numpy.ma.MaskedArray.__deepcopy__
method
- 
MaskedArray.__deepcopy__(self, memo=None)[source] - 
Used if
copy.deepcopyis called on an array. 
    © 2005–2020 NumPy Developers
Licensed under the 3-clause BSD License.
    https://numpy.org/doc/1.18/reference/generated/numpy.ma.MaskedArray.__deepcopy__.html