Python学习笔记4基本数据类型续

本是古典何须时尚 2022-01-08 00:05 238阅读 0赞

start  16:36

时间格式化

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![1669067-20190426213103005-553483472.png][]

程序计时：指测量起止动作所经历的时间的过程

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![1669067-20190426215341043-1880351622.png][]

实例四文本进度条

![1669067-20190426220111343-840674893.png][]![1669067-20190426221816706-400641110.png][]

\#a表示星号被复制的的次数

文本进度条的动态刷新

![1669067-20190426221956523-82231836.png][]

实现刷新功能的简单代码，但你会发现并没有实现在同一行，是因为这是在idle环境下，它是编写程序的开发环境，而不是主要的运行环境。它把\\r这个功能屏蔽掉了。我们可以使用下面这个命令行：

![1669067-20190426222543573-1136736102.png][]

刷新进度条的完整结果

![1669067-20190426222737736-240034683.png][]

![1669067-20190426222941072-407138189.png][]

1 import time
     2 scale = 50
     3 print("执行开始".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".center(scale//2,'-'))

在cmd下运行（win+R,输入cmd）

![1669067-20190426224814271-723190154.png][]

![1669067-20190426231730423-715248042.png][]

![1669067-20190426232018008-338049325.png][]

转载于:https://www.cnblogs.com/lcy1995/p/10775093.html

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