pymongo==3.0.3: ImportError: No module named connection

Question

我刚刚通过 pip install --upgrade pymongo 升级到 pymongo==3.0.3，我被 ImportError:

淹没了

In [2]: pymongo.version
Out[2]: '3.0.3'

In [3]: from pymongo import Connection
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-3-dd44bc3249d3> in <module>()
----> 1 from pymongo import Connection

ImportError: cannot import name Connection

In [4]: from pymongo import connection
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-4-71c9e4ec1bcd> in <module>()
----> 1 from pymongo import connection

ImportError: cannot import name connection

In [5]: import pymongo.connection.Connection
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-5-282b89157c85> in <module>()
----> 1 import pymongo.connection.Connection

ImportError: No module named connection.Connection

Answer 1

根据Pymongo 3.0 changelog-

MongoClient changes

MongoClient is now the one and only client class for a standalone server, mongos, or replica set. It includes the functionality that had been split into MongoReplicaSetClient: it can connect to a replica set, discover all its members, and monitor the set for stepdowns, elections, and reconfigs. MongoClient now also supports the full ReadPreference API.

The obsolete classes MasterSlaveConnection, Connection, and ReplicaSetConnection are removed.

如您所见，Connection class 已从 pymonge 3.0 中删除，请尝试改用 MongoClient。关于mongoclient的信息可以参考here

Answer 2

也许您可以通过执行类似操作在您的代码中支持这两个版本。

try:
    from pymongo.connection import Connection
except ImportError as e:
    from pymongo import MongoClient as Connection

Answer 3

因为 Connection class 已从 pymongo(3.0.0) 中弃用。安装旧版本的 pymongo(2.9) 使其暂时可用。可以使用 pip 来完成：

pip install  pymongo==2.9

pymongo==3.0.3: ImportError: No module named connection

pymongo==3.0.3: ImportError: No module named connection

python

pymongo

pymongo-3.x