$ google_appengine/dev_appserver.py google_appengine/demos/guestbook/
Traceback (most recent call last):
  File "google_appengine/dev_appserver.py", line 60, in <module>
    run_file(__file__, globals())
  File "google_appengine/dev_appserver.py", line 57, in run_file
    execfile(script_path, globals_)
  File "/home/sevkin/src/gae/google_appengine/google/appengine/tools/dev_appserver_main.py", line 463, in <module>
    sys.exit(main(sys.argv))
  File "/home/sevkin/src/gae/google_appengine/google/appengine/tools/dev_appserver_main.py", line 385, in main
    SetGlobals()
  File "/home/sevkin/src/gae/google_appengine/google/appengine/tools/dev_appserver_main.py", line 81, in SetGlobals
    from google.appengine.tools import appcfg
  File "/home/sevkin/src/gae/google_appengine/appcfg.py", line 54, in <module>
    script_name = os.path.basename(file_path)
  File "/home/sevkin/src/gae/google_appengine_1.1.9/google/appengine/datastore/datastore_index.py", line 52, in <module>
  File "/home/sevkin/src/gae/google_appengine_1.1.9/google/appengine/api/datastore_types.py", line 46, in <module>
ImportError: No module named sax