code: def start(self):
          
          self.check_dependencies()
          self.args = self.parser.parse_args()
  
          # Python 3 doesn't set the cmd if no args are given
          if not hasattr(self.args, 'cmd'):
              self.parser.print_help()
              return
  
          cmd = self.args.cmd
          try:
              if cmd.app_dir_required and not self.in_app_directory:
                  raise EnvironmentError(
                      "'enaml-native {}' must be run within an app root "
                      "directory not: {}".format(cmd.title, os.getcwd()))
              cmd.run(self.args)
          except sh.ErrorReturnCode as e:
              raise
docs: Run the commands