#! python3
# P2_mouseNow.py - Displays the mouse cursor's current position.
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.')

#! python3
"""Mouse now

Displays the mouse cursor's current position in terminal.

"""


def main():
    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.')


if __name__ == '__main__':
    main()

Update P2_mouseNow.py added docstring and wrapped in main function