I have a numpy 2D array,

import numpy as np
array1 = array([[ 1,  2,  1,  1],[ 2,  2,  2,  1],[ 1,  1,  1,  1],[1,  3, 1, 1],[1,  1, 1, 1]])

I would like to find the element '3' and know its location. So, I could try

condition = array1 == 3

and then to find the arguments, I could try

np.argwhere(condition)

How else does one locate the indices where 3 is located?

You can also use where, returning a tuple of coordinate:

In [34]: np.where(array1==3)
Out[34]: (array([3]), array([1]))