Dibujo de la barra de progreso de texto de Python

import time

scale = 50
print("执行开始".center(scale // 2, "-"))   # .center 字符串处理方法，将“-”打印在字符串两侧
start = time.perf_counter()               # perf_counter() 计算时间
for i in range(scale + 1):
    a = '*' * i
    b = '.' * (scale - i)
    c = (i / scale) * 100
    dur = time.perf_counter() - start     # 计算打印文本进度条所消耗的时间
    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, '-'))