Steve D'Aprano wrote:
- Greg's dict comprehension version requires N+1 passes through the data, one to convert to a list, and 1 per each possible key.
Just to be clear, my solution was a response to the requirement that it be written in a purely functional style. It's not now I would actually recommend doing it! While a purely functional single-pass solution is possible, in Python it would probably be just as inefficient, maybe even worse. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
