<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def extract_uasts(self):
 """ Returns a new DataFrame with the parsed UAST data of any blob added to its row. :rtype: UASTsDataFrame """

        return UASTsDataFrame(self._engine_dataframe.extractUASTs(),
                              self._session, self._implicits)