Interpolation Spline in python?

Question

What is the best method to interpolate Spline second-order Python? I’ve used interp1d, but not quite what I intend.

Example of what is intended.

from scipy.interpolate import interp1d 
import matplotlib.pyplot as plt 

x = [5,6,7,8,9,10,11]
y = [2,9,6,3,4,20,6]


xx = [1,2,3,4,5,6,7,8,9,10,11,12] 
f = interp1d(x, y, kind='quadratic') 
g = f(xx)

I intend to calculate the yy, but I get the following error:

Valueerror: A value in x_new is Below the Interpolation range.

I would like to get to python something similar to the following in Matlab

x=[5,6,7,8,9,10,11]
y=[2,9,6,3,4,20,6]
xx=[1,2,3,4,5,6,7,8,9,10,11,12]
yy = spline(x,y,xx);
plot(x,y,'o',xx,yy)