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Asked: 2026-06-13T16:31:14+00:00

I have seen 2D arrays indexed in two different ways in Numpy. Assuming I

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I have seen 2D arrays indexed in two different ways in Numpy. Assuming I have an array A, I can type A[0:3, 2:5] or A[0:3][:,2:5]. Either way, I get the same slice of A.

I am curious why one would choose one over the other. Are there speed differences? Or is one simply more Pythonic than the other?

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1 Answer

  1. Editorial Team

    The first form is more pythonic and desireable, since it performs one slice operation. The second form actually slices twice.

    In the first form, A[0:3] returns a slice that is smaller than A, then the second slice operation slices the result from the first slice one.

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