bs4解析xml文件，制作xml文件

使用BS4解析XML文件用法

1. html.parser

from bs4 import BeautifulSoup

soup = BeautifulSoup(html, "html.parser")
两个参数：第一个参数是要解析的html文本，第二个参数是使用那种解析器，对于HTML来讲就是html.parser，这个是bs4自带的解析器
2.

 soup = BeautifulSoup(html, "lxml")

查找所有符合条件的标签

a)使用tag查找

soup.find_all('b')
b)正则表达式查找

soup.find_all(re.compile("^b"))

c)按列表中提供的tab查找

soup.find_all(["a", "b"])

d)实例
解析html将dt中class和ul中text找到放人字典中
b.html内容：

<div class="MuneDown"> 
      <dl> 
       <dt class="menuListBox"> 
        <ul class="a"> xxx</ul> 
       </dt> 
       <dd class="adMuneBox validateArea" _bamboo_rep_transid="150166001-1" _bamboo_rep_menuid="" modulecode="module_nav_myunicom" _bamboo_rep_productlink="" validatetype="module_logo_area_2" rowrecordid="b6303d42ec84468badfd05cb88ef20d2"></dd> 
      </dl> 
     </div> 
</div>

代码如下：

#!/usr/bin/env python
#coding:utf-8

import os
import sys
import lxml
from bs4 import BeautifulSoup

xml_file = sys.argv[1]
with open(xml_file, 'r') as f:
    xml = f.read()

soup = BeautifulSoup(xml, 'lxml')
link_content = soup.select("div[class='MuneDown']")
result = {}
for item in link_content:
    dt = item.dt["class"][0]
    ul = item.select("ul[class='a']")[0].get_text()
    print("dt:{}".format(dt))
    print("ul: {}".format(ul))
    result[dt] = ul
print(result)

运行结果：

dt:menuListBox
ul:  xxx
{'menuListBox': ' xxx'}

参考链接：

https://www.cnblogs.com/gl1573/p/9480022.html
https://www.jianshu.com/p/9254bdc467b2

第二部分 制作lxml文件

代码示例：

#!/usr/bin/env python
#coding:utf-8
from xml.dom.minidom import Document
import xml.dom.minidom
doc = Document()  #创建DOM文档对象
Object = doc.createElement('Objects')
doc.appendChild(Object)
label_name='person'
label=15
label_attribute = ("name", "lala")
xmin=207
ymin=106
xmax=489
ymax=381
score=0.99566
object_name = doc.createElement(label_name)
#object_name.setAttribute('物体类别',label_name)#设置命名空间
Object.appendChild(object_name)
object_label =doc.createElement('label')
object_label.setAttribute(label_attribute[0],label_attribute[1])
object_label_text = doc.createTextNode(str(label)) #元素内容写入
object_label.appendChild(object_label_text)
object_name.appendChild(object_label)

object_xmin =doc.createElement('xmin')
object_xmin_text = doc.createTextNode(str(xmin)) #元素内容写入
object_xmin.appendChild(object_xmin_text)
object_name.appendChild(object_xmin)

object_ymin =doc.createElement('ymin')
object_ymin_text = doc.createTextNode(str(ymin)) #元素内容写入
object_ymin.appendChild(object_ymin_text)
object_name.appendChild(object_ymin)

object_xmax =doc.createElement('xmax')
object_xmax_text = doc.createTextNode(str(xmax)) #元素内容写入
object_xmax.appendChild(object_xmax_text)
object_name.appendChild(object_xmax)

object_ymax =doc.createElement('ymax')
object_ymax_text = doc.createTextNode(str(ymax)) #元素内容写入
object_ymax.appendChild(object_ymax_text)
object_name.appendChild(object_ymax)

object_score= doc.createElement('score')
object_score_text = doc.createTextNode(str(score)) #元素内容写入
object_score.appendChild(object_score_text)
object_name.appendChild(object_score)

f = open('parameter.xml','w')
doc.writexml(f,indent = '	',newl = '
', addindent = '	',encoding='utf-8')
f.close()

生成xml文件如下

<?xml version="1.0" encoding="utf-8"?>
    <Objects>
        <person>
            <label name="lala">15</label>
            <xmin>207</xmin>
            <ymin>106</ymin>
            <xmax>489</xmax>
            <ymax>381</ymax>
            <score>0.99566</score>
        </person>
    </Objects>

参考链接：

https://blog.csdn.net/jqw11/article/details/70670003

https://www.cnblogs.com/zhugaopeng/p/9665365.html