create a function of a set of integers and a value for which you need to find the nearest one.

def find_nearest(array, value):
  array = np.asarray(array)
  idx = (np.abs(array-value)).argmin()
  return array[idx]

find_nearest(np.array([0, 2.1, 4.3, 6.5, 8.8, 11.0]), 1.5)