python-文本进度条+计时time库函数

#TextProBarV3.py
import time
scale = 50    #进度条总长度
print("执行开始".center(scale//2, "-"))
start = time.perf_counter()     #time库的perf_counter方法实现获取系统时间，精确到微秒
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='') #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
    time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,'-'))

#TextProBarV1.py
import time
scale = 10
print("------执行开始------")
for i in range(scale+1):
    a = '*' * i
    b = '.' * (scale - i)
    c = (i/scale)*100
    print("{:^3.0f}%[{}->{}]".format(c,a,b))
    time.sleep(0.1)
print("------执行结束------")

#TextProBarV2.py
import time
for i in range(101):
    print("\r{:3}%".format(i), end="")
    time.sleep(0.1)