>>> import clj
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.3/site-packages/clj.py", line 47, in <module>
from cStringIO import StringIO
ImportError: No module named 'cStringIO'
Yes, currently pyclj is not fully compatible with python 3.x. The master branch and current releases are only working with python 2.x
I have an unstable branch for python 3.x which you can checkout.