It's good practice to list imports in the following order:

1. python core libraries
2. 3rd party libraries you are using
3. libraries from your own project you are importing.

(Also in alphabetical order)

Also put a single new line between sets 1, 2, 3. For example take a look at:
    https://github.com/Freeseer/freeseer/blob/experimental/src/freeseer/frontend/configtool/configtool.py#L25