simple spinner

spinner.py

import itertools
import sys
import threading
import time


class Signal:
    stop = False


def spin(msg, signal):
    write, flush = sys.stdout.write, sys.stdout.flush
    for char in itertools.cycle('|/-\\'):
        status = char + ' ' + msg
        write(status)
        flush()
        write('\b' * len(status))
        time.sleep(0.1)

        if signal.stop:
            break
    write(' ' * len(status) + '\b' * len(status))


def main():
    signal = Signal()

    spinner = threading.Thread(target=spin, args=('Hi', signal))

    spinner.start()

    time.sleep(3)

    signal.stop = True


if __name__ == '__main__':
    main()