Ok, finally answered my own question with help from this thread:
https://groups.google.com/forum/#!searchin/sympy/sympify$20function/sympy/dKiX0QHIFB4/pVFvdoDVlJwJ
My VB_POLY class that works as I want:
class VB_POLY(Function):
nargs = (1, 4)
def _eval_evalf(self, nprec):
obs_symbol,a,b,c = symbols('obs_symbol a b c')
poly_func = poly(a + b * obs_symbol + c * obs_symbol**2)
#poly_func.subs({obs_symbol: symFloat(self.args[0]), a:
symFloat(self.args[1]), b: symFloat(self.args[2]), c:
symFloat(self.args[3])})
result = poly_func.evalf(subs={obs_symbol: symFloat(self.args[0]), a:
symFloat(self.args[1]), b: symFloat(self.args[2]), c: symFloat(self.args[3
])})
return result
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