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# textbar.py
# 渐变显示进度条
import time
scale = 50
print("执行开始".center(scale//2, "-"))  # str.center(width, fillchar)宽度和填充字符
start = time.perf_counter() # 计时
for i in range(scale+1):
    p = i / scale
    power = (p + (1 - p)/2) ** 8  #函数 进度条设计
    c = power * 100
    a = '*' * int(c)
    b = '.' * (scale - int(c))
    dur = time.perf_counter() - start
    print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c, a, b, dur), end="") # ^数字居中符号 3.2前面是整数保留位数，后面是小数
    time.sleep(0.1)
print("\n"+"执行结束".center(scale//2, "-"))