Colon difference in Matlab and Python

What is the equivalent to someA开发者_开发百科rray(:,1,1) in python from Matlab?

In python someArray[:][0][0] produces a different value

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someArray[:,0,0] is the Python NumPy equivalent of MATLAB's someArray(:,1,1). I've never figured out how to do it in pure Python, the colon slice operation is a total mystery to me with lists-of-lists.