I have started a Python module which should include functions specifically for work with libRadtran: libradtran.py
In order to use these functions you can either copy the file to your working directory or set the environment variable PYTHONPATH to the path were you want to put your own python functions.
Then you just type
from libradtran import *
and you can use all functions defined in the file libradtran.py.
So far it includes only a function to read radiances from the standard libRadtran output. Try
help(read_librad_radiances)
to see how it works.