code: def pformat_program_dump(self, program_dump, program_start=None):
          
          assert isinstance(program_dump, bytearray)
  
          if program_start is None:
              program_start = self.DEFAULT_PROGRAM_START
          return self.listing.pformat_program_dump(program_dump, program_start)
docs: format a BASIC program dump. Useful for debugging.
          returns a list of formated string lines.