numpy.ma.MaskedArray.tostring
method
- 
MaskedArray.tostring(fill_value=None, order='C')[source]
- 
This function is a compatibility alias for tobytes. Despite its name it returns bytes not strings. 
    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.ma.MaskedArray.tostring.html