Kirby wrote:

There may be a better way to write the factory function than I've shown below. I'd like to see other solutions:

def makepoly(A,B,C): """ Build a polynomial function from coefficients """ return eval("lambda x: %s*x**2 + %s*x + %s" % (A,B,C))

How about this? class poly: def __init__(self, A, B, C): self.A, self.B, self.C = A, B, C def __call__(self, x): return self.A * x**2 + self.B * x + self.C

f = poly(2,3,4) f(10) 234

Having to know about classes pushes you more into learning Python as a programming language rather than just using Python as a math exploration tool, but that could be a good thing. You could even expand on the idea by adding additional methods that relate to polynomials (deriv, integral, roots, etc.): class poly: ... def deriv(self, x): return 2*self.A*x + self.B

f.deriv(2) 11

Brent