Recursive Functional State Machine

https://code.activestate.com/recipes/577709-recursive-functional-state-machine/?in=lang-python

Here is a pure Python FSM

https://github.com/oxplot/fysom/blob/master/fysom.py

Sending Email From A Python Program (Python recipe)

https://code.activestate.com/recipes/578807-sending-email-from-a-python-program/?in=lang-python

Raymon Hettinger Tips

https://code.activestate.com/recipes/users/178123/