Visualize your Python code while you type it in PyCharm, Emacs, Sublime Text, or even your browser. Live coding tightens the feedback loop between making a change to your code and seeing the behaviour ...
Unzip to a folder. Right-click this link --> parser.py <-- and select "Save Link as", and save into the folder where you extracted the archive. (Or use wget or curl on that link. Or clone the git repo ...