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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 datatable_df(self):

 """ returns the dataframe representation of the symbol's final data """

        data = self._all_datatable_data()
        adf = pd.DataFrame(data)
        adf.columns = self.dt_all_cols
        return self._finish_df(adf, 'ALL')