Import error while import pcaspy

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What steps will reproduce the problem?
1. Install pcaspy (under sudo) in linux via pip install pcaspy
2. python -c "import pcaspy"

What is the expected output? What do you see instead?

The output is

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib64/python2.6/site-packages/pcaspy/__init__.py", line 1, in <module>
    from driver import Driver, SimpleServer, PVInfo, SimplePV
  File "/usr/lib64/python2.6/site-packages/pcaspy/driver.py", line 1, in <module>
    import cas
ImportError: No module named cas


What version of the product are you using? On what operating system?

0.5 

Please provide any additional information below.

Original issue reported on code.google.com by zunbe...@gmail.com on 3 Oct 2014 at 11:33