replacing string in xml file--revisited

[half.italian at gmail.com]

On May 10, 12:56 am, saif.shak... at gmail.com wrote:
> Hi,
>      I need to replace a string in xml file with something else.Ex
>
> - <SERVICEPARAMETER id="_775" Semantics="subfunction" DDORef="_54">
>   <SHORTNAME>rate</SHORTNAME>
>   <LONGNAME>rate</LONGNAME>
>   <VALUE role="constant" DataType="unsigned" value="1" />
>   <BYTEPOSITION role="position" BytePos="1" />
>   </SERVICEPARAMETER>
> - <SERVICEPARAMETER id="_776" Semantics="localId" DDORef="_54">
>
>                                      Here i have opened an xml
> file(small part is pasted here).I want to replace the word 'localId'
> with 'dataPackageID' wherever it comes in xml file.I have asked this
> before and got a code:
> input_file = open(filename)
> xmlcontents = input_file.read()
> input_file.close()
> xmlcontents = xmlcontents.replace("spam", "eggs")
> output_file = open(filename,"w")
> output_file.write(xmlcontents)
> output_file.close()
>
>                                  Although this works alone it is nto
> working when i handle multiple file I/O.Is there a alternative to do
> this.(maybe without read() operation)
>                                  Thanks

After reading your post again, this might be better:

#!/usr/bin/env python

from elementtree import ElementTree as et
tree = et.parse("testxml.xml")

for t in tree.getiterator("SERVICEPARAMETER"):
	if t.get("Semantics") == "localId":
		t.set("Semantics", "dataPackageID")

tree.write("output.xml")

~Sean