Building the broad GUI structure

We start as usual by building the root window (7.01/view.py):

root = Tk()
SCREEN_WIDTH = root.winfo_screenwidth()
SCREEN_HEIGHT = root.winfo_screenheight()
SCREEN_X_CENTER = (SCREEN_WIDTH - WINDOW_WIDTH) / 2
SCREEN_Y_CENTER = (SCREEN_HEIGHT - WINDOW_HEIGHT) / 2
root.geometry('%dx%d+%d+%d' % (WINDOW_WIDTH, WINDOW_HEIGHT, SCREEN_X_CENTER,  SCREEN_Y_CENTER))
root.resizable(False, False)
PianoTutor(root)
root.mainloop()

We also create a new file named constants.py( 7.01), which currently holds the height parameters for the window.

We use two root window methods,  root.winfo_screenwidth()and root_winfo_screenheight(), to obtain the screen width and height, respectively. We define two constants,  WINDOW_WIDTH and WINDOW_HEIGHT, and then place the window on the x, y center of the computer screen.

Notice the line root.resizable(False, False). This root window method takes two Boolean arguments to decide if the window is resizable in the x and y directions.  Setting both...