numpy.ma.MaskedArray.__getitem__
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MaskedArray.__getitem__(indx)[source]
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x.__getitem__(y) <==> x[y] Return the item described by i, as a masked array. 
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.ma.MaskedArray.__getitem__.html