numpy.ma.MaskedArray.tostring
method
- 
MaskedArray.tostring(self, fill_value=None, order='C')[source] - 
This function is a compatibility alias for tobytes. Despite its name it returns bytes not strings.
 
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Licensed under the 3-clause BSD License.
    https://numpy.org/doc/1.18/reference/generated/numpy.ma.MaskedArray.tostring.html