Solve in Python:
Create an identity matrix of the specified size( >= 0).

Some examples:

```
(1)  =>  [[1]]

(2) => [ [1,0],
         [0,1] ]

       [ [1,0,0,0,0],
         [0,1,0,0,0],
(5) =>   [0,0,1,0,0],
         [0,0,0,1,0],
         [0,0,0,0,1] ]   

```
from numpy import identity, ndarray

def get_matrix(n):
   return identity(n).tolist()