python - Beautifulsoup xml -

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i trying use code add xml tree simple info, have in table. each file has id need add it. corresp dictionary has file name , id couples. there empty element in xml, called idno[@type='tm'] in need enter corresponding id number.

from bs4 import beautifulsoup  dir = 'files/' corresp = {"00100004":"362375", "00100005":"362376", "00100006":"362377", "00100007":"362378"}  filename, tm in corresp.iteritems():     soup = beautifulsoup(open(dir + filename + ".xml"))      tmid = soup.find("idno", type="tm")     tmid.append(tm)     print soup

my first problem some time works, time says 

tmid.append(tm) attributeerror: 'nonetype' object has no attribute 'append'

i have no idea why. yesterday evening run same sample code , complains in way.

i have tried etree

import xml.etree.elementtree et dir = 'files/' corresp = {"00100004":"362375", "00100005":"362376", "00100006":"362377", "00100007":"362378"} filename, tm in corresp.iteritems():         f = open(dir + filename + ".xml")         tree = et.parse(f)         tmid = tree.findall("//idno[@type='tm']")         tmid.append(tm)         tree.write('output.xml', encoding='utf-8', xml_declaration=true)

but says "no element found: line 1, column 0"

my second, related problem when did work, not able write output file. ideally write file modifying.

thank advise on this.

for first question:

find() returns result. if find() can’t find anything, returns none. both result , none not python list, not have append() method.

check doc: http://www.crummy.com/software/beautifulsoup/bs4/doc/


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