Question

我刚刚通过pymongo==3.0.3升级到pip install --upgrade pymongo，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更改

MongoClient现在是独立服务器，mongos或副本集的唯一客户端类。它包括已拆分为MongoReplicaSetClient的功能：它可以连接到副本集，发现其所有成员，并监视该组以进行降级，选举和重新配置。 MongoClient现在也支持完整的ReadPreference API。

删除了过时的类MasterSlaveConnection，Connection和ReplicaSetConnection。

如您所见，已从pymonge 3.0中删除Connection类，请尝试使用MongoClient。有关mongoclient的信息可以在here

找到

Answer 2

您可以通过执行此类操作来支持代码中的两个版本。

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

Answer 3

由于pymongo（3.0.0）不推荐使用Connection类。安装较旧版本的pymongo（2.9）使其临时工作。可以使用以下方法通过pip完成：

pip install  pymongo==2.9

pymongo == 3.0.3：ImportError：没有名为connection的模块

3 个答案: