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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 check_geophysical_vars_standard_name(self, ds):
        '''
        Check that geophysical variables contain standard names.

        :param netCDF4.Dataset ds: An open netCDF dataset
        '''
        results = []
        for geo_var in get_geophysical_variables(ds):
            results.append(
                self._has_var_attr(ds, geo_var, 'standard_name', 'geophysical variables standard_name'),
            )
        return results