This is the code that served as the original prototype for today's IPython client/server model. It is kept here purely as a reference to illustrate how to implement similar ideas for interactive Python interpreters on top of zeromq. This example used to be included with pyzmq but for some reason was removed, so it's available here in standalone form. It should be useful to anyone wishing to either implement a similar system or understand IPython's basic architecture without all of the details.
The message spec included here was the original, minimal spec we used for this implementation, today's IPython messaging is based on these ideas but has evolved substantially.
Run in one terminal:
./kernel.pyand in another:
./frontend.pyIn the latter, you can type python code, tab-complete, etc. The kernel terminal prints all messages for debugging. Exit the frontend with Ctrl-D, and the kernel with Ctrl-(note that Ctrl-C will not stop the kernel).
This code is released under the terms of the BSD license, same as IPython itself. It was originally authored by Brian Granger and Fernando Perez, but no further development is planned, as all the ideas illustrated here are now implemented in IPython and developed there as production code.