from scipy.interpolate import interp1d
import numpy as np
xs = np.arange(10)
ys = 2*xs + 1
interp_func = interp1d(xs, ys)
newarr = interp_func(np.arange(2.1, 3, 0.1))
print(newarr)
[ 5.2 5.4 5.6 5.8 6. 6.2 6.4 6.6 6.8]