Updates:
Status: Started
Owner: mattpap
Labels: NeedsReview
Comment #5 on issue 1376 by mattpap: sympy.sum overrides built-in sum with
a different call syntax
http://code.google.com/p/sympy/issues/detail?id=1376
As I work with built-in sum() a lot when developing sympy.polys, I fixed
this issue
in polys8 branch:
http://github.com/mattpap/sympy-polys/commit/2441c951c1d6e6877ea62ae9f7cb0de0611f1f72
Example:
In [1]: sum([])
Out[1]: 0
In [2]: sum([], 3)
Out[2]: 3
In [3]: sum([], start=3)
Out[3]: 3
In [4]: sum([1,2,3], 3)
Out[4]: 9
In [5]: sum([1,2,3], start=3)
Out[5]: 9
In [6]: sum(x**k, (k, 0, n))
Out[6]:
1 + n
1 - x
──────────
1 - x
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