知行编程网知行编程网  2022-05-29 04:00 知行编程网 隐藏边栏 |   抢沙发  1 
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再见,正则表达式


从一段指定的字符串中,取得期望的数据,正常人都会想到正则表达式吧?

写过正则表达式的人都知道,正则表达式入门不难,写起来也容易。

但是正则表达式几乎没有可读性可言,维护起来,真的会让人抓狂,别以为这段正则是你写的就可以驾驭它,过个一个月你可能就不认识它了。

完全可以说,天下苦正则久矣。

今天给你介绍一个好东西,可以让你摆脱正则的噩梦,那就是 Python 中一个非常冷门的库 --  parse 。

1. 真实案例

拿一个最近使用 parse 的真实案例来举例说明。

下面是 ovs 一个条流表,现在我需要收集提取一个虚拟机(网口)里有多少流量、多少包流经了这条流表。也就是每个 in_port 对应的 n_bytes、n_packets 的值 。

如果是你,你会怎么做呢?

先以逗号分隔开来,再以等号分隔取出值来?

你不防可以尝试一下,写出来的代码应该和我想象的一样,没有一丝美感而言。

我来给你展示一下,我是怎么做的?

再见,正则表达式

可以看到,我使用了一个叫做 parse 的第三方包,是需要自行安装的

从上面这个案例中,你应该能感受到 parse 对于解析规范的字符串,是非常强大的。

2. parse 的结果

parse 的结果只有两种结果:

  1. 没有匹配上,parse 的值为None
  1. 如果匹配上,parse 的值则 为 Result 实例

如果你编写的解析规则,没有为字段定义字段名,也就是匿名字段, Result 将是一个 类似 list 的实例,演示如下:

而如果你编写的解析规则,为字段定义了字段名, Result 将是一个 类似 字典 的实例,演示如下:

3. 重复利用 pattern

和使用 re 一样,parse 同样支持 pattern 复用。

4. 类型转化

从上面的例子中,你应该能注意到,parse 在获取年龄的时候,变成了一个"27" ,这是一个字符串,有没有一种办法,可以在提取的时候就按照我们的类型进行转换呢?

你可以这样写。

除了将其转为 整型,还有其他格式吗?

内置的格式还有很多,比如

匹配时间

更多类型请参考官方文档:

Type Characters Matched Output
l Letters (ASCII) str
w Letters, numbers and underscore str
W Not letters, numbers and underscore str
s Whitespace str
S Non-whitespace str
d Digits (effectively integer numbers) int
D Non-digit str
n Numbers with thousands separators (, or .) int
% Percentage (converted to value/100.0) float
f Fixed-point numbers float
F Decimal numbers Decimal
e Floating-point numbers with exponent e.g. 1.1e-10, NAN (all case insensitive) float
g General number format (either d, f or e) float
b Binary numbers int
o Octal numbers int
x Hexadecimal numbers (lower and upper case) int
ti ISO 8601 format date/time e.g. 1972-01-20T10:21:36Z (“T” and “Z” optional) datetime
te RFC2822 e-mail format date/time e.g. Mon, 20 Jan 1972 10:21:36 +1000 datetime
tg Global (day/month) format date/time e.g. 20/1/1972 10:21:36 AM +1:00 datetime
ta US (month/day) format date/time e.g. 1/20/1972 10:21:36 PM +10:30 datetime
tc ctime() format date/time e.g. Sun Sep 16 01:03:52 1973 datetime
th HTTP log format date/time e.g. 21/Nov/2011:00:07:11 +0000 datetime
ts Linux system log format date/time e.g. Nov 9 03:37:44 datetime
tt Time e.g. 10:21:36 PM -5:30 time

5. 提取时去除空格

去除两边空格

去除左边空格

去除右边空格

6. 大小写敏感开关

Parse 默认是大小写不敏感的,你写 hello 和 HELLO 是一样的。

如果你需要区分大小写,那可以加个参数,演示如下:

7. 匹配字符数

精确匹配:指定最大字符数

模糊匹配:指定最小字符数

若要在精准/模糊匹配的模式下,再进行格式转换,可以这样写

8. 三个重要属性

Parse 里有三个非常重要的属性

  • fixed:利用位置提取的匿名字段的元组
  • named:存放有命名的字段的字典
  • spans:存放匹配到字段的位置

下面这段代码,带你了解他们之间有什么不同

9. 自定义类型的转换

匹配到的字符串,会做为参数传入对应的函数

比如我们之前讲过的,将字符串转整型

其等价于

利用它,我们可以定制很多的功能,比如我想把匹配的字符串弄成全大写

10 总结一下

parse 库在字符串解析处理场景中提供的便利,肉眼可见,上手简单。

在一些简单的场景中,使用 parse 可比使用 re 去写正则开发效率不知道高几个 level,用它写出来的代码富有美感,可读性高,后期维护起代码来一点压力也没有,推荐你使用。


再见,正则表达式



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再见,正则表达式

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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)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="display: flex;justify-content: center;align-items: center;"><section data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(230, 230, 230)" data-darkmode-original-color-15860613985508="rgb(0, 0, 0)" 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(230, 230, 230)" data-darkmode-original-color-15870356070738="rgb(0, 0, 0)" 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)" data-darkmode-color-15900529136199="rgb(230, 230, 230)" data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;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="font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里,获取一波福利</span><span style="font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;font-size: 17px;text-align: justify;"></span></section></section></section></section></section></section></section>

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