Though it is hard to resist Thierry Dumont's invitation
to a large cup of coffee, my inclination would be to
compile an MPFR program for calculations of this sort.
Incidentally, range(-10000,10000) is not symmetric about 0.
In fact, there's no need for negative indices at all in
this particular sum.

Best regards,
Greg Marks

    ------------------------------------------------
   | Greg Marks                                     |
   | Department of Mathematics and Computer Science |
   | St. Louis University                           |
   | St. Louis, MO 63103-2007                       |
   | U.S.A.                                         |
   |                                                |
   | Phone: (314)977-7206                           |
   | Fax: (314)977-1452                             |
   | Web: http://math.slu.edu/~marks                |
    ------------------------------------------------

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