > > Quoth Mensanator <mensana...@aol.com>: > > > def flatten(listOfLists): > > > =A0 =A0 return list(chain.from_iterable(listOfLists)) > > > > =A0 =A0 Python 2.6.1 (r261:67515, Jan =A07 2009, 17:09:13) > > =A0 =A0 [GCC 4.3.2] on linux2 > > =A0 =A0 Type "help", "copyright", "credits" or "license" for more informa= > tion. > > =A0 =A0 >>> from itertools import chain > > =A0 =A0 >>> list(chain.from_iterable([1, 2, [3, 4]])) > > =A0 =A0 Traceback (most recent call last): > > =A0 =A0 =A0 File "<stdin>", line 1, in <module> > > =A0 =A0 TypeError: 'int' object is not iterable > > =A0 =A0 >>> list(chain(*[1, 2, [3, 4]])) > > =A0 =A0 Traceback (most recent call last): > > =A0 =A0 =A0 File "<stdin>", line 1, in <module> > > =A0 =A0 TypeError: 'int' object is not iterable > > =A0 =A0 >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]])) > > =A0 =A0 ['a', 'b', 'c', 'd', 'e', 'f', 'g', 3, 4] > > What usecase do you have for such inconsistently structured data? > > If I'm building a tree I use my own type for the nodes, keeping them > purely internal, so I can always use isinstance without worrying about > getting something inconvenient passed in.
I don't have any use cases myself, I'm just pointing out that this doesn't answer the concerns of the OP, who presumably does. --RDM -- http://mail.python.org/mailman/listinfo/python-list
