前言
闲来无事，想起来之前在简书发过的文章还没搬过去，正想搬一篇 lxml 和 re 效率比照的，后果发现代码没了，索性重写一次。
先上后果：
只做解析加取数据，re 比 lxml 快了 300%！
解析加 pandas 解决数据，re 比 lxml 快 40%
其实这个测试后果应该没什么好纠结的，预计应该是 re 优于 lxml，二者都优于 beautifulsoup。
因为很少用 beautifulsoup，所以这次没测试它。
注意事项
为了防止网络稳定，测试时不应该把网络申请工夫计算进去，这里应用参数传入要解析的 HTML。
另外，解析语句的写法优劣会在极大水平上影响后果，所以个别工作重点应该放在表达式的写法上。
小技巧
导出 list 列表数据的时候间接来一个 pandas，省时省力
代码
# -*- encoding: utf-8 -*-
'''
@File : test-re-lxml.py
@Time : 2021 年 12 月 18 日 22:33:10 星期六
@Author : erma0
@Version : 1.0
@Link : https://erma0.cn
@Desc : 测试 re lxml 效率
'''
import re
import time
import pandas as pd
import requests
from lxml import etree
from itertools import zip_longest
# ahtml = requests.get('http://test.cn/').text
ahtml = '''<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title> 教育网盘 </title>
<style type="text/css">
<!--
td {font-size: 12px;}
a:link {text-decoration: none;}
body {font-size: 12px;}
a:visited {text-decoration: none;}
a:hover {
color: #FF0000;
text-decoration: underline;
}
-->
</style>
</head>
<body>
<table width="90%" border="0" align="center" class="list">
<tr bgcolor=#BFE6FD height="20">
<td width="42" align=center> 图标 </td>
<td width="381" align=center> 文件名 </td>
<td width="98" align=center> 所属用户 </td>
<td width="85" align=center> 大小 </td>
<td width="132" align=center> 更新工夫 </td>
</tr>
<div class=main_content_2 id=content>
<!-- Copyright(C) 2005-2010 All Rights Reserved. -->
<tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/pdf.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%bc%bc%ca%f5%bd%bb%b5%d7%2f1%c6%fb%b0%fc%b0%b2%d7%b0%ca%a9%b9%a4%bc%bc%ca%f5%bd%bb%b5%d7.pdf>1 汽包装置施工技术交底.pdf</a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>871.49 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/doc.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%bc%bc%ca%f5%bd%bb%b5%d7%2f%cb%ae%c0%e4%b1%da%b0%b2%d7%b0%ca%a9%b9%a4%bc%bc%ca%f5%bd%bb%b5%d7.doc> 水冷壁装置施工技术交底.doc</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%bc%bc%ca%f5%bd%bb%b5%d7%2f%2f%cb%ae%c0%e4%b1%da%b0%b2%d7%b0%ca%a9%b9%a4%bc%bc%ca%f5%bd%bb%b5%d7.doc' title='查看文件 水冷壁装置施工技术交底.doc' target=_blank><img 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height=20><td width=25 align=center><img src=http://pan.test.com/filetype/doc.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%bc%bc%ca%f5%bd%bb%b5%d7%2f%d1%cc%b5%c0%b0%b2%d7%b0%ca%a9%b9%a4%bc%bc%ca%f5%bd%bb%b5%d7+-+%b8%b1%b1%be.doc> 烟道装置施工技术交底 - 正本.doc</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%bc%bc%ca%f5%bd%bb%b5%d7%2f%2f%d1%cc%b5%c0%b0%b2%d7%b0%ca%a9%b9%a4%bc%bc%ca%f5%bd%bb%b5%d7+-+%b8%b1%b1%be.doc' title='查看文件 烟道装置施工技术交底 - 正本.doc' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>130.84 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/doc.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f(%d7%ee%d6%d5%a3%a9%c9%bd%ce%f7%b6%ab%d2%e5%b8%c9%cf%a8%bd%b9%b9%a4%b3%cc%ca%a9%b9%a4%d7%e9%d6%af%c9%e8%bc%c60610.doc>( 最终）山西东义干熄焦工程施工组织设计 0610.doc</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%2f(%d7%ee%d6%d5%a3%a9%c9%bd%ce%f7%b6%ab%d2%e5%b8%c9%cf%a8%bd%b9%b9%a4%b3%cc%ca%a9%b9%a4%d7%e9%d6%af%c9%e8%bc%c60610.doc' title='查看文件 ( 最终）山西东义干熄焦工程施工组织设计 0610.doc' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>2.4 M</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%b6%ab%d2%e5%b8%c9%cf%a8%bd%b9%b9%f8%c2%af%cb%ae%d1%b9%ca%d4%d1%e9%b7%bd%b0%b8(1)10.10.docx> 东义干熄焦锅炉水压试验计划 (1)10.10.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%2f%b6%ab%d2%e5%b8%c9%cf%a8%bd%b9%b9%f8%c2%af%cb%ae%d1%b9%ca%d4%d1%e9%b7%bd%b0%b8(1)10.10.docx' title='查看文件 东义干熄焦锅炉水压试验计划 (1)10.10.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>103.62 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/doc.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%c9%bd%ce%f7%b8%c9%cf%a8%bd%b9%b9%f8%c2%af%cb%ae%c0%e4%b1%da%b0%b2%d7%b0%b7%bd%b0%b80507.doc> 山西干熄焦锅炉水冷壁装置计划 0507.doc</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%2f%c9%bd%ce%f7%b8%c9%cf%a8%bd%b9%b9%f8%c2%af%cb%ae%c0%e4%b1%da%b0%b2%d7%b0%b7%bd%b0%b80507.doc' title='查看文件 山西干熄焦锅炉水冷壁装置计划 0507.doc' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>711.05 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%b6%ab%d2%e5%c6%fb%b0%fc%b5%f5%d7%b0%ca%a9%b9%a4%b7%bd%b0%b8+0710.docx> 东义汽包吊装施工计划 0710.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%2f%b6%ab%d2%e5%c6%fb%b0%fc%b5%f5%d7%b0%ca%a9%b9%a4%b7%bd%b0%b8+0710.docx' 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href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%c9%bd%ce%f7%b6%ab%d2%e5%b9%f8%c2%af%b8%d6%bc%dc%b0%b2%d7%b0%ca%a9%b9%a4%b7%bd%b0%b80520.doc> 山西东义锅炉钢架装置施工计划 0520.doc</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%2f%c9%bd%ce%f7%b6%ab%d2%e5%b9%f8%c2%af%b8%d6%bc%dc%b0%b2%d7%b0%ca%a9%b9%a4%b7%bd%b0%b80520.doc' title='查看文件 山西东义锅炉钢架装置施工计划 0520.doc' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>1.08 M</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%bc%bc%ca%f5%2f%ca%a9%b9%a4%b7%bd%b0%b8%2f%b6%ab%d2%e5230T%b8%c9%cf%a8%bd%b9%d3%e0%c8%c8%b9%f8%c2%af%b0%b2%d7%b0%b7%bd%b0%b8.docx> 东义 230T 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src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>47.07 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/pdf.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f1%c6%fb%b0%fc%b0%b2%d7%b0%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.pdf>1 汽包装置平安技术交底.pdf</a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>908.46 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%d3%e0%c8%c8%b9%f8%c2%af%c8%eb%bf%da%d1%cc%b5%c0%b0%b2%d7%b0%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx> 余热锅炉入口烟道装置平安技术交底.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%d3%e0%c8%c8%b9%f8%c2%af%c8%eb%bf%da%d1%cc%b5%c0%b0%b2%d7%b0%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx' title='查看文件 余热锅炉入口烟道装置平安技术交底.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>50.87 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%d3%e0%c8%c8%b9%f8%c2%af%b8%d6%bd%e1%b9%b9%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx> 余热锅炉钢结构平安技术交底.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%d3%e0%c8%c8%b9%f8%c2%af%b8%d6%bd%e1%b9%b9%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx' title='查看文件 余热锅炉钢结构平安技术交底.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>50.86 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%b5%f5%d7%b0%d6%b8%bb%d3%b0%b2%c8%ab%bd%bb%b5%d7.docx> 吊装指挥平安交底.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%b5%f5%d7%b0%d6%b8%bb%d3%b0%b2%c8%ab%bd%bb%b5%d7.docx' title='查看文件 吊装指挥平安交底.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>13.59 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%cb%ae%d1%b9%ca%d4%d1%e9%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx> 水压试验平安技术交底.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%cb%ae%d1%b9%ca%d4%d1%e9%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx' title='查看文件 水压试验平安技术交底.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>48.24 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%d2%c6%b6%af%bd%c5%ca%d6%bc%dc%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7+-+10.31.docx> 挪动脚手架平安技术交底 - 10.31.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%d2%c6%b6%af%bd%c5%ca%d6%bc%dc%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7+-+10.31.docx' title='查看文件 挪动脚手架平安技术交底 - 10.31.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>45.41 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> <tr bgcolor=#E8F0FF height=20><td width=25 align=center><img src=http://pan.test.com/filetype/docx.gif></td><td><a href=homeapply.aspx?down=ok&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%d3%e0%c8%c8%b9%f8%c2%af%cb%ae%c0%e4%b1%da%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx> 余热锅炉水冷壁平安技术交底.docx</a><a href='http://pan.test.com/show.aspx?type=4&filepath=HNAZ%2f%b0%b2%c8%ab%2f%b0%b2%c8%ab%bd%bb%b5%d7%2f%2f%d3%e0%c8%c8%b9%f8%c2%af%cb%ae%c0%e4%b1%da%b0%b2%c8%ab%bc%bc%ca%f5%bd%bb%b5%d7.docx' title='查看文件 余热锅炉水冷壁平安技术交底.docx' target=_blank><img src=http://pan.test.com/pics/edit.gif border=0></a> <font color=#999999></font></td><td width=120 align=center>HNAZ</td><td width=120> <div lign=center>50.98 K</div></td><td width=120><div align=center>2021-11-23</div></td></tr> </div>
<tr>
<td colspan="5" align=center><div align="center"> 总共记录数：3276 页码：<a href=http://test.com/newshare.aspx?page=10 class=page>...</a> <a href=http://test.com/newshare.aspx?page=11 class=page>11</a> <a href=http://test.com/newshare.aspx?page=12 class=page>12</a> <a href=http://test.com/newshare.aspx?page=13 class=page>13</a> <a href=http://test.com/newshare.aspx?page=14 class=page>14</a> <a href=http://test.com/newshare.aspx?page=15 class=page>15</a> <span class=10>16</span> <a href=http://test.com/newshare.aspx?page=17 class=page>17</a> <a href=http://test.com/newshare.aspx?page=18 class=page>18</a> <a href=http://test.com/newshare.aspx?page=19 class=page>19</a> <a href=http://test.com/newshare.aspx?page=20 class=page>20</a> <a href=http://test.com/newshare.aspx?page=21 class=page>...</a><a href=http://test.com/newshare.aspx?page=1> 第一页 </a><a href=http://test.com/newshare.aspx?page=15> 上一页 </a><a href=http://test.com/newshare.aspx?page=17> 下一页 </a><a href=http://test.com/newshare.aspx?page=164> 最末页 </a> 第 16 页 / 共 164 页 </div></td>
</tr>
</table>
</body>
</html>
'''
def get_lxml(html):
d = etree.HTML(html)
link = d.xpath('//tr/td[2]/a[1]/@href')
title = d.xpath('//tr/td[2]/a[1]/text()')
passwd = d.xpath('//tr/td[2]/font/text()')
user = d.xpath('//tr/td[3][@width="120"]/text()')
size = d.xpath('//tr/td[4]/div/text()')
time = d.xpath('//tr/td[5]/div/text()')
datas = list(zip_longest(link, title, passwd, user, size, time, fillvalue=''))
datas = pd.DataFrame(datas, columns=['link', 'title', 'passwd', 'user', 'size', 'time'])
datas['link'] = datas['link'].str.strip()
datas.to_csv('result-lxml.csv')
# print(len(datas))
return datas
def get_re(html):
datas = []
# datas= r.findall(html)
datas = re.findall(rep, html, re.S)
# for data in datas: # link, title, passwd, user, time
# pass
# print(len(datas))
datas = pd.DataFrame(datas, columns=['link', 'title', 'passwd', 'user', 'size', 'time'])
datas['link'] = datas['link'].str.strip()
datas.to_csv('result-re.csv')
return datas
if __name__ == '__main__':
rep = r"<td><a href=([\s\S]*?)>([\s\S]*?)</a>[\s\S]*?<font color=#999999>([\s\S]*?)</font>[\s\S]*?center>([\s\S]*?)</td><td width=120> <div lign=center>([\s\S]*?)</div></td><td width=120><div align=center>([\s\S]*?)</div>"
r = re.compile(rep, re.S)
for name, function in [('lxml', get_lxml), ('re', get_re)]:
start = time.time()
for i in range(500):
function(ahtml)
# function(ahtml)
end = time.time()
print(name, end - start)后果
lxml 2.1219968795776367
re 1.341965675354004re 比 lxml 快了靠近 40%
再测试一下纯解析的效率
因为下面代码中计算了 pandas 的数据处理工夫，应用上面把它正文掉再测试一下，代码如下：
def get_lxml(html):
d = etree.HTML(html)
link = d.xpath('//tr/td[2]/a[1]/@href')
title = d.xpath('//tr/td[2]/a[1]/text()')
passwd = d.xpath('//tr/td[2]/font/text()')
user = d.xpath('//tr/td[3][@width="120"]/text()')
size = d.xpath('//tr/td[4]/div/text()')
time = d.xpath('//tr/td[5]/div/text()')
def get_re(html):
# datas= r.findall(html)
datas = re.findall(rep, html, re.S)后果 2
lxml 0.6280360221862793
re 0.15498137474060059单纯解析加取数据，re 比 lxml 快了 300%！