This one line command first calculates \(\ln T\) from \(T\), then evaluates the Chebyshev fit to find \(\ln R\), and finally calculates \(R\).  To calculate the resistances corresponding to an array of temperature values all at once, we simply replace  the variable 'T_value' with a numpy array of temperature values. 
For convenience, we define a function TtoR that will convert an array of temperature values to an array of resistance values for any given set of Chebyshev coefficients using the steps outlined above: