On Feb 6, 10:21 pm, rdmur...@bitdance.com wrote: > Quoth Mensanator <mensana...@aol.com>: > > def flatten(listOfLists): > > return list(chain.from_iterable(listOfLists)) > > Python 2.6.1 (r261:67515, Jan 7 2009, 17:09:13) > [GCC 4.3.2] on linux2 > Type "help", "copyright", "credits" or "license" for more information. > >>> from itertools import chain > >>> list(chain.from_iterable([1, 2, [3, 4]])) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: 'int' object is not iterable > >>> list(chain(*[1, 2, [3, 4]])) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: 'int' object is not iterable > >>> list(chain.from_iterable(['abcd', 'efg', [3, 4]])) > ['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. -- http://mail.python.org/mailman/listinfo/python-list
