spinner.py

import sys
import time
import itertools

def spinning_cursor():
    while True:
        for cursor in '|/-\\':
            yield cursor

#spinner = spinning_cursor()
spinner = itertools.cycle(['-','/','|','\\'])
for _ in range(50):
    sys.stdout.write(next(spinner))
    sys.stdout.flush()
    time.sleep(0.1)
    sys.stdout.write('\b')