newbie question: how to run a python file if it is in a package

[neoedmund]

On Sep 5, 8:12 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> neoedmund schrieb:
>
> > for example:
>
> > X.py is in aaa.bbb and it has a line like "import aaa.bbb.Y"
> > how can I run X.py avoiding it saying such like "ImportError: No
> > module named aaa.bbb"?
>
> > Is all runnable script must be in the default package?
>
> There is no such thing as a "default package"
>
> All imports are resolved over the "sys.path" list of directories (or eggs).
>
> There are various ways to modify this:
>
>   - by hand. If you know X.py lives below aaa/bbb, you can get it's
>     __file__-attribute, and walk the way down two levels. Then add the
>     resulting path to sys.path. All this has to be done before any
>     import of aaa.bbb occurs.
>
>   - modify the environment variable PYTHONPATH to contain the root of
>     aaa.bbb before starting the script.
>
>   - write a custom .pth-file and place it into your pythno installation.
>     The pth-file will contain the above mentioned root path.
>
>   - use setuptools to create script entry-points, and install your whole
>     application either fully, or as so-called egg-link. Possibly inside
>     a virtualenv. This would be my personally preferred method.
>
>   - simply copy your wohe aaa.bbb-stuff into site-packages. Make sure you
>     do that whenever you change something in your code.
>
> Diez

thanks Diez, i think your answer is almost perfect.