Comment #3 on issue 2433 by matt...@gmail.com: Polys module function poly() needs gens argument
http://code.google.com/p/sympy/issues/detail?id=2433
To construct polynomials you should really use Poly. poly() is a replacement for expand() in cases where expand is too slow. After all I don't see a reason why poly() has different interface from other polynomial manipulation functions. I will submit a pull request improving poly().
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