(newbie) Float() and high precision

What's the best way to do higher precision maths than the standard Float()? -- http://mail.python.org/mailman/listinfo/python-list

Linear regression in 3 dimensions

Hi all, I am seeking a module that will do the equivalent of linear regression in 3D to yield a best fit a plane through a set of points (X1, Y1, Z1), (X1, Y1, Z1),... (Xn, Yn, Zn). The resulting equation to be of the form: Z = aX + bY + c The function I need would take the set of points and r