Comment #3 on issue 1570 by asmeurer: index variable should not need to be
defined
http://code.google.com/p/sympy/issues/detail?id=1570
Another workaround is to just run everything through sympify as a string,
which will automatically create all
variables for you:
>>> from sympy import sum, sympify
>>> sympify("sum(1,(k,1,5))")
5
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