(中国大学MOOC（慕课）《Python语言程序设计》笔记)

# TextProBarV3.py
import time
scale = 50
print("执行开始")
start = time.perf_counter()
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="")
    time.sleep(0.1)
print("\n" + "执行结束".center(scale // 2, "-"))