tkinter loop

__main__.py

#!/usr/bin/env python3
"""Show how to implement a loop using tkinter."""
import itertools
import tkinter


def loop(widget, delay_ms=300, chars=itertools.cycle('\-/|')):
    print(next(chars), end='\r', flush=True)
    widget.after(delay_ms, loop, widget, delay_ms)

root = tkinter.Tk()
root.withdraw()  # hide GUI
root.after_idle(loop, root)  # start loop
root.after(5000, root.destroy)  # quit in 5 seconds
root.mainloop()
print('done')