code: def write(self) -> None:
          
          if self.folders:
              init = hydpy.pub.timegrids.init
              timeunits = init.firstdate.to_cfunits('hours')
              timepoints = init.to_timepoints('hours')
              for folder in self.folders.values():
                  for file_ in folder.values():
                      file_.write(timeunits, timepoints)
docs: Call method |NetCDFFile.write| of all handled |NetCDFFile| objects.