Here a small collection:

- https://github.com/nemonik/Intellect (Dead - 2017)

- https://github.com/jruizgit/rules (dead)

- https://github.com/cmaclell/py_rete (dead)

- https://github.com/nilp0inter/experta (dead)

- https://github.com/GNaive/naive-rete (dead)

(All of them are rule engine - I guess they implement the Rete algo or some variant but no time to check ATM).

Also: "production" is probably false since all of them are dead (or were, last time I checked - I'd be happy to be proven wrong).