Traceback (most recent call last):
  File "/usr/bin/koan", line 18, in <module>
    import koan.app as app
  File "/usr/lib/python2.7/dist-packages/koan/app.py", line 65, in <module>
    import configurator
  File "/usr/lib/python2.7/dist-packages/koan/configurator.py", line 34, in <module>
    import yum
ImportError: No module named yum