有进度条圆周率计算

import time
scale=50
print("执行开始".center(scale//2,"-"))
start=time.perf_counter()
for i in range(scale+1):
    a='*' *ic
    b='·' *(scale-i)
    c=(i/scale)*100
    dur=time.perf_counter()-start
    print("\r{:3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end=" ")
    time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,"-"))