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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_scen_file( filepath, columns={ "model": ["unspecified"], "scenario": ["unspecified"], "climate_model": ["unspecified"], }, **kwargs ):
 """ Read a MAGICC .SCEN file. Parameters filepath : str Filepath of the .SCEN file to read columns : dict Passed to ``__init__`` method of MAGICCData. See ``MAGICCData.__init__`` for details. kwargs Passed to ``__init__`` method of MAGICCData. See ``MAGICCData.__init__`` for details. Returns ------- :obj:`pymagicc.io.MAGICCData` ``MAGICCData`` object containing the data and metadata. """

    mdata = MAGICCData(filepath, columns=columns, **kwargs)

    return mdata