numpy.ma.MaskedArray.__deepcopy__
method
- 
ma.MaskedArray.__deepcopy__(memo, /) → Deep copy of array.[source] - 
Used if
copy.deepcopyis called on an array. 
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Licensed under the 3-clause BSD License.
    https://numpy.org/doc/1.21/reference/generated/numpy.ma.MaskedArray.__deepcopy__.html