Comment #2 on issue 2433 by asmeurer: Polys module function poly() needs
gens argument
http://code.google.com/p/sympy/issues/detail?id=2433
I think the gens kwarg should do it, i.e.,
In [7]: Poly(x*y, gens=[x])
Out[7]: Poly(y*x, x, domain='ZZ[y]')
But poly() should have a *gens anyway.
For your idea, how about adding a default_gens option to polyoptions that
is used as the generator if none can be inferred, but otherwise all
inferred ones are used.
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