进度条

 import math
 2 import time
 3 scale=10
 4 print("执行开始")
 5 t=time.process_time()
 6 for i in range(scale+1):
 7     a,b='**'*i,'..'*(scale-i)
 8     c=(i/scale)*100
 9     π=4*(4*math.atan(1/5)-math.atan(1/239))
10     print("%{:3}[{}->{}]".format(a,b,c))
11     time.sleep(0.1)
12 print(π)
13 print("{:.2f}s".format(t))
14 print("执行结束")