'''import xml.etree.ElementTree as etreeElementTree is default python module, but it is slow, function is limitedso , we can import etree from lxml, it has the same api.'''from lxml import etree'''import lxml.etree as etreeit has the same function like above'''def getinfo1(path):    tree = etree.parse(path)    root = tree.getroot()    print('========root========')    print(root)    print(len(root))    print('=======tag============')    print(root.tag)    print('=========child===========')    for child in root:        print(child)    print('======attribute=========')    print(root.attrib)    print('======attribute1========')    print(root[0].attrib)    print(root[1].attrib)    print('======findall=========')    all1=root.findall('{http://www.w3.org/2005/atom}title')    print(all1)        print(all1[0].find('{http://www.w3.org/2005/atom}des'))    print(len(all1))    '''    findall, return list    find, return the first matched    '''    print('==========findall2==================')    all2=tree.findall('//{http://www.w3.org/2005/atom}*[@href]')    print(all2)    '''    // means all xml file, not just root or its children    * means any item    [@href] means include href as attribute    '''def writeinfo1(path):    root = etree.Element('root', lang='en')    sub1=etree.SubElement(root, 'title', color='##FFFFFF')    sub2= etree.SubElement(root, 'author', color = '##000000')    sub2.set('color','##AAAAAA')    sub1.set('type','text/html')    sub1.text='the content of title will be added'    print(etree.tostring(root, pretty_print=True))    with open(path, mode='wb') as file:        file.write(etree.tostring(root))if __name__ == '__main__':    getinfo1('xml_util.xml')    writeinfo1('xml_util2.xml')