python计时time库函数

1. #TextProBarV3.py

2. import time

3. scale = 50    #进度条总长度

4. print("执行开始".center(scale//2, "-"))

5. start = time.perf_counter()     #time库的perf_counter方法实现获取系统时间，精确到微秒

6. for i in range(scale+1):

7. a = '*' * i

8. b = '.' * (scale - i)

9. c = (i/scale)*100

10. dur = time.perf_counter() - start

11. print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end='') #r回到行首实现单行动态刷新，IDLE会屏蔽/r功能，请在cmd用python命令运行程序

12. time.sleep(0.1)

13. print("\n"+"执行结束".center(scale//2,'-'))

1. #TextProBarV1.py

2. import time

3. scale = 10

4. print("------执行开始------")

5. for i in range(scale+1):

6. a = '*' * i

7. b = '.' * (scale - i)

8. c = (i/scale)*100

9. print("{:^3.0f}%[{}->{}]".format(c,a,b))

10. time.sleep(0.1)

11. print("------执行结束------")

1. #TextProBarV2.py

2. import time

3. for i in range(101):

4. print("\r{:3}%".format(i), end="")

5. time.sleep(0.1)