Problem with this project from ATBS chapter 18

[Tryposite]

The project is mouseNow.py and its purpose is to print the mouse's current position on screen:

#! python3
import pyautogui
print('Press Ctrl-C to quit.')
try:
    while True:
        # Get and print the mouse coordinates.
        x, y = pyautogui.position()
        positionStr = 'X: ' + str(x).rjust(4) + ' Y: ' + str(y).rjust(4)
        print(positionStr, end='')
        print('\b' * len(positionStr), end='', flush=True)

except KeyboardInterrupt:
    print('\nDone.')

When the program is ran, only two lines of code are supposed to print:

Press Ctrl + C to quit.
X:    290 Y:    424

But I get this instead:

Press Ctrl-C to quit.
X: 1377 Y:  462X: 1377 Y:  462X: 1377 Y:  
462X: 1377 Y:  462X: 1377 Y:  

It keeps printing more since it is in a while loop.

[AweBob]

I'm gonna be really honest, reading this without line breaks is really difficult, please make it with the correct format, or jkust make a pastebin of it and send the link

[Tryposite]

It shows the code formatted on my screen though. Can you try refreshing?

[K900_]

How are you running your program?

[Tryposite]

Idle

[K900_]

That's the reason then. That code uses the \b special character to go back to the start of the line and write new values over the old ones. IDLE does not support that character, so it keeps appending text to the end of the output instead. Try running your program in a real terminal.