用Python算带有进度条的圆周率

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