On Sun, Aug 16, 2009 at 6:49 AM, Steven D'Aprano<st...@remove-this-cybersource.com.au> wrote: > On Sun, 16 Aug 2009 05:55:48 -0400, Chris Rebert wrote: >> On Sun, Aug 16, 2009 at 5:47 AM, Terry<terry.yin...@gmail.com> wrote: >>> Hi, >>> >>> Is there a simple way (the pythonic way) to flatten a list of list? >>> rather than my current solution: >>> >>> new_list=[] >>> for l in list_of_list: >>> new_list.extend(l) >>> >>> or, >>> >>> new_list=reduce(lambda x,y:x.extend(y), list_of_list) >> >> #only marginally better: >> from operator import add >> new_list = reduce(add, list_of_list) > > Surely that's going to be O(N**2)?
The OP asked for "simple", not "best", "most proper", or "fastest". My comment was intended to mean that the code was marginally *simpler*, not faster. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list