1 import sys
  2 import time
  3 def view_bar(num,total):
  4     rate = float(num) / float(total)
  5     rate_num = int(rate * 100)
  6     r = ‘\r%d%%‘ % (rate_num,)
  7     sys.stdout.write(r)
  8     sys.stdout.flush()
  9 if __name__ == ‘__main__‘:
 10     for i in range(0,101):
 11         time.sleep(0.1)
 12         view_bar(i,100)