用Python算带有进度条的圆周率

 import time

 scale=50

 print("执行开始".center(scale//2,"-"))

 start=time.perf_counter()

 for i in range(scale+1):

     a='*' *i

     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,"-"))