Sorry, but to my understanding that's not even close to Erlang's code hot-swapping. In Erlang one could easily update any module, and re-importing modules is q

Sorry, but to my understanding that's not even close to Erlang's code hot-swapping. In Erlang one could easily update any module, and re-importing modules is quite complicated in Python. Update will be seamless, too - old code will be running its last reductions (so already connected clients won't experience downtime) while new messages will be processed with a new code. Surely, it is possible to achieve the same in Python, but that'd require a lot more code than monkey-patching several values.