AttributeError: objet de type 'ElementTree' n'a pas d'attribut "tostring'

J'ai ce problème , AttributeError: type object 'ElementTree' has no attribute 'tostring', je ne sais pas ce qui est faux, je l'importation de chaîne, Il ne fonctionne pas.
Essayez de suivre un autre tuto mais, rien.

Est-il un autre moyen de convertir un ElementTree objet dans une chaîne XML?

import os
import re
import glob
from xml.dom import minidom
from time import strftime
from xml.etree.ElementTree import ElementTree
from xml.etree.ElementTree import Element, SubElement, Comment, tostring
date=strftime("%Y-%m-%dT%H:%M:%S")
os.chdir('/home/guillermo/TclsPy/XML_Level2/')
def prettify(elem):
"""Return a pretty-printed XML string for the Element.
"""
rough_string = ElementTree.tostring(elem, 'utf-8',method="xml" ,     short_empty_elements=True)
reparsed = minidom.parseString(rough_string)
return reparsed.toprettyxml(indent=" ")
for nameXml in glob.glob("*.xml"):
new_nameXml = re.sub(r'tlmy',r'AUX',nameXml,flags=re.IGNORECASE)
new_nameXml = re.sub('.xml','_AlarmEnabled.xml',new_nameXml, flags=re.IGNORECASE)#new_nameXml.lower().replace('.xml','_AlarmEnabled.xml')
match = re.search(r'TSL_TM_TLMY_(.+).xml', nameXml,flags= re.IGNORECASE )
if match:
#Si matchea el patron, guardamos en subsistema lo que esta entre ()
subsistema = match.group(1)
print "Nombre:", new_nameXml
print "Subsistema:", subsistema
else:
print "No matchea:", nameXml
# raw_input()
#<?xml version="1.0" encoding="UTF-8"?>
TSLFunction=Element('TSLFunction')
child = SubElement(TSLFunction, 'unit')
child.text = '<![CDATA[AUX]]>'
child1= SubElement(TSLFunction,'mnemonic')
child1.text='<![CDATA'+'['+'AUX::'+'AUX.'+subsistema.replace('.xml','')+'_AlarmEnabled]]'
child2=SubElement(TSLFunction, 'body')
child2.text='<![CDATA[out = true;]]>'
child3=SubElement(TSLFunction,'description')
child3.text='<![CDATA[--]]>'
child4=SubElement(TSLFunction,'name')
child4.text='<![CDATA['+subsistema+'_AlarmEnabled'+']]'
child5=SubElement(TSLFunction,'minorVersion')
child5.text='0'
child6=SubElement(TSLFunction,'majorVersion')
child6.text='1'
child7=SubElement(TSLFunction,'lastUpdate')
child7.text=date
child8=SubElement(TSLFunction,'creationDate')
child8.text=date
child9=SubElement(TSLFunction,'checked')
child9.text='false'
returnchild=SubElement(TSLFunction,'return')
name=SubElement(returnchild,'name')
name.text='<![CDATA[out]]>'
returnType=SubElement(returnchild,'returnType')
returnType.text='boolean'
label=SubElement(returnchild,'label')
label.text='<![CDATA[--]]>'
parameters=SubElement(TSLFunction,'parameters')
subtype=SubElement(TSLFunction,'subtype')
subtype.text='<![CDATA[TM]]>'
prefix=SubElement(TSLFunction,'prefix')
prefix.text='<![CDATA[AUX]]>'
variable=SubElement(TSLFunction,'variable')
variable.text='<![CDATA['+subsistema +'_AlarmEnabled]]'
print (subsistema)
tree = ElementTree(prettify(TSLFunction))
tree.write('../Alarm/'+new_nameXml)enter code here

OriginalL'auteur Guillermo | 2013-09-20