# python slice second element of list of lists

import numpy as np A = np.array([[1,2,3,4,5],[1,2,3,4,5],[1,2,3,4,5]]) A[:,:3] Out[3]: array([[1, 2, 3], [1, 2, 3], [1, 2, 3]])

**Here is what the above code is Doing:**

1. A[:,:3] is selecting all rows and the first 3 columns.

2. A[:,:3] is selecting all rows and the first 3 columns.

3. A[:,:3] is selecting all rows and the first 3 columns.