Here are some mappings for the python funtionality provided by eclim. To make use of these mappings, simply create a ftplugin file for python and place your mappings there (:help ftplugin-name).
The following mapping allows you to simply hit <enter> on an element to perform a search to find its definition or occurrences depending on the context.
nnoremap <silent> <buffer> <cr> :PythonSearchContext<cr>
If you are doing django development you may want to use the following mapping instead which also supports locating django templates when executed over a quoted template path in a view, or locating django views when executed on a quoted view name in a urls.py file.
nnoremap <silent> <buffer> <cr> :DjangoContextOpen<cr>