python ImportError No module named

Traceback (most recent call last):
  File "mountain.py", line 28, in ?
    from toolkit.interface import interface
ImportError: No module named toolkit.interface

(local directory)/site-packages/toolkit/interface.py

(local directory)/site-packages/toolkit/examples/mountain.py

from toolkit.interface import interface

(local directory)/site-packages/toolkit

.:/usr/local/lib/python