无法使用cqlengine python模型从cassandra获取数据：

Question

我正在尝试使用cassandrapython cqlengine来访问cassandra数据库，当列不是列表类型时，我能够进行过滤。

我得到以下错误消息：

d =cClass().filter(lastname='text',age=2,input__contains='a') 

Traceback (most recent call last):   
File "/usr/local/lib/python3.4/dist-packages/cqlengine-0.21.0-py3.4.egg/cqlengine/operators.py", line 43, 
    in get_operator KeyError: 'CONTAINS'  During handling of the above exception, another exception occurred:  
Traceback (most recent call last):   
File "<stdin>", line 1, in <module>   
File "/usr/local/lib/python3.4/dist-packages/cqlengine-0.21.0-py3.4.egg/cqlengine/models.py", line 562, in filter   
File "/usr/local/lib/python3.4/dist-packages/cqlengine-0.21.0-py3.4.egg/cqlengine/query.py", line 507, in filter   
File "/usr/local/lib/python3.4/dist-packages/cqlengine-0.21.0-py3.4.egg/cqlengine/operators.py", line 45, 
    in get_operator **cqlengine.operators.QueryOperatorException: contains doesn't map to a QueryOperator**

Answer 1

看起来您使用的是cqlengine的一个非常旧的(和不推荐使用的)版本。如果可以，请升级到接口支持contains since version 3.1.0的集成版本。