小编每天上班坐地铁，不是刷抖音就是煲电视剧，不是我不想学习，主要是短视频太好看了，30秒一个，刷刷刷的不停啊。如果Python也有30秒学习的小例子，我也一定会看呢。

于是小编收录整理了一些30秒一个短小精悍的Python小例子，让你也在碎片时间，刷Python，提高功力。

1.ascii展示对象

调用对象的 _repr_ 方法，获得该方法的返回值，如下例子返回值为字符串

2.元素至少一个为真

接受一个可迭代对象，如果可迭代对象里至少有一个元素为真，那么返回True，否则返回False

3.字符串转字节

将一个字符串转换成字节类型

将字符类型、数值类型等转换为字符串类型

4.是否可调用

判断对象是否可被调用，能被调用的对象就是一个callable 对象,比如一个普通的Student类, 需要重写Student类的__call__方法：

5.类方法

classmethod 装饰器对应的函数不需要实例化，不需要 self 参数，但第一个参数需要是表示自身类的 cls 参数，可以来调用类的属性，类的方法，实例化对象等。

6.枚举对象

返回一个可以枚举的对象，该对象的next()方法将返回一个元组。

7.过滤器

在函数中设定过滤条件，迭代元素，保留返回值为True的元素：

8.动态获取对象属性

获取对象的属性

9.对象是否有这个属性

判断对象是否有这个属性，这招经常用到

10.创建属性的两种方式

返回 property 属性，典型的用法：

使用python装饰器，实现与上完全一样的效果代码：

11.链式操作

巧妙的里面函数地址进行操作

12.^匹配字符串的开头

13.字符串切片操作

字符串切片操作——查找替换3或5的倍数

14.爬取百度首页标题

15.获取后缀名

16.xls批量转换成xlsx

17.获取指定后缀名的文件

18.批量获取文件修改时间

19.年的日历图

20.联合统计次数

Counter对象间可以做数学运算

21.groupby单字段分组

用itertools里面的groupby非常方便，但是需要先排序，分组前必须按照分组字段排序

22.定制递减迭代器

编写一个迭代器，通过循环语句，实现对某个正整数的依次递减1，直到0.

23.测试运行时长的装饰器

测试函数执行时间的装饰器示例

23个小例子，都是短小精悍的例子，大小合适，就像一口一口汤包。每一个阅读不超过30秒，希望大家碎片时间也能刷刷Python ，提升功力，一起学起来。

ref:https://github.com/jackzhenguo/python-small-examples/

end

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 菜鸟编程大本营

<pre style="letter-spacing: 0.544px;line-height: inherit;"><section data-mpa-template="t" mpa-from-tpl="t"><section data-id="94086" data-color="#276ca3" data-tools="135编辑器" mpa-from-tpl="t"><section><section mpa-from-tpl="t"><p style="text-align: center;"><img class="rich_pages" data-cropselx1="0" data-cropselx2="225" data-cropsely1="0" data-cropsely2="225" data-ratio="1" data-s="300,640"  data-type="jpeg" data-w="1280" style="box-sizing: border-box !important;visibility: visible !important;width: 225px;height: 225px;" src="https://www.zkxjob.com/wp-content/uploads/2022/05/wxsync-2022-05-9eaccd0daf13bc626cb1ce71e0f0f469.jpeg"  /></p><p style="text-align: center;"><span style="font-size: 15px;">长按，输入:【<span style="color: rgb(255, 41, 65);">书单</span>】</span></p><p style="text-align: center;"><span style="font-size: 15px;">获取一份整理的独家Python书单</span></p></section></section></section></section>

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data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;caret-color: rgb(255, 0, 0);width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="caret-color: rgb(255, 0, 0);font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;">点这里，进菜鸟学PythonB站大本营</span></section></section></section></section></section></section></section>