Ubuntu 12.04 LTS
Python 2.7.3
Sympy from master https://github.com/sympy/sympy
Hadoop 1.0.2

The problem with solve() has gone, but another error occured,  "KeyError: 
0" in a line where I use Subs,

     cost = Subs( cost, tuple( x for x in keys[ : -1]), tuple( x for x in 
result[ 0][ :-1])).doit()

where result is the result of solver, keys is a list of variables( symbol 
format).

solve_poly_system() has the same behavior as before.

It would be helpful if I attached my code?

    

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