Comment #11 on issue 1376 by Vinzent.Steinberg: sympy.sum overrides built-in sum with a different call syntax
http://code.google.com/p/sympy/issues/detail?id=1376
I don't have a strong opinion about this and I don't like both variants. I slightly prefer sum_(), but in the end it is not that important. It's fine either way if you know it, I think the main problem is confusion for newcomers.
Maybe we should add to the docs that 'from sympy import *' overwrites the built-in sum.
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