Extrapolation

[bananen]

Hi!

I have two lists of data that I have done a linear fit on, and I would like to extrapolate this linearly but I don't really know how. I have attempted to do that but it's not working. 

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

x=[1,2,3,4,5,6]
y=[2,4,6,8,10,12]

p2=np.polyfit(x,y,1)

f=interp1d(x,y,fill_value="extrapolate")

Any help is appriciated!