import sys
import time
def view_bar(num,total):
rate = num / total
rate_num = int(rate * 100)
r = ‘ \r %s>%d%%‘ % (‘=‘*num,rate_num,)
sys.stdout.write(r)
sys.stdout.flush()
if __name__ ==‘__main__‘:
for i in range(0,101):
time.sleep(0.1)
view_bar(i,100)
原文：http://www.cnblogs.com/chenxiforever/p/5721720.html