Python解析產生XML-ElementTree VS minidom

標籤：

OS：Windows 7

關鍵字：Python3.4，XML，ElementTree，minidom

 

本文介紹用Python解析產生以下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.建立一個xml檔案名稱為src.xml，內容如上，放到c:\temp

2.使用ElementTree讀取src.xml，並建立一個內容相同的xml名為target-tree.xml。

ElementTreeSample.py如下：

# -*- coding: utf-8 -*-"""Sample of xml.etree.ElementTree@author: ldlchina"""import osimport sysimport loggingimport tracebackimport xml.etree.ElementTree as ETimport timedef 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讀取src.xml，並建立一個內容相同的xml名為target-dom.xml。

MinidomSample.py如下：

# -*- coding: utf-8 -*-"""Sample of xml.dom.minidom@author: ldlchina"""import osimport sysimport loggingimport tracebackimport xml.dom.minidom as MDimport timedef 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 rcdef 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.運行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.運行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執行速度會比minidom快一些。

2.ElemenTree不能分析XML的轉行和縮排。minidom可以。

3.ElemenTree不支援CDATA，minidom可以。

Python解析產生XML-ElementTree VS minidom