程序代码:
import time
scale=50
print("执行开始".center(scale//2,'-'))
t=time.clock()
for i in range(scale+1):
a='*'*i
b='.'*(scale-i)
c=(i/scale)*100
t-=time.clock()
print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,-t),end=' ')
time.sleep(0.05)
print("\n"+"执行结束".center(scale//2,'-'))