code: def pull(ctx, source, destination, progress):
      
      mp_pool = multiprocessing.Pool(multiprocessing.cpu_count() * 2)
      multi = True if len(ctx.obj['hosts']) > 1 else False
      for ip in ctx.obj['hosts']:
          mp_pool.apply_async(wrap.open_connection, args=(ip,
                              ctx.obj['conn']['username'],
                              ctx.obj['conn']['password'],
                              wrap.pull, [source, destination, progress, multi],
                              ctx.obj['out'],
                              ctx.obj['conn']['connect_timeout'],
                              ctx.obj['conn']['session_timeout'],
                              ctx.obj['conn']['port']), callback=write_out)
      mp_pool.close()
      mp_pool.join()
docs: Copy file(s) from device(s) -> local machine.
  
      @param ctx: The click context paramter, for receiving the object dictionary
                | being manipulated by other previous functions. Needed by any
                | function with the @click.pass_context decorator.
      @type ctx: click.Context
      @param source: the source filepath or dirpath
      @type source: str
      @param destination: the destination filepath or dirpath
      @type destination: str
      @param progress: bool set to True if we should request a progress callback
                     | from the Jaide object. Always set to False when
                     | we're copying to/from multiple devices.
      @type progress: bool
  
      @returns: None. Functions part of click relating to the command group
              | 'main' do not return anything. Click handles passing context
              | between the functions and maintaing command order and chaining.