Give it a .nessus file and it'll get you Metasploit shells. I've included the early and incomplete programs to make it easier for people who want to learn how to use the python-libnessus and msfrpc libraries.

• msf-autoshell-boilerplate.py was the first step; a simple boilerplate program with some boring stuff filled out.
• msf-autoshell-parse-nessus.py was the next step and all it does is parse the .nessus file and grab some info off the parsed objects.
• msf-autoshell-msfrpc-connect.py shows how to connect to the Metasploit RPC server and some examples of interacting with it.
• Finally, msf-autoshell.py is the final script with all the Metasploit logic code for running modules in it.

This install is only tested on Kali.

git clone https://github.com/DanMcInerney/msf-autoshell
cd msf-autoshell
pipenv install --three
pipenv shell

In a new terminal: 
> msfconsole
msf > load msgrpc Pass=123

python msf-autoshell.py -n /path/to/nessus/file.nessus

Thanks to Coalfire for some development time.