第五周练习 part3 --- xml 处理 

 1 # xml 处理
 2 import xml.etree.ElementTree as ET
 3 
 4 tree = ET.parse("xml_test.xml")
 5 root = tree.getroot()
 6 print(root.tag)
 7 
 8 # 遍历xml文档
 9 for child in root:
10     print(child.tag, child.attrib)
11     for i in child:
12         print(i.tag, i.text)
13 
14 # 只遍历year 节点
15 for node in root.iter('year'):
16     print(node.tag, node.text)
17 
18 
19 ------------------------------------------------
20 
21 
22 # xml 修改
23 import xml.etree.ElementTree as ET
24 
25 tree = ET.parse("xml_test.xml")
26 root = tree.getroot()
27 
28 # 修改
29 for node in root.iter('year'):
30     new_year = int(node.text) + 1
31     node.text = str(new_year)
32     node.set("updated", "yes")
33 
34 tree.write("xmltest.xml")
35 
36 # 删除node
37 for country in root.findall('country'):
38     rank = int(country.find('rank').text)
39     if rank > 50:
40         root.remove(country)
41 
42 tree.write('output.xml')
43 
44 
45 -----------------------------------------------------------
46 
47 
48 # xml 创建
49 import xml.etree.ElementTree as ET
50  
51  
52 new_xml = ET.Element("namelist")
53 name = ET.SubElement(new_xml,"name",attrib={"enrolled":"yes"})
54 age = ET.SubElement(name,"age",attrib={"checked":"no"})
55 sex = ET.SubElement(name,"sex")
56 sex.text = '33'
57 name2 = ET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
58 age = ET.SubElement(name2,"age")
59 age.text = '19'
60  
61 et = ET.ElementTree(new_xml) #生成文档对象
62 et.write("test.xml", encoding="utf-8",xml_declaration=True)
63  
64 ET.dump(new_xml) #打印生成的格式
 1 <data>
 2     <country name="Liechtenstein">
 3         <rank updated="yes">2</rank>
 4         <year updated_by="Alex">2009</year>
 5         <gdppc>141100</gdppc>
 6         <neighbor direction="E" name="Austria" />
 7         <neighbor direction="W" name="Switzerland" />
 8     </country>
 9     <country name="Singapore">
10         <rank updated="yes">5</rank>
11         <year updated_by="Alex">2012</year>
12         <gdppc>59900</gdppc>
13         <neighbor direction="N" name="Malaysia" />
14     </country>
15     <country name="Panama">
16         <rank updated="yes">69</rank>
17         <year updated_by="Alex">2012</year>
18         <gdppc>13600</gdppc>
19         <neighbor direction="W" name="Costa Rica" />
20         <neighbor direction="E" name="Colombia" />
21         <info>
22             <population>8</population>
23             <size>960</size>
24         </info>
25     </country>
26 </data>

 

posted @ 2018-05-05 10:56  Lief_1997  阅读(113)  评论(0)    收藏  举报