最近后台关注的粉丝越来越多，大部分其实还是偏入门和基础！很多小伙伴加了菜鸟学Python小助手的微信，有一些在问一些入门的问题，有一些在问如何学习Python.
其实Python是入门容易精通难，大家平时要养成记录的习惯，好的代码要记录下来，学会总结，经常翻一翻会有收获！今天我来分享一些我自己记录的代码结构，欢迎拍砖！
01.
简洁的表达式
点评：Python因为简洁高效而出名，就是因为语法非常简单，而且内置了很多强大的数据结构：
-
比如我们可以大量用推导列表来生成很多简洁的代码
-
比如我们可以用if else组合，本来需要2-3行代码写的，一行搞定！
02.排序
忽略想起了一句台词，“有人的地方就有江湖”，那么有数组这样的数据结构一定涉及到排序，取最大值，取最小值。
点评：这个heapq库非常好用，尤其是我们在取一些列表的头部数据，比如最大几个，最小几个经常用到，很实用的一招！啥也不说了，赶紧背下来！
03.查询
排序和查询都是好基友，长的数据结构里面(字典，列表)里面我们一定会有查询，过滤的需求。有的时候，我们需要从一个很长的列表里面，找到某一个或者某一类的元素，怎么办，很简单，用高级函数filter :
1).用lambda配合filter过滤
点评:lambda是一个非常简洁的函数表达方式，短小精悍，加上配合filter一起使用，非常漂亮。比如我们通过 字符串里的startswith内置函数，非常方便的过滤出列表里面我们需要的数据！(Python3稍微改一下再filter之外再加一个list,不然生成的是迭代器地址)
点评：正则是一个非常不错的过滤方法，有的时候好的正则顶的上几十行代码，精通正则对玩数据分析，数据清洗是必需的技能！
04.
碾平list
有的时候我们会遇到复杂的数据结构，比如列表里面套列表，层层嵌套，非常麻烦。有几种方法可以碾平:
1).第一种传统方法
点评：这里面就是用递归来解决的，思路非常简单清晰，但是递归一定要有出口，设计的时候要注意。
2).下面两种都是高手的写法：
.
点评：这两招看上去非常简单，实际上理解起来很复杂，把很多技巧结合在一行里面，反正第二种我还能接受，第三种口味太重了，看的有点晕！
05.
带条件的推导列表
推导列表应该是我最喜欢的一种Pythonic方式，它的演变有很多手法，这几种都是非常常见的，多读几遍，背下来！
06.
漂亮的添加字典的方法
设计数据结构的时候，字典是必须的！很多时候我们会用带下面的字典更新的方法，当然更好的是collections模块里面的defaultdict!
点评：dict.update还是比较平易近人的，这个dict(dict,**options)用法我第一次看到的时候也是楞了一些，什么鬼，现在见多了，也就习惯了！
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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(230, 230, 230)" data-darkmode-original-color-15870356071023="rgb(0, 0, 0)" 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(230, 230, 230)" data-darkmode-original-color-15882384789136="rgb(0, 0, 0)" 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(230, 230, 230)" data-darkmode-original-color-15882396318564="rgb(0, 0, 0)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" 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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: 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