[Python] What does array operator '[:, None]' do in Python? [duplicate]

Given

x=np.arange(5)


Which results in

array([0, 1, 2, 3, 4])


What is x[:,None] doing?

It makes

array([[0],
[1],
[2],
[3],
[4]])


I can see it is turning each element of array x into a subarray of 1 element.

But why, and for next time, how would I search Python documentation to find this operator and how it works?

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