Models and views in PyQt

The model-view pattern is not only useful in the design of large applications, but also on a smaller scale with widgets that contain data. Copy the application template from Chapter 4, Building Applications with QMainWindow, and let's look at a simple example of how model-view works on the widget level.

In the MainWindow class, create a list of items and add them to both the QListWidget and QComboBox objects:

    data = [
      'Hamburger', 'Cheeseburger',
      'Chicken Nuggets', 'Hot Dog', 'Fish Sandwich'
    ]
    # The list widget
    listwidget = qtw.QListWidget()
    listwidget.addItems(data)
    # The combobox
    combobox = qtw.QComboBox()
    combobox.addItems(data)
    self.layout().addWidget(listwidget)
    self.layout().addWidget(combobox)

Because both widgets were initialized with the same list...