Python and XML

Python and XML operations

First, Introduction

XML is a protocol that implements data exchange between different languages or programs, much like JSON, but JSON is simpler to use, but in the dark ages when JSON is not yet born, you can only choose XML, so many of the systems of traditional companies, such as the financial industry, are mostly XML.

Second, the structure

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

<?XML version= "1.0"?><Data>    <Countryname= "China">        <RankUpdated= "Yes">2</Rank>        < Year>2008</ Year>        <GDPPC>141100</GDPPC>        <Neighborname= "中文版"direction= "E"/>        <Neighborname= "Switzerland"direction= "W"/>    </Country>    <Countryname= "French">        <RankUpdated= "Yes">5</Rank>        < Year>2011</ Year>        <GDPPC>59900</GDPPC>        <Neighborname= "Malaysia"direction= "N"/>    </Country>    <Countryname= "Italy">        <RankUpdated= "Yes">69</Rank>        < Year>2011</ Year>        <GDPPC>13600</GDPPC>        <Neighborname= "Costa Rica"direction= "W"/>        <Neighborname= "Colombia"direction= "E"/>    </Country></Data>

Third, using XML in Python

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

1. Traverse XML

Importxml.etree.ElementTree as ET tree= Et.parse ("Xmltest.xml") Root=tree.getroot ()Print(Root.tag)#traversing an XML document forChildinchRoot:Print(Child.tag, Child.attrib) forIinchChild :Print(I.tag,i.text)#Traverse only the year node forNodeinchRoot.iter (' Year'):    Print(Node.tag,node.text)

2. Modify and delete XML document content

mport Xml.etree.ElementTree as ET tree= Et.parse ("Xmltest.xml") Root=tree.getroot ()#Modify forNodeinchRoot.iter (' Year'): New_year= Int (node.text) + 1Node.text=Str (new_year) Node.set ("Updated","Yes") Tree.write ("Xmltest.xml")  #Delete Node forCountryinchRoot.findall ('Country'): Rank= Int (Country.find ('Rank'). Text)ifRank > 50: Root.remove (country) tree.write ('Output.xml')

3. Create an XML document

ImportXml.etree.ElementTree as ET new_xml= ET. Element ("NameList") name= ET. Subelement (New_xml,"name", attrib={"enrolled":"Yes"}) age= ET. subelement (Name," Age", attrib={"checked":"No"}) Sex= ET. subelement (Name,"Sex") Sex.text=' -'name2= ET. Subelement (New_xml,"name", attrib={"enrolled":"No"}) age= ET. Subelement (Name2," Age") Age.text=' +'et= ET. ElementTree (New_xml)#Generating Document ObjectsEt.write ("Test.xml", encoding="Utf-8", xml_declaration=True) Et.dump (New_xml)#print the generated format

Python and XML