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numpy.ma.MaskedArray.__getitem__
method
MaskedArray.__getitem__(indx)[source]- 
    
x.__getitem__(y) <==> x[y]
Return the item described by i, as a masked array.
 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.ma.MaskedArray.__getitem__.html