font_test.py

import toga

class StartApp(toga.App):
    def startup(self):
        self.main_window = toga.MainWindow(self.name)
        self.main_window.app = self

        right_box = toga.Box()
        left_box = toga.Box()

        test_status_font = toga.Font(family='Helvetica', size=50)

        test_status = toga.Label('Font test')
        test_status.set_font(test_status_font)
        # test_status.rehint()

        right_box.add(test_status)

        split_main_container = toga.SplitContainer()
        split_main_container.content = [left_box, right_box]

        self.main_window.content = split_main_container
        self.main_window.show()

def main():
    app = StartApp('Font Test', 'org.pybee.test')
    app.main_loop()

if __name__ == '__main__':
    main()