Allow automatic attachment to existing Python process

[guibor]

I often find myself using lpy with a Python process already running.
Using lpy indirectly uses le-python.el and I often find it spawning a new Python process (lispy-python-default).
I made a few attempts to add a hook that attaches the buffer to an existing process, but they seem to be flaky at best. Perhaps ideally this would be incorporated as a customization of lispy (and lpy).

[guibor]

Is this possible?