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1. What is XML? What are the characteristics?
xmlThat is,Extensible markup language，It can be used to mark up data and define data types. It is a source language that allows users to define their own markup language.
Example: del.xml
<?xml version="1.0" encoding="utf-8"?>
<catalog>
<maxid>4</maxid>
<login username="pytest" passwd='123456'>
<caption>Python</caption>
<item id="4">
<caption>test</caption>
</item>
</login>
<item id="2">
<caption>Zope</caption>
</item>
</catalog>
Back to the top2. Get tag properties
#coding: utf-8
import xml.dom.minidom
dom = xml.dom.minidom.parse("del.xml") #Open XML document
root = dom.documentElement #Get XML document objectprint "nodeName:", root.nodeName #Each node has its nodeName, nodeValue, nodeType attribute.print "nodeValue:", root.nodeValue #nodeValueIs the value of the node, only valid for the text node.print "nodeType:", root.nodeType
print "ELEMENT_NODE:", root.ELEMENT_NODE
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'ATTRIBUTE_NODE''CDATA_SECTION_NODE''COMMENT_NODE''DOCUMENT_FRAGMENT_NODE''DOCUMENT_NODE''DOCUMENT_TYPE_NODE''ELEMENT_NODE''ENTITY_NODE''ENTITY_REFERENCE_NODE''NOTATION_NODE''PROCESSING_INSTRUCTION_NODE''TEXT_NODE' |
Running result
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nodeName: catalognodeValue: NonenodeType: 1ELEMENT_NODE: 1 |
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3. Get child Tags
#coding: utf-8
import xml.dom.minidom
dom = xml.dom.minidom.parse("del.xml")
root = dom.documentElement
bb = root.getElementsByTagName('maxid')
print type(bb)
print bb
b = bb[0]
print b.nodeName
print b.nodeValue
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<class 'xml.dom.minicompat.NodeList'>[<DOM Element: maxid at 0x2707a48>]maxidNone |
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4. Get label attribute values
#coding: utf-8
import xml.dom.minidom
dom = xml.dom.minidom.parse("del.xml")
root = dom.documentElement
itemlist = root.getElementsByTagName('login')
item = itemlist[0]
print item.getAttribute("username")
print item.getAttribute("passwd")
itemlist = root.getElementsByTagName("item")
item = itemlist[0] #By distinguishing the location in itemlistprint item.getAttribute("id")
item2 = itemlist[1] #By distinguishing the location in itemlist
print item2.getAttribute("id")
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pytest12345642 |
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5. Get data between labels pairs
#coding: utf-8
import xml.dom.minidom
dom = xml.dom.minidom.parse("del.xml")
root = dom.documentElement
itemlist = root.getElementsByTagName('caption')
item = itemlist[0]
print item.firstChild.data
item2 = itemlist[1]
print item2.firstChild.data
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Pythontest |
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6. Example
<?xml version="1.0" encoding="UTF-8" ?>
<users>
<user id="1000001">
<username>Admin</username>
<email>admin@live.cn</email>
<age>23</age>
<sex>boy</sex>
</user>
<user id="1000002">
<username>Admin2</username>
<email>admin2@live.cn</email>
<age>22</age>
<sex>boy</sex>
</user>
<user id="1000003">
<username>Admin3</username>
<email>admin3@live.cn</email>
<age>27</age>
<sex>boy</sex>
</user>
<user id="1000004">
<username>Admin4</username>
<email>admin4@live.cn</email>
<age>25</age>
<sex>girl</sex>
</user>
<user id="1000005">
<username>Admin5</username>
<email>admin5@live.cn</email>
<age>20</age>
<sex>boy</sex>
</user>
<user id="1000006">
<username>Admin6</username>
<email>admin6@live.cn</email>
<age>23</age>
<sex>girl</sex>
</user>
</users>
# -*- coding:utf-8 -*-
from xml.dom import minidom
def get_attrvalue(node, attrname):
return node.getAttribute(attrname) if node else ''
def get_nodevalue(node, index = 0):
return node.childNodes[index].nodeValue if node else ''
def get_xmlnode(node, name):
return node.getElementsByTagName(name) if node else []
def get_xml_data(filename = 'user.xml'):
doc = minidom.parse(filename)
root = doc.documentElement
user_nodes = get_xmlnode(root, 'user')
print "user_nodes:", user_nodes
user_list=[]
for node in user_nodes:
user_id = get_attrvalue(node, 'id')
node_name = get_xmlnode(node, 'username')
node_email = get_xmlnode(node, 'email')
node_age = get_xmlnode(node, 'age')
node_sex = get_xmlnode(node, 'sex')
user_name =get_nodevalue(node_name[0])
user_email = get_nodevalue(node_email[0])
user_age = int(get_nodevalue(node_age[0]))
user_sex = get_nodevalue(node_sex[0])
user = {}
user['id'] , user['username'] , user['email'] , user['age'] , user['sex'] = (
int(user_id), user_name , user_email , user_age , user_sex
)
user_list.append(user)
return user_list
def test_load_xml():
user_list = get_xml_data()
for user in user_list :
print '-----------------------------------------------------'
if user:
user_str='No.:\t%d\nname:\t%s\nsex:\t%s\nage:\t%s\nEmail:\t%s' % (int(user['id']) , user['username'], user['sex'] , user['age'] , user['email'])
print user_str
if __name__ == "__main__":
test_load_xml()
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C:\Users\jihite\Desktop\xml>python user.pyuser_nodes: [<DOM Element: user at 0x2758c48>, <DOM Element: user at 0x2756288>, <DOM Element: user at 0x2756888>, <DOM Element: user at 0x2756e88>, <DOM Element: user at 0x275e4c8>, <DOM Element: user at 0x275eac8>]-----------------------------------------------------No.: 1000001name: Adminsex: boyage: 23Email: admin@live.cn-----------------------------------------------------No.: 1000002name: Admin2sex: boyage: 22Email: admin2@live.cn-----------------------------------------------------No.: 1000003name: Admin3sex: boyage: 27Email: admin3@live.cn-----------------------------------------------------No.: 1000004name: Admin4sex: grilage: 25Email: admin4@live.cn-----------------------------------------------------No.: 1000005name: Admin5sex: boyage: 20Email: admin5@live.cn-----------------------------------------------------No.: 1000006name: Admin6sex: grilage: 23Email: admin6@live.cn |
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7. summary
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minidom.parse(filename)Load read XML filedoc.documentElementGetting XML document objectsnode.getAttribute(AttributeName)Get XML node attribute valuenode.getElementsByTagName(TagName)Get the collection of XML node objectsnode.childNodes #Returns a list of child nodes.node.childNodes[index].nodeValueGet XML node valuenode.firstChild#Access the first node. Equivalent to pagexml.childNodes[0]doc = minidom.parse(filename)doc.toxml('UTF-8')Returns the text represented by the XML of the Node node.Node.attributes["id"]a.name #It's above."id"a.value #Attribute valueAccessing element properties |