Ned Batchelder. Blog - http://nedbatchelder.com/ Stack Overflow answers - http://stackoverflow.com/users/14343/ned-batchelder Coverage.py - https://github.com/nedbat/coveragepy Twitter - https://twitter.com/nedbat

Ned created coverage.py and is one of the most famous Python devs. He explains Python concepts in a very lucid, easy-to-understand way. Going through his stack overflow answers, his tallks in PyCon are worth doing it.