[Python] Autobahn cannot import name error

I have installed twisted and Autobahn websocket by using

pip install twisted
pip install autobahn


But when I import any of the factories from Autobahn, I get the cannot import name error.

>>> from twisted.internet import reactor
>>> from autobahn.websocket import WebSocketClientFactory
Traceback (most recent call last):
File "<console>", line 1, in <module>
ImportError: cannot import name WebSocketClientFactory


Is there anything I am missing? Here's the pip freeze

Twisted==13.2.0
Twisted-Core==12.3.0
Twisted-Names==12.3.0
Twisted-Web==12.3.0
autobahn==0.7.4
websocket==0.2.1
websocket-client==0.13.0

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