python解析xml模块封装代码
有如下的xml文件:
<?xml version="1.0" encoding="utf-8" ?>
<root>
<childs>
<child name='first' >1</child>
<child value="2">2</child>
</childs>
</root>
下面介绍python解析xml文件的几种方法,使用python模块实现。
方式1,python模块实现自动遍历所有节点:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from xml.sax.handler import contenthandler
from xml.sax import parse
class testhandle(contenthandler):
def __init__(self, inlist):
self.inlist = inlist
def startelement(self,name,attrs):
print 'name:',name, 'attrs:',attrs.keys()
def endelement(self,name):
print 'endname',name
def characters(self,chars):
print 'chars',chars
self.inlist.append(chars)
if __name__ == '__main__':
lt = []
parse('test.xml', testhandle(lt))
print lt
结果:
[html] view plaincopy
name: root attrs: []
chars
name: childs attrs: []
chars
name: child attrs: [u'name']
chars 1
endname child
chars
name: child attrs: [u'value']
chars 2
endname child
chars
endname childs
chars
endname root
[u'\n', u'\n', u'1', u'\n', u'2', u'\n', u'\n']
方式2,python模块实现获取根节点,按需查找指定节点:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from xml.dom import minidom
xmlstr = '''''<?xml version="1.0" encoding="utf-8"?>
<hash>
<request name='first'>/2/photos/square/type.xml</request>
<error_code>21301</error_code>
<error>auth faild!</error>
</hash>
'''
def doxml(xmlstr):
dom = minidom.parsestring(xmlstr)
print 'dom:'
print dom.toxml()
root = dom.firstchild
print 'root:'
print root.toxml()
childs = root.childnodes
for child in childs:
print child.toxml()
if child.nodetype == child.text_node:
pass
else:
print 'child node attribute name:', child.getattribute('name')
print 'child node name:', child.nodename
print 'child node len:',len(child.childnodes)
print 'child data:',child.childnodes[0].data
print '======================================='
print 'more help info to see:'
for med in dir(child):
print help(med)
if __name__ == '__main__':
doxml(xmlstr)
结果:
[html] view plaincopy
dom:
<?xml version="1.0" ?><hash>
<request name="first">/2/photos/square/type.xml</request>
<error_code>21301</error_code>
<error>auth faild!</error>
</hash>
root:
<hash>
<request name="first">/2/photos/square/type.xml</request>
<error_code>21301</error_code>
<error>auth faild!</error>
</hash>
<request name="first">/2/photos/square/type.xml</request>
child node attribute name: first
child node name: request
child node len: 1
child data: /2/photos/square/type.xml
=======================================
more help info to see:
两种方法各有其优点,python的xml处理模块太多,目前只用到这2个。
=====补充分割线================
实际工作中发现python的mimidom无法解析其它编码的xml,只能解析utf-8的编码,而其xml文件的头部申明也必须是utf-8,为其它编码会报错误。
网上的解决办法都是替换xml文件头部的编码申明,然后转换编码为utf-8再用minidom解码,实际测试为可行,不过有点累赘的感觉。
本节是 python解析xml模块封装代码 的第二部分。
====写xml内容的分割线=========
#!\urs\bin\env python
#encoding: utf-8
from xml.dom import minidom
class xmlwrite:
def __init__(self, resultfile):
self.resultfile = resultfile
self.rootname = 'api'
self.__create_xml_dom()
def __create_xml_dom(self):
xmlimpl = minidom.getdomimplementation()
self.dom = xmlimpl.createdocument(none, self.rootname, none)
self.root = self.dom.documentelement
def __get_spec_node(self, xpath):
patharr = xpath.split(r'/')
parentnode = self.root
exist = 1
for nodename in patharr:
if nodename.strip() == '':
continue
if not exist:
return none
spcindex = nodename.find('[')
if spcindex > -1:
index = int(nodename[spcindex+1:-1])
else:
index = 0
count = 0
childs = parentnode.childnodes
for child in childs:
if child.nodename == nodename[:spcindex]:
if count == index:
parentnode = child
exist = 1
break
count += 1
continue
else:
exist = 0
return parentnode
def write_node(self, parent, nodename, value, attribute=none, cdata=false):
node = self.dom.createelement(nodename)
if value:
if cdata:
nodedata = self.dom.createcdatasection(value)
else:
nodedata = self.dom.createtextnode(value)
node.appendchild(nodedata)
if attribute and isinstance(attribute, dict):
for key, value in attribute.items():
node.setattribute(key, value)
try:
parentnode = self.__get_spec_node(parent)
except:
print 'get parent node fail, use the root as parent node'
parentnode = self.root
parentnode.appendchild(node)
def write_start_time(self, time):
self.write_node('/','starttime', time)
def write_end_time(self, time):
self.write_node('/','endtime', time)
def write_pass_count(self, count):
self.write_node('/','passcount', count)
def write_fail_count(self, count):
self.write_node('/','failcount', count)
def write_case(self):
self.write_node('/','case', none)
def write_case_no(self, index, value):
self.write_node('/case[%s]/' % index,'no', value)
def write_case_url(self, index, value):
self.write_node('/case[%s]/' % index,'url', value)
def write_case_dbdata(self, index, value):
self.write_node('/case[%s]/' % index,'dbdata', value)
def write_case_apidata(self, index, value):
self.write_node('/case[%s]/' % index,'apidata', value)
def write_case_dbsql(self, index, value):
self.write_node('/case[%s]/' % index,'dbsql', value, cdata=true)
def write_case_apixpath(self, index, value):
self.write_node('/case[%s]/' % index,'apixpath', value)
def save_xml(self):
myfile = file(self.resultfile, 'w')
self.dom.writexml(myfile, encoding='utf-8')
myfile.close()
if __name__ == '__main__':
xr = xmlwrite(r'd:\test.xml')
xr.write_start_time('2223')
xr.write_end_time('444')
xr.write_pass_count('22')
xr.write_fail_count('33')
xr.write_case()
xr.write_case()
xr.write_case_no(0, '0')
xr.write_case_url(0, 'http://www.google.com')
xr.write_case_url(0, 'http://www.google.com')
xr.write_case_dbsql(0, 'select * from ')
xr.write_case_dbdata(0, 'dbtata')
xr.write_case_apixpath(0, '/xpath')
xr.write_case_apidata(0, 'apidata')
xr.write_case_no(1, '1')
xr.write_case_url(1, 'http://www.baidu.com')
xr.write_case_url(1, 'http://www.baidu.com')
xr.write_case_dbsql(1, 'select 1 from ')
xr.write_case_dbdata(1, 'dbtata1')
xr.write_case_apixpath(1, '/xpath1')
xr.write_case_apidata(1, 'apidata1')
xr.save_xml()
以上封装了minidom,支持通过xpath来写节点,不支持xpath带属性的匹配,但支持带索引的匹配。
比如:/root/child[1], 表示root的第2个child节点。
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