# a simple progress bar

import time
import sys

progressbar_width = 40

sys.stdout.write("[%s]" % (" " * progressbar_width))
sys.stdout.flush()
sys.stdout.write("\b" * (progressbar_width + 1))  # return to start of line, after '['

for i in range(progressbar_width):
    time.sleep(0.1)
    sys.stdout.write("-")
    sys.stdout.flush()

sys.stdout.write("]\n")  # this ends the progress bar