[issue7176] sum() doesn't work for lists.

[Raymond Hettinger]

Raymond Hettinger <rhettinger at 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))

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7176>
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