flatten a level one list

[Sion Arrowsmith]

In article <7x8xtlq03t.fsf at ruckus.brouhaha.com>,
Paul Rubin  <http://phr.cx@NOSPAM.invalid> wrote:
>Robin Becker <robin at SPAMREMOVEjessikat.fsnet.co.uk> writes:
>> >>>>>reduce(operator.add,a)
>> ...
>That's what I hoped "sum" would do, but instead it barfs with a type
>error.  So much for duck typing.

sum(...)
    sum(sequence, start=0) -> value

If you're using sum() as a 1-level flatten you need to give it
start=[].

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