代码如下 def PI(n): pi=0 for k in range(n): pi += 1/pow(16,k)*(4/(8*k+1)-2/(8*k+4)-1/(8*k+5)-1/(8*k+6)) return pi import time scale = 20 print(执行开始.center(scale+4,'-')) for i in range(scale+1): a='*' * i b='.' * (scale-i) c=(i/scale)*100