code: def export(self, swf, frame, **export_opts):
          
          self.wanted_frame = frame
          return super(FrameSVGExporterMixin, self).export(swf, *export_opts)
docs: Exports a frame of the specified SWF to SVG.
  
          @param swf   The SWF.
          @param frame Which frame to export, by 0-based index (int)