def wrappertask(task):
 @six.wraps(task)
 def wrapper(*args, **kwargs):
  parent = task(*args, **kwargs)
  try:
   subtask = next(parent)
  except StopIteration:
   return
  while True:
   try:
    if isinstance(subtask, types.GeneratorType):
     subtask_running = True
     try:
      step = next(subtask)
     except StopIteration:
      subtask_running = False
     while subtask_running:
      try:
       (yield step)
      except GeneratorExit:
       subtask.close()
       raise
      except:
       try:
        step = subtask.throw(*sys.exc_info())
       except StopIteration:
        subtask_running = False
      else:
       try:
        step = next(subtask)
       except StopIteration:
        subtask_running = False
    else:
     (yield subtask)
   except GeneratorExit:
    parent.close()
    raise
   except:
    try:
     subtask = parent.throw(*sys.exc_info())
    except StopIteration:
     return
   else:
    try:
     subtask = next(parent)
    except StopIteration:
     return
 return wrapper

def wrappertask ( task ) : @ six . wraps ( task ) def wrapper ( * args , ** kwargs ) : parent = task ( * args , ** kwargs ) try : subtask = next ( parent ) except StopIteration : return while True : try : if isinstance ( subtask , types . GeneratorType ) : subtask_running = True try : step = next ( subtask ) except StopIteration : subtask_running = False while subtask_running : try : ( yield step ) except GeneratorExit : subtask . close ( ) raise except : try : step = subtask . throw ( * sys . exc_info ( ) ) except StopIteration : subtask_running = False else : try : step = next ( subtask ) except StopIteration : subtask_running = False else : ( yield subtask ) except GeneratorExit : parent . close ( ) raise except : try : subtask = parent . throw ( * sys . exc_info ( ) ) except StopIteration : return else : try : subtask = next ( parent ) except StopIteration : return return wrapper
decorator for a task that needs to drive a subtask .