code: def get_non_magic_cols(self):
          
          table_dm = self.data_model.dm[self.dtype]
          approved_cols = table_dm.index
          unrecognized_cols = (set(self.df.columns) - set(approved_cols))
          return unrecognized_cols
docs: Find all columns in self.df that are not real MagIC 3 columns.
  
          Returns
          --------
          unrecognized_cols : list