Ah, I can see now that `map` will return a list of Nones, and also that Py3 `map` returns a lazy iterator. Thanks. Seeing how my transition to Py3 got hung up

Ah, I can see now that `map` will return a list of Nones, and also that Py3 `map` returns a lazy iterator. Thanks. Seeing how my transition to Py3 got hung up on sending bytes in and out of ZeroMQ sockets, I might stop that now. Back to the for loop or join the strings as suggested below.