Sean Carolan wrote:
>> Thank you, this is helpful. Minidom is confusing, even the
>> documentation confirms this:
>> "The name of the functions are perhaps misleading...."
>>
>>> But I'd start with the etree tutorial (of which
>>> there are many variations on the web):
>
> Ok, so I read through these tutorials and am at least able to print
> the XML output now. I did this:
>
> doc = etree.parse('computer_books.xml')
>
> and then this:
>
> for elem in doc.iter():
> print elem.tag, elem.text
>
> Here's the data I'm interested in:
>
> index 1
> field 11
> value 9780596526740
> datum
>
> How do you say, "If the field is 11, then print the next value"? The
> raw XML looks like this:
>
> <datum>
> <index>1</index>
> <field>11</field>
> <value>9780470286975</value>
> </datum>
>
> Basically I just want to pull all these ISBN numbers from the file.
With http://lxml.de/ you can use xpath:
$ cat computer_books.xml
<foo>
<bar>
<datum>
<index>1</index>
<field>11</field>
<value>9780470286975</value>
</datum>
</bar>
</foo>
$ cat read_isbn.py
from lxml import etree
root = etree.parse("computer_books.xml")
print root.xpath("//datum[field=11]/value/text()")
$ python read_isbn.py
['9780470286975']
$
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