I am using intellij IDEA version 11.1.5 on windows and python plugin version is 2.9.2 
I am using grinder maven plugin to run the performance tests using grinder. It only supports python(Jython) to run tests. I am not getting any auto suggestions for the python development even though I have installed the python plugin. Python files are also getting displayed as a text files.
Is there any other configuration to enable the auto suggestions for python development?
Your file types are not configured correctly, .py is most likely assigned to Text files instead of Python files, you can fix it in File | Settings | File Types.
There is no support for tests running via Maven, but you can create your own Run/Debug configuration for Python unit tests in IDEA.
Python support for maven module in intellij