Python error “ImportError: No module named”

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Python is installed in a local directory.

My directory tree looks like this:

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

My code is in here:

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

To run the example, I write python mountain.py, and in the code I have:

from toolkit.interface import interface

And I get the error:

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

I have already checked sys.path and there I have the directory /site-packages. Also, I have the file __init__.py.bin in the toolkit folder to indicate to Python that this is a package. I also have a __init__.py.bin in the examples directory.

I do not know why Python cannot find the file when it is in sys.path. Any ideas? Can it be a permissions problem? Do I need some execution permission?

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