Replace values of a numpy index array with values of a list

Question

Suppose you have a numpy array and a list:

>>> a = np.array([1,2,2,1]).reshape(2,2)
>>> a
array([[1, 2],
       [2, 1]])
>>> b = [         


        

Answer 1

I was unable to set the flags, or use a mask to modify the value. In the end I just made a copy of the array.

a2 = np.copy(a)