Python解析生成XML-ElementTree VS minidom
OS：Windows 7
关键字：Python3.4，XML，ElementTree，minidom
本文介绍用Python解析生成以下XML：
<Persons><Person>
<Name>LDL</Name>
<Description Language='English'><![CDATA[cdata text]]></Description>
</Person>
<Person>
<Name>China</Name>
<Description Language='English'><![CDATA[cdata text]]></Description>
</Person>
</Persons>
1.创建一个xml文件名为src.xml，内容如上，放到c:\temp
2.使用ElementTree读取src.xml，并创建一个内容相同的xml名为target-tree.xml。
ElementTreeSample.py如下：
# -*- coding: utf-8 -*-"""
Sample of xml.etree.ElementTree
@author: ldlchina
"""
import os
import sys
import logging
import traceback
import xml.etree.ElementTree as ET
import time
def copy_node(src_node, target_node):
# Copy attr
for key in src_node.keys():
target_node.set(key, src_node.get(key))
if len(list(src_node)) > 0:
for child in src_node:
target_child = ET.Element(child.tag)
target_node.append(target_child)
copy_node(child, target_child)
else:
target_node.text = src_node.text
def read_write_xml(src, target):
tree = ET.parse(src)
root = tree.getroot()
target_root = ET.Element(root.tag)
start_time = time.time() * 1000
copy_node(root, target_root)
end_time = time.time() * 1000
print('copy_node:' + str(end_time - start_time))
target_tree = ET.ElementTree(target_root)
target_tree.write(target)
logging.info(target)
def main():
try:
current_file = os.path.realpath(__file__)
# Configure logger
log_file = current_file.replace('.py', '.log')
logging.basicConfig(filename = log_file, filemode = 'w', level = logging.INFO)
# Create console handler
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
logger = logging.getLogger('')
logger.addHandler(ch)
#src = sys.argv[1]
#target = sys.argv[2]
# For debugging
src = 'C:/temp/src.xml'
target = 'C:/temp/target-tree.xml'
# Generate results
start_time = time.time() * 1000
read_write_xml(src, target)
end_time = time.time() * 1000
print('read_write_xml:' + str(end_time - start_time))
except:
logging.exception(''.format(traceback.format_exc()))
input('Press any key to exit...')
main()
3.使用minidom读取src.xml，并创建一个内容相同的xml名为target-dom.xml。
MinidomSample.py如下：
# -*- coding: utf-8 -*-"""
Sample of xml.dom.minidom
@author: ldlchina
"""
import os
import sys
import logging
import traceback
import xml.dom.minidom as MD
import time
def get_text(n):
nodelist = n.childNodes
rc = ""
for node in nodelist:
if node.nodeType == node.TEXT_NODE or node.nodeType == node.CDATA_SECTION_NODE:
rc = rc + node.data
return rc
def copy_node(target_doc, src_node, target_node):
if not isinstance(src_node, MD.Document) and src_node.hasAttributes():
for item in src_node.attributes.items():
target_node.setAttribute(item[0], item[1])
for node in src_node.childNodes:
if node.nodeType == node.TEXT_NODE:
target_child = target_doc.createTextNode(node.nodeValue)
target_node.appendChild(target_child)
elif node.nodeType == node.CDATA_SECTION_NODE:
target_child = target_doc.createCDATASection(node.nodeValue)
target_node.appendChild(target_child)
elif node.nodeType == node.ELEMENT_NODE:
target_child = target_doc.createElement(node.nodeName)
target_node.appendChild(target_child)
copy_node(target_doc, node, target_child)
def read_write_xml(src, target):
doc = MD.parse(src)
target_doc = MD.Document()
start_time = time.time() * 1000
copy_node(target_doc, doc, target_doc)
end_time = time.time() * 1000
print('copy_node: ' + str(end_time - start_time))
# Write to file
f = open(target, 'w')
f.write(target_doc.documentElement.toxml())
f.close()
logging.info(target)
def main():
try:
current_file = os.path.realpath(__file__)
# Configure logger
log_file = current_file.replace('.py', '.log')
logging.basicConfig(filename = log_file, filemode = 'w', level = logging.INFO)
# Create console handler
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
logger = logging.getLogger('')
logger.addHandler(ch)
#src = sys.argv[1]
#target = sys.argv[2]
# For debugging
src = 'C:/temp/src.xml'
target = 'C:/temp/target-dom.xml'
# Generate results
start_time = time.time() * 1000
read_write_xml(src, target)
end_time = time.time() * 1000
print('read_write_xml: ' + str(end_time - start_time))
except:
logging.exception(''.format(traceback.format_exc()))
input('Press any key to exit...')
main()
4.运行ElementTreeSample.py，得到XML如下：
<Persons><Person><Name>LDL</Name><Description Language="English">cdata text</Description></Person><Person><Name>China</Name><Description Language="Chinese">cdata text</Description></Person></Persons>
5.运行MinidomSample.py，得到XML如下：
<Persons><Person>
<Name>LDL</Name>
<Description Language="English"><![CDATA[cdata text]]></Description>
</Person>
<Person>
<Name>China</Name>
<Description Language="Chinese"><![CDATA[cdata text]]></Description>
</Person>
</Persons>
ElementTree VS minidom：
1.ElementTree执行速度会比minidom快一些。
2.ElemenTree不能分析XML的转行和缩进。minidom可以。
3.ElemenTree不支持CDATA，minidom可以。
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