[Tutor] XML parsing

[Asif Iqbal]

On Thu, Mar 29, 2018 at 3:56 AM, Peter Otten <__peter__ at web.de> wrote:

> Asif Iqbal wrote:
>
> > I am trying to extract all the *template-name*s, but no success yet
> >
> > Here is a sample xml file
> >
> > <collection xmlns:y="http://tail-f.com/ns/rest">
> >   <template-metadata xmlns="http://networks.com/nms">
> >     <template-name>ALLFLEX-BLOOMINGTON</template-name>
> >     <type>post-staging</type>
> >     <device-type>full-mesh</device-type>
> >     <provider-tenant>ALLFLEX</provider-tenant>
> >     <subscription xmlns="http://networks.com/nms">
> >       <solution-tier>advanced-plus</solution-tier>
> >       <bandwidth>1000</bandwidth>
> >       <is-analytics-enabled>true</is-analytics-enabled>
> >       <is-primary>true</is-primary>
> >     </subscription>
> > ....
> > </collection>
> >
> > with open('/tmp/template-metadata') as f:
> >     import xml.etree.ElementTree as ET
> >     root = ET.fromstring(f.read())
> >
> > print len(root)
> > print root[0][0].text
> > for l in root.findall('template-metadata'):
> >     print l
> >
> >
> > 392
> > ALLFLEX-BLOOMINGTON
> >
> >
> > It prints the length of the tree and the first element of the first
> child,
> > but when I try to loop through to find all the 'template-name's
> > it does not print anything.
> >
> > What am I doing wrong?
>
> You have to include the namespace:
>
> for l in root.findall('{http://networks.com/nms}template-metadata'):
>

How do I extract the 'template-name' ?

This is what I tried

 for l in root.findall('{http://networks.com/nms}template-metadata'):
    print l.find('template-name').text

I am following the doc
https://docs.python.org/2/library/xml.etree.elementtree.html section
19.7.1.3 findall example

I get this error attribute error 'NoneType' object has no attribute text. I
do not understand why l.find('template-name') is NoneType.

Here is complete code with output.


import xml.etree.ElementTree as ET

xmlfile='''
<collection xmlns:y="http://tail-f.com/ns/rest">
  <template-metadata xmlns="http://networks.com/nms">
    <template-name>ALLFLEX-BLOOMINGTON</template-name>
    <type>post-staging</type>
    <device-type>full-mesh</device-type>
    <provider-tenant>ALLFLEX</provider-tenant>
    <subscription xmlns="http://networks.com/nms">
      <solution-tier>advanced-plus</solution-tier>
      <bandwidth>1000</bandwidth>
      <is-analytics-enabled>true</is-analytics-enabled>
      <is-primary>true</is-primary>
    </subscription></template-metadata></collection>'''

root = ET.fromstring(xmlfile)
print root.tag
print root[0][0].text
for l in root.findall('{http://networks.com/nms}template-metadata'):
    print l.find('template-name').text

collection
ALLFLEX-BLOOMINGTON

---------------------------------------------------------------------------AttributeError
                           Traceback (most recent call
last)<ipython-input-18-73bd6770766a> in <module>()     19 print
root[0][0].text     20 for l in
root.findall('{http://networks.com/nms}template-metadata'):---> 21
print l.find('template-name').text
AttributeError: 'NoneType' object has no attribute 'text'





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-- 
Asif Iqbal
PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?