进度条的实现

import sys
import time
 
def view_bar(num,total):
    rate = num/total
    rate_num = int(rate*100)
    r1 = '
%s>%d%%'%("-"*num,rate_num)
    sys.stdout.write(r1)
    sys.stdout.flush()
 
for i in range(0,101):
    time.sleep(0.5)
    view_bar(i,100)