Find out what every row of code does. For example by changing the code a bit and running it again. Pay special attention to how the scrollbar is placed right beside the treeview. # Create a data table ...

This combination leads you to choose from the following alternatives for Python GUI development: wxPython, Tkinter, pyGTK and Python/Qt. Keeping in mind that I am not a professional GUI developer, ...

Find out what every row of code does. For example by changing the code a bit and running it again. Pay special attention to the options of treeview columns and columns headings. Play around with them.