無法遍歷Python中的字典列表

Question

我有一個命令如下：

{   u'has_more': False,
    u'is_limited': True,
    u'latest': u'1501149118.071555',
    u'messages': [   {   u'text': u'--Sharp 1.9 DM\n--Modifying and testing DM script for bypassing existing sonumber validation and add line items',
                         u'ts': u'1501149054.047400',
                         u'type': u'message',
                         u'user': u'U0HN06ZB9'},
                     {   u'text': u'-- support to engineering on Licensing infra upgrade to 3.6\n   - created a new key for qa on current 3.5 ubuntu 12 instance\n   - added that key to the instance , created the ami and shared it with QA\n   - short discussion with Navin on same',
                         u'ts': u'1501148934.002719',
                         u'type': u'message',
                         u'user': u'U02RRQJG1'},
                     {   u'inviter': u'U03FE3Z7D',
                         u'subtype': u'channel_join',
                         u'text': u'<@U0HN06ZB9|shikhar.rastogi> has joined the channel',
                         u'ts': u'1501148921.998107',
                         u'type': u'message',
                         u'user': u'U0HN06ZB9'},
                     {   u'inviter': u'U03FE3Z7D',
                         u'subtype': u'channel_join',
                         u'text': u'<@U02RRQJG1|himani> has joined the channel',
                         u'ts': u'1501148328.777625',
                         u'type': u'message',
                         u'user': u'U02RRQJG1'},
                     {   u'text': u'something like ^^^^',
                         u'ts': u'1501148318.773838',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'text': u'-- This is test \n-- Not\n-- test1\n-- Test b',
                         u'ts': u'1501148309.770614',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'text': u'<!channel>  can all of you start putting some random crap in same format as shift handoff',
                         u'ts': u'1501148287.762336',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'text': u'<!channel>  can all of you start putting some random crap in same format as shift handoff',
                         u'ts': u'1501148287.762161',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'text': u'sjvnsv',
                         u'ts': u'1501138569.469475',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'text': u'-- Test1 \n-- Leave this ASAP',
                         u'ts': u'1501136157.933720',
                         u'type': u'message',
                         u'user': u'U03FE3Z7D'},
                     {   u'bot_id': u'B19LZG1A5',
                         u'subtype': u'bot_message',
                         u'text': u'This is crazy',
                         u'ts': u'1501075281.418010',
                         u'type': u'message',
                         u'username': u'TEST_BOT'}],
    u'ok': True,
    u'oldest': u'1500820472.964970'}

現在，我嘗試提取2件事，第一件事是user及其對應的text ，但是不知何故我無法使用以下命令獲取它：

json_objects = json.loads(r.text)
for i in json_objects:
    print json_objects['messages'][i]['user']
    print json_objects['messages'][i]['text']

上面拋出一個錯誤：

Traceback (most recent call last):
  File "clean_test.py", line 45, in <module>
    get_channel_messages()
  File "clean_test.py", line 38, in get_channel_messages
    print json_objects['messages'][i]['user']
TypeError: list indices must be integers, not unicode

上面的代碼實際上應該獲取user並調用user_detail（）來獲取名稱並返回，一旦完成，我希望以以下方式將內容轉儲到文件中

username1:
    -- text
username2:
    -- text2

Answer 1

您要遍歷列表的索引，而不要遍歷外部dict的鍵

json_objects = json.loads(r.text)
for i in range(len(json_objects['messages'])):
    print json_objects['messages'][i]['user']
    print json_objects['messages'][i]['text']

或者另一種方式是（Pythonic方式）：

for i in json_objects['messages']:
   print i['user']
   print i['text']

Answer 2

您正在字典中嘗試訪問列表。 試試這個

for i in json_objects['messages']:
    print i['user']
    print i['text']