<p>我试图在查询我的mongoDB时使用排序功能,但它失败了。同样的查询在MongoDB控制台中有效,但在这里不行。代码如下:</p>
<pre><code>import pymongo
from pymongo import Connection
connection = Connection()
db = connection.myDB
print db.posts.count()
for post in db.posts.find({}, {'entities.user_mentions.screen_name':1}).sort({u'entities.user_mentions.screen_name':1}):
print post
</code></pre>
<p>我得到的错误如下:</p>
<pre><code>Traceback (most recent call last):
File "find_ow.py", line 7, in <module>
for post in db.posts.find({}, {'entities.user_mentions.screen_name':1}).sort({'entities.user_mentions.screen_name':1},1):
File "/Library/Python/2.6/site-packages/pymongo-2.0.1-py2.6-macosx-10.6-universal.egg/pymongo/cursor.py", line 430, in sort
File "/Library/Python/2.6/site-packages/pymongo-2.0.1-py2.6-macosx-10.6-universal.egg/pymongo/helpers.py", line 67, in _index_document
TypeError: first item in each key pair must be a string
</code></pre>
<p>我在其他地方找到了一个链接,上面说如果使用pymongo,我需要在密钥前面加一个“u”,但这也不起作用。任何人都能让这个工作,或者这是个错误。</p>