作业第一题

import time
sj=10
print("-"*10,"执行开始","-"*10)
for i in range(sj+1):
    a="**"*i
    b=".."*(sj-i)
    c=(i/sj)*100
    print("%{:^3.0f}[{}->{}]".format(c,a,b))
    time.sleep(0.1)
print("-"*10,"加载完成","-"*10)