Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:
One use of the start argument is used to specify an initial zero/metpy
value for the summation: 0 or 0.0 or Decimal(0) or [].
BTW, sum() isn't a good technique for concatenating lists. Instead use
something like:
result = []
for seq in data:
result.extend(seq)
A fast one-liner version:
result = list(itertools.chain.from_iterable(seq))
----------
nosy: +rhettinger
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7176>
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