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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 open_dataset(path, **kwargs):
 # type: (str, T.Any) -> xr.Dataset """ Return a ``xr.Dataset`` with the requested ``backend_kwargs`` from a GRIB file. """

    if 'engine' in kwargs and kwargs['engine'] != 'cfgrib':
        raise ValueError("only engine=='cfgrib' is supported")
    kwargs['engine'] = 'cfgrib'
    return xr.backends.api.open_dataset(path, **kwargs)