答：Disconnecting will close all underlying sockets in the connection pool. If this instance is used again it will be automatically re-opened.
转自：http://stackoverflow.com/questions/18401015/how-to-close-a-mongodb-python-connection
http://stackoverflow.com/questions/20613339/close-never-close-connections-in-pymongo
使用pymongo需要手动关闭MongoDB Connection吗？
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