Lonnie Princehouse wrote: > Here's a curious hack I want to put up for discussion. I'm thinking of > writing a PEP for it.
A minor library change wouldn' t need a PEP. > Observation > ----------------- > I found myself using this construct for assembling multiple lists: > > foo = [] > qux = [] > > while some_condition: > a, b = calculate_something() > foo.append(a) > qux.append(b) > > Not elegant! I don't agree; however: > class better_list (list): > tail = property(None, list.append) This is an impressive, spiffy little class. > Well? I suspect it's too sneaky and not commonly useful enough to get serious consideration for the standard library. But definitely submit it to Python Cookbook: http://aspn.activestate.com/ASPN/Python/Cookbook/ Carl Banks P.S. to get rid of temporary variables while using regular lists: growing_lists = foo,qux while some_condition: for (s,x) in zip(growing_list,calculate_something()): list.append(s,x) No I don't really recommend it. -- http://mail.python.org/mailman/listinfo/python-list