Timothy Babytch wrote: > Serhiy Storchaka wrote: > > >>>sum([['N', 'F'], ['E'], ['D']], []) > ['N', 'F', 'E', 'D'] > > THE BEST! Hmmm. Maybe, unless readability as in "self-documenting code" is important to you... Preceding the above with "flatten = sum" would perhaps be an adequate improvement. -Peter