Looking for Python Finite State Machine Implementations

[Leonard J. Reder]

Hello,

Although posted this a few weeks ago I still have gotten much feedback 
so I want to put this out again and see if the response gets a bit more 
interesting.

I have been searching on the web for a while now for a specific Python 
implementation of an FSM.  More specifically what I am looking
for is a Python implementation of the so called UML Harel State Machine
notion of a state machine.  These are multi-threaded capable state
machines with hierarchical representation capability (nested
instances of state machines).  They also have a unique conditional 
trigger symbol scheme for event representation and state machine 
transitions.

I have seen some great implementations of simple FSMs and some 
interesting descriptions of how generator/yeild python keywords can be 
used.  I think python has all the pieces to make a Heral implementation.

Does anyone know of a Python implementation of FSM that comes close to 
this functionality?  Any comments or recommendation for FSM packages 
that I could add this functionality to would also be welcome.  I 
certainly think someone has done something that approaches this already.

All replies are very much appreciated.  If I get enough response I will 
post a summary of findings to this group.

Thanks for reading this and any replies.

Regards,
Len

-- 
____________________________________________________
Leonard J. Reder
Jet Propulsion Laboratory
Interferometry Systems and Technology Section 383
Email: reder at huey.jpl.nasa.gov
Phone (Voice): 818-354-3639
Phone (FAX): 818-354-4357
Mail Address:
Mail Stop: 171-113
4800 Oak Grove Dr.
Pasadena, CA. 91109
---------------------------------------------------