method
MaskedArray.__setitem__(self, indx, value)
[source]
x.__setitem__(i, y) <==> x[i]=y
Set item described by index. If value is masked, masks those locations.
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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ma.MaskedArray.__setitem__.html