带时间的进度条

gzj137070928

导入time模块来计算代码运行的时间，加上代码迭代进度使用格式化字符串来输出代码运行进度

1. import time
   
2. scale = 50
   
3. print("执行开始，祈祷不报错".center(scale // 2,"-"))
   
4. start = time.perf_counter()
   
5. for i in range(scale + 1):
   
6.     a = "*" * i
   
7.     b = "." * (scale - i)
   
8.     c = (i / scale) * 100
   
9.     dur = time.perf_counter() - start
   
10.     print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end = "")
    
11.     time.sleep(0.1)
    
12. print("\n"+"执行结束，万幸".center(scale // 2,"-"))

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