code: def command(self, args):
          '''control options from cmdline'''
          if len(args) == 0:
              self.show_all()
              return
          if getattr(self, args[0], [None]) == [None]:
              print("Unknown setting '%s'" % args[0])
              return
          if len(args) == 1:
              self.show(args[0])
          else:
              self.set(args[0], args[1]f command(self, args):
          '''control options from cmdline'''
          if len(args) == 0:
              self.show_all()
              return
          if getattr(self, args[0], [None]) == [None]:
              print("Unknown setting '%s'" % args[0])
              return
          if len(args) == 1:
              self.show(args[0])
          else:
              self.set(args[0], args[1])
docs: control options from cmdline