numpy.ma.MaskedArray.tostring
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MaskedArray.tostring(fill_value=None, order='C')[source]
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This function is a compatibility alias for tobytes. Despite its name it returns bytes not strings. 
    © 2008–2016 NumPy Developers
Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.MaskedArray.tostring.html