Python TypeError: 'NoneType' object is not iterable but every variables defined

Question

我正在尝试构建一个连接到 slack 的机器人，并不断收到 TypeError:

Traceback (most recent call last):
  File "happybotV4.2.py", line 217, in <module>
    av_mood, user_count, total_mood = datamood(user_answer, user_id, user_count, total_mood, av_mood)
TypeError: 'NoneType' object is not iterable

代码如下：

if slackinput_list and len(slackinput_list) > 0:
  user_answer, user_id, channel, event_type = parse_slack_useranswer(slackinput_list)
  #print(user_answer,user_id)#test
  if user_answer and user_id and user_id != 'U7GRT34H3' and event_type=="message":
    if user_answer=="1" or user_answer=="5":
      print(user_answer, user_id, user_count, total_mood, av_mood) #test
      #if user_id not in user_list:
      av_mood, user_count, total_mood = datamood(user_answer, user_id, user_count, total_mood, av_mood)

和datamood的代码：

def datamood(mood, user, count, total_mood, average_mood):
  print(user_list)
  if user not in user_list:
    count = count+1
    mood_user.append(mood)
    user_list.append(user)
    print(user_list, user)
    if len(mood_user)>0:
      for i in mood_user :
        if i=="1":
          n=1
        elif i=="5":
          n=5

        total_mood = total_mood + n
        print(total_mood)#test
      average_mood = total_mood/count
      print (average_mood, count) #test
      return average_mood, count, total_mood
    else:
      return average_mood, count, total_mood

事实上 datamood 工作了一次，但是当我第二次尝试调用它时，我得到了错误。我检查了每个变量（即 user_answer、user_id、user_count、total_mood、av_mood）都不是 None 并且是正确的格式。

有什么想法吗？

Answer 1

您对 datamood() 方法的调用需要一个值 returned。由于您的逻辑没有明确告诉您的方法当 user 存在于 user_list 方法 returns None 或 NoneType 对象中时该怎么做。当 return 未在 Python 方法中显式设置时，它将始终 return None。因此，当您第一次调用该方法并且 user 不存在时，需要 return 值；但是，当您调用该方法并且 user 确实存在时，您的方法 returns None.

Python TypeError: 'NoneType' object is not iterable but every variables defined

Python TypeError: 'NoneType' object is not iterable but every variables defined

python

python-2.7

python-3.x

slack-api