Python XML add element to file -

i have 1000 xml files, , missing element. made script search through xml's , print element. wanted add ability add element if isnt there, unsuccessful.

as can see below, dvt3 isnt there , needs added.

my code

xmlparser = etree.xmlparser(remove_blank_text=true) f in os.listdir(directory):     if f.endswith(".xml"):          xmlfile = directory + '/' + f           tree = etree.parse(xmlfile, parser=xmlparser)         root = tree.getroot()          hardwarerevisionnode = root.find(".//hardwarerevision")          try:             print f + ' :   ' + hardwarerevisionnode.text         except exception e:             print str(e)             print xmlfile             #wearable = root.find(".//wearable")             childnode = etree.element(".//wearable")             childnode.text = "dvt2"             childnode.append(childnode)             tree.write(xmlfile, pretty_print=true) 

xml file

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> <speech>   <results>     <breakpoint name="asr_start_recognition" elapsedtime="00:00:00.000" />   </results>   <meta>     <dialog>       <sessionuuid>7c9b1e3a-b22f-4793-818f-72bc6e7b84a9</sessionuuid>     </dialog>     <asr>       <engine>         <name>rockhopper</name>         <version>1.0.0.61</version>       </engine>       <wrapper>         <name>rockhopperasrengine</name>         <version>1.8.2</version>       </wrapper>       <wrapper>         <name>core</name>         <version>1.8.2</version>       </wrapper>       <resource>         <name>language model</name>         <version>1.4.4</version>       </resource>     </asr>     <application>       <name>fightclub</name>       <version>0.1.550</version>       <commit>8f7a411</commit>       <builddate>2016-03-09t18:16z</builddate>       <branch>head</branch>     </application>     <wearable>       <firmware>1.0.183 - fcb1app000-1611w0183</firmware>     </wearable>   </meta> </speech> 

xml file want

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> <speech>   <results>     <breakpoint name="asr_start_recognition" elapsedtime="00:00:00.000" />   </results>   <meta>     <dialog>       <sessionuuid>7c9b1e3a-b22f-4793-818f-72bc6e7b84a9</sessionuuid>     </dialog>     <asr>       <engine>         <name>rockhopper</name>         <version>1.0.0.61</version>       </engine>       <wrapper>         <name>rockhopperasrengine</name>         <version>1.8.2</version>       </wrapper>       <wrapper>         <name>core</name>         <version>1.8.2</version>       </wrapper>       <resource>         <name>language model</name>         <version>1.4.4</version>       </resource>     </asr>     <application>       <name>fightclub</name>       <version>0.1.550</version>       <commit>8f7a411</commit>       <builddate>2016-03-09t18:16z</builddate>       <branch>head</branch>     </application>     <wearable>       <firmware>1.0.183 - fcb1app000-1611w0183</firmware>       <hardwarerevision>dvt3</hardwarerevision>     </wearable>   </meta> </speech> 

you can try out xmltodict.

import xmltodict x  open(myfile) f:      xmldictionary=x.parse(f.read(),'utf-8')     xmldictionary['speech']['meta']['wearable'].update({"hardwarerevision": "dvt3"})      output = x.unparse(xmldictionary)      open(outfile,'w') out:         out.write(output) 

make run in parallel if want, , if storage concern replace contents of files (or delete old ones immediatelly after new ones made).