Extensions
There are lots of things we could do now that we have a basic working GUI. Here are a few possible ideas:
Adding buttons to zoom in or out
Adding a textbox and button to update the location
Adding a way to select different styles of map marker
Selecting whether the map is a satellite image or a road map
Saving and loading the map settings (the location, position of markers, labels, and so on)
Allowing markers and their labels to be changed after they have been created
Complete details on how to use Tkinter can be found online at https://wiki.python.org/moin/TkInter.
Layout
In this chapter, we have used only the pack layout, but there are also other ways to tell Python where you want your widgets to be displayed.
The pack layout is useful to fill the screen with a single widget (similar to our map) or to place widgets in a line (similar to our window when we type in label names).
The grid layout allows us to line up widgets both vertically and horizontally. All the widgets that we put in...
