Comment 3 for bug 1132812

Because screenlets are written in python end user gets copy of source code and not precompiled binary, which means that you
can change installed files directly (not recommended) or get a copy of source code from tarball and change that.
For example if you want to change sensors.py:
1. download source
2. make changes in SOURCE_PATH/src/lib/sensors.py
3. go to SOURCE_PATH and execute "python setup.py build"
4. run "export PYTHONPATH=SOURCE_PATH/build/lib.linux-x86*/screenlets/" where lib.linux-x86* is folder generated by command above. (it will be for ex. lib.linux-x86_64-2.6, it depends on arch)
5. run desired screenlet and test your changes

It's important to run step 4 and 5 in same terminal because otherwise python will import your installed modules and not those that you have just changed.

When you make a patch which you want to be permanent, execute "sudo setup.py install" in SOURCE_PATH folder. Also, when you do that, post patch upstream ;)

Regards,
Rastko Karadzic.