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The current results are quite "interesting"
>>> math.sum([1e308, 1e308, -1e308])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
OverflowError: math range error
>>> math.sum([1e308, -1e308, 1e308])
1e+308
Handling this case would require holding the finite, prior sum at an 
intermediate overflow in a separate array, say overflows. Then, add the 
partials which may create additional overflows. Finally, keep adding 
the overflows (accurately?) until none remain or until none can be added 
without overflow.
/Jean Brouwers