pylint -> ImportError: No module named lazy_object_proxy

[Michael Ströder]

HI!

Hmm, I've used pylint before but my current installation gives me an ImportError:

$ pylint
Traceback (most recent call last):
  File "/usr/bin/pylint", line 3, in <module>
    run_pylint()
  File "/usr/lib/python2.7/site-packages/pylint/__init__.py", line 22, in run_pylint
    from pylint.lint import Run
  File "/usr/lib/python2.7/site-packages/pylint/lint.py", line 44, in <module>
    import astroid
  File "/usr/lib/python2.7/site-packages/astroid/__init__.py", line 54, in <module>
    from astroid.nodes import *
  File "/usr/lib/python2.7/site-packages/astroid/nodes.py", line 39, in <module>
    from astroid.node_classes import (
  File "/usr/lib/python2.7/site-packages/astroid/node_classes.py", line 24, in
<module>
    import lazy_object_proxy
ImportError: No module named lazy_object_proxy

Can anybody here give me a hint what's missing?
six, astroid and tk modules are installed.
Any more dependencies?

Ciao, Michael.