<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def show_report(self, session, *levels):
 """ Shows the report that has been generated """

        if levels:
            self.make_report(session, *levels)

        if self.__report:
            session.write_line(self.to_json(self.__report))
        else:
            session.write_line("No report to show")