Parsing xml file in python

[J. Clifford Dyer]

On Tue, Oct 30, 2007 at 11:45:17AM -0700, amjadcsu at gmail.com wrote regarding Re: Parsing xml file in python:

Top-posting corrected....

> 
> 
> 
> On Oct 30, 12:32 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > amjad... at gmail.com schrieb:
> >
> >
> >
> > > I am a newbie in python
> > > I am trying to parse a xml file and write its content in a txt file.
> > > The txt contains null elements. Any reason what  iam doing wrong here
> >
> > > Here is the code that i wrote
> >
> > > import sys,os
> > > import xml.sax
> > > import xml.sax.handler
> > > from xml.sax.handler import ContentHandler
> > > from xml.sax import make_parser
> >
> > > class gmondxmlparse (ContentHandler):
> >
> > >     def __init__(self,searchTerm):
> > >         self.searchTerm=searchTerm;
> >
> > >     def startElement(self,name,attrs):
> >
> > >         if name=="HOST":
> > >             self.hostname=attrs.get('NAME',"")
> > >             self.IP=attrs.get('IP',"")
> > >         elif name=="METRIC":
> > >             self.metricname=attrs.get('NAME', "")
> > >             self.metricvalue=attrs.get('VAL',"")
> > >             self.metrictype=attrs.get('TYPE',"")
> > >             self.metricunit=attrs.get('UNITS',"")
> > >         return
> >
> > >     def endElement(self,name):
> > >         if name=="HOST" and self.searchTerm==self.hostname:
> > >             try:
> > >                 fh=open('/root/yhpc-2.0/ganglia.txt' ,'w')
> > >             except:
> > >                 print "File /root/yhpc-2.0/ganglia.txt can not be
> > > open"
> > >                 sys.exit(1)
> > >             fh.write("This is a test for xml parsing with python with
> > > chris and amjad \n")
> > >             fh.write("the host name is", self.hostname, "\n")
> > >             fh.write("the ip address is", self.IP, "\n")
> > >             fh.close()
> >
> > > searchTerm="HOST"
> > > parser=make_parser()
> > > curHandler=gmondxmlparse(searchTerm)
> > > parser.setContentHandler(curHandler)
> > > parser.parse(open("/root/yhpc-2.0/gmond.xml"))
> >
> > > Here is the sample of xml file
> >
> > > Here is the  xmk file called gmond.xml
> > > <HOST NAME="192.168.10.163" IP="192.168.10.163" REPORTED="1193689455"
> > > TN="0" TMAX="20" DMAX="0" LOCATION="unspecified"
> > > GMOND_STARTED="1193170061">
> > > <METRIC NAME="cpu_num" VAL="2" TYPE="uint16" UNITS="CPUs" TN="994"
> > > TMAX="1200" DMAX="0" SLOPE="zero" SOURCE="gmond"/>
> >
> > Without an actual error given, it's hard to know what your problem is.
> >
> > One thing though is noticable: your XML below isn't valid - XML has only
> > one root-element.
> >
> > And just for the record: it appears that you work under linux using a
> > root-account. Bad idea. Really.
> >
> > http://linuxbraindump.org/2007/08/13/the-10-commandments-for-new-linu...
> >
> > Diez
> 
> 
> That XML is just a snapshot
> I am not getting into the xml parser. The error is not generated but
> also the /root/yhpc-2.0/ganglia.txt does not contain anything.
> 

Well, if ganglia.txt contains nothing, and you received no output from the program, then either endElement never got called, or `if name=="HOST" and self.searchTerm==self.hostname:` never evaluated to true.  Because if you couldn't open for writing, you would have gotten the message you set up on the except block, and if you could, then even if your variables didn't contain any data, you would have seen the boilerplate text that you wrote.

Cheers,
Cliff

P.S. Please bottom-post when replying to the python list.  It sucks to have to look up and down a thread to see what's been said.