Combine selector conditions

Question

I want to combine several conditions to select row/columns from an array.

For a matrix A, I know that

A[:, [1,3]] 

gives me the second and fourth column. Also,

A[:, :3]

works like a charm. However, I fail to combine the conditions:

A[:, [:3, 6, 7]]

But this gives me a syntax error. Can anyone tell me how to get this selection going?

Answer 1

In a nutshell, you can do:

A[:, range(3) + [6, 7]]

or

A[:, np.r_[:3, 6, 7]]