[PyQt] Introduction tutorial to PyQT4

[Zhengpeng Hou]

http://paul.giannaros.org/pykhtml/
A Python module for writing website scrapers/spiders. Whereas
traditional methods focus on writing the code to parse HTML/forms
themselves, PyKHTML uses the excellent KHTML engine to do all the
trudge work. It therefore handles webpages very well (even the
severely crufty ones) and is pretty darn fast (implemented in C++). As
a bonus the module handles JavaScript and cookies transparently.
Hurrah!