He has been a researcher about speech signal processing but, frankly speaking, not very good at programming for years. Since 2011, he retrained himself, and regained the programming skills by finding Python, the awesome programming language. Now, he used Python not only as a "programming" language, but also as a "language" to read, to write, to learn and to teach. He loved Python 3 more than Python 2, because Python 3 is his native Python.