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There is a tutorial on that here: http://www.ros.org/wiki/rospy_tutorials/Tutorials/Makefile (click catkin) Section 2.2

Also some more info here: http://ros.org/doc/groovy/api/catkin/html/user_guide/setup_dot_py.html

Note that catkin does not put your my_package.py in the devel space, it uses the one in your source space via some python voodoo, so in your devel space you will just get some __init__.py.