Return column 2 of a but keep it 2-D — shape (3, 1), not (3,)
NumPy · from Indexing and slicing
a[i, j]start:stop:stepa[:, 1]negative indices...a[i][j]Putting the kettle on…
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Exercise 3
Return column 2 of a but keep it 2-D — shape (3, 1), not (3,).
your answer
stuck? the lesson behind it
Indexing and slicing
One range per axis — and why an integer removes an axis while a slice keeps it.