Reverse part of an array using NumPy

Question

I am trying to use array slicing to reverse part of a NumPy array. If my array is, for example,

a = np.array([1,2,3,4,5,6])

then I can get

Answer 1

>>> a = np.array([1,2,3,4,5,6])
>>> a[1:4] = a[3:0:-1]
>>> a
array([1, 4, 3, 2, 5, 6])