How can I associate xml text with a preceding empty element in Python?

Question

I have inherited some xml that I need to process in Python. I am using xml.etree.cElementTree, and I am having some trouble associating text that occurs after an empty element with that empty element's tag. The xml is quite a bit more complicated than I what I have pasted below, but I have simplified it to make the problem clearer (I hope!).

The result I would like to have is a dict like this:

DESIRED RESULT

{(9, 1): 'As they say, A student has usually three maladies:', (9, 2): 'poverty, itch, and pride.'}

The tuples can also contain strings (e.g., ('9', '1')). I really don't care at this early stage.

Here is the XML:

test1.xml

<div1 type="chapter" num="9">
  <p>
    <section num="1"/> <!-- The empty element -->
      As they say, A student has usually three maladies: <!-- Here lies the trouble -->
    <section num="2"/> <!-- Another empty element -->
      poverty, itch, and pride.
  </p>
</div1>

WHAT I HAVE TRIED

Attempt 1

>>> import xml.etree.cElementTree as ET
>>> tree = ET.parse('test1.xml')
>>> root = tree.getroot()
>>> chapter = root.attrib['num']
>>> d = dict()
>>> for p in root:
    for section in p:
        d[(int(chapter), int(section.attrib['num']))] = section.text


>>> d
{(9, 2): None, (9, 1): None}    # This of course makes sense, since the elements are empty

Attempt 2

>>> for p in root:
    for section, text in zip(p, p.itertext()):    # unfortunately, p and p.itertext() are two different lengths, which also makes sense
        d[(int(chapter), int(section.attrib['num']))] = text.strip()


>>> d
{(9, 2): 'As they say, A student has usually three maladies:', (9, 1): ''}

As you can see in the latter attempt, p and p.itertext() are two different lengths. The value of (9, 2) is the value I am trying to associate with key (9, 1), and the value I want to associate with (9, 2) does not even show up in d (since zip truncates the longer p.itertext()).

Any help would be appreciated. Thanks in advance.

ChrisP · Accepted Answer · 2013-12-21 21:48:45Z

1

Have you tried using .tail?

import xml.etree.cElementTree as ET

txt = """<div1 type="chapter" num="9">
         <p>
           <section num="1"/> <!-- The empty element -->
             As they say, A student has usually three maladies: <!-- Here lies the trouble -->
           <section num="2"/> <!-- Another empty element -->
             poverty, itch, and pride.
         </p>
         </div1>"""
root = ET.fromstring(txt)
for p in root:
    for s in p:
        print s.attrib['num'], s.tail

answered Dec 21, 2013 at 21:48

ChrisP

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1 Comment

user3079064 Over a year ago

Brilliant. Worked like a charm. Thanks.

jterrace · Accepted Answer · 2013-12-21 21:59:39Z

0

I would use BeautifulSoup for this:

from bs4 import BeautifulSoup

html_doc = """<div1 type="chapter" num="9">
  <p>
    <section num="1"/>
      As they say, A student has usually three maladies:
    <section num="2"/>
      poverty, itch, and pride.
  </p>
</div1>"""

soup = BeautifulSoup(html_doc)

result = {}
for chapter in soup.find_all(type='chapter'):
    for section in chapter.find_all('section'):
      result[(chapter['num'], section['num'])] = section.next_sibling.strip()

import pprint
pprint.pprint(result)

This prints:

{(u'9', u'1'): u'As they say, A student has usually three maladies:',
 (u'9', u'2'): u'poverty, itch, and pride.'}

answered Dec 21, 2013 at 21:59

jterrace

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