Java abstract class and interface and their difference.
Extract the i-th digit of any integers, where i starts from right to left.
Introduction to html div and span elements and their differences.
Python source code encoding and unicode in 2.x.
Three kinds of css placement in HTML.
if __name__ == '__main__'does in python and practice of defining
python main functions.
Python function standard arguments, positional arguments, and keyword arguments.
Selenium web element locating strategy using xpath.
Python AOP (aspect oriented programming) with decorators.
Selenium web element locating strategy using css selector.