Python module--xml

XML module

XML is a protocol that implements data exchange between different languages or programs, similar to JSON, but JSON is simpler to use.

However, in ancient times, in the dark years when JSON was not yet born, you can only choose to use XML, so far many traditional companies such as the financial industry, many systems interface is mainly XML.

The format of XML is as follows: by the <> node to distinguish the data structure.

<?XML version= "1.0"?><Data>    <Countryname= "Liechtenstein">        <RankUpdated= "Yes">2</Rank>        < Year>2008</ Year>        <GDPPC>141100</GDPPC>        <Neighborname= "Austria"direction= "E"/>        <Neighborname= "Switzerland"direction= "W"/>    </Country>    <Countryname= "Singapore">        <RankUpdated= "Yes">5</Rank>        < Year>2011</ Year>        <GDPPC>59900</GDPPC>        <Neighborname= "Malaysia"direction= "N"/>    </Country>    <Countryname= "Panama">        <RankUpdated= "Yes">69</Rank>        < Year>2011</ Year>        <GDPPC>13600</GDPPC>        <Neighborname= "Costa Rica"direction= "W"/>        <Neighborname= "Colombia"direction= "E"/>    </Country></Data>

XML protocols are supported in each language, and in Python you can manipulate XML with the following modules

Traverse

ImportXml.etree.ElementTree as Ettree= Et.parse ("XML Test")#Open XML Fileroot = Tree.getroot ()#Get root node#Print (dir (root))Print(Root.tag)#traversing an XML document forChildinchRoot:Print('----------', Child.tag, Child.attrib)#Print Country Node     forIinchChild :Print(I.tag,i.text)

modifying and deleting XML document content

ImportXml.etree.ElementTree as Ettree= Et.parse ("xml_test") Root= Tree.getroot ()#f.seek (0)#Modify forNodeinchRoot.iter (' Year'): New_year= Int (node.text) + 5Node.text= str (new_year)#Modify ContentNode.set ("attr_test","false") Tree.write ('Output.xml')#Write File##删除node forCountryinchRoot.findall ('Country'): Rank= Int (Country.find ('Rank'). Text)ifRank > 50: Root.remove (country) tree.write ('Output.xml')

New XML

ImportXml.etree.ElementTree as Etroot= ET. Element ("NameList")#Create Rootname= ET. subelement (Root,"name", attrib={"enrolled":"Yes"})#Create Child--nameAge = ET. subelement (Name," Age", attrib={"checked":"No"})#Create name Child--age,sex,nameSex = ET. subelement (Name,"Sex") n= ET. subelement (Name,"name") N.text="Alex Li"Sex.text='male'name2= ET. subelement (Root,"name", attrib={"enrolled":"No"}) age= ET. Subelement (Name2," Age") Age.text=' +'et= ET. ElementTree (Root)#Generating Document ObjectsEt.write ("Build_out.xml", encoding="Utf-8", xml_declaration=true)

Because the native saved XML is not indented by default, if you want to set indentation, you need to modify the Save method

ImportXml.etree.ElementTree as ET fromXml.domImportMinidomdefsubelement (root, tag, text): Ele=ET. subelement (root, tag) Ele.text=textdefSaveXML (root, filename, indent="\ t", newl="\ n", encoding="Utf-8"): Rawtext=et.tostring (Root) Dom=minidom.parsestring (Rawtext) with open (filename,'W') as F:dom.writexml (F,"", indent, newl, encoding) root= ET. Element ("NameList") to= Root.makeelement (" to", {}) To.text="Peter"Root.append (to) name= ET. subelement (Root,"name", attrib={"enrolled":"Yes"})#Create Child--nameAge = ET. subelement (Name," Age", attrib={"checked":"No"})#Create name Child--age,sex,nameSex = ET. subelement (Name,"Sex") n= ET. subelement (Name,"name") N.text="Alex Li"Sex.text='male'name2= ET. subelement (Root,"name", attrib={"enrolled":"No"}) age= ET. Subelement (Name2," Age") Age.text=' +'#et = et. ElementTree (root) # Generate Document Object#Save the XML fileSaveXML (Root,"Note.xml")

Python module--xml