code: def App(apptype, data_flow_kernel=None, walltime=60, cache=False, executors='all'):
      
  
      from parsl.app.python import PythonApp
      from parsl.app.bash import BashApp
  
      logger.warning("The 'App' decorator will be deprecated in Parsl 0.8. Please use 'python_app' or 'bash_app' instead.")
  
      if apptype == 'python':
          app_class = PythonApp
      elif apptype == 'bash':
          app_class = BashApp
      else:
          raise InvalidAppTypeError("Invalid apptype requested {}; must be 'python' or 'bash'".format(apptype))
  
      def wrapper(f):
          return app_class(f,
                           data_flow_kernel=data_flow_kernel,
                           walltime=walltime,
                           cache=cache,
                           executors=executors)
      return wrapper
docs: The App decorator function.
  
      Args:
          - apptype (string) : Apptype can be bash|python
  
      Kwargs:
          - data_flow_kernel (DataFlowKernel): The :class:`~parsl.dataflow.dflow.DataFlowKernel` responsible for
            managing this app. This can be omitted only
            after calling :meth:`parsl.dataflow.dflow.DataFlowKernelLoader.load`.
          - walltime (int) : Walltime for app in seconds,
               default=60
          - executors (str|list) : Labels of the executors that this app can execute over. Default is 'all'.
          - cache (Bool) : Enable caching of the app call
               default=False
  
      Returns:
           A PythonApp or BashApp object, which when called runs the apps through the executor.