Simon python tracing how to

====== Insert stop point ======
Insert this into the code:

import pdb; pdb.set_trace()

====== Interactive daemon ======
To get to interactive shell, run the daemon that runs into the debug code in the foreground or with high verbosity:
zopectl stop;zopectl fg
zenhub stop;zenhub run -v 10
zenmodeler stop;zenmodeler run -v 10

====== Commands ======
      l - list code
      n - execute next line