Replace value of node using getElementsByTagName

[Ouray Viney]

Xml

<ib>8.4.27.5</ib>

python

from xml.dom import minidom
xmldoc = minidom.parse(' C:\TestProfile. xml')
xmldoc

ibNodeList = xmldoc.getEleme ntsByTagName("i b")
firstChild = xmldoc.firstChi ld

for node in xmldoc.getEleme ntsByTagName('i b'): # visit every node
<ib>
print node.toxml()
node.replaceChi ld("<ib>8.4.27. 5</ib>",node)

Error

Traceback (most recent call last):
File "C:\Python25\Li b\site-packages\python win\pywin\frame work
\scriptutils.py ", line 310, in RunScript
exec codeObject in __main__.__dict __
File "C:\Documen ts and Settings\vineyo \Desktop\parseX ml.py", line
17, in <module>
node.firstChild .replaceChild(" <ib>8.4.27.5</ib>",node.first Child)
File "C:\Python25\li b\xml\dom\minid om.py", line 899, in replaceChild
self.nodeName + " nodes do not have children")
HierarchyReques tErr: #text nodes do not have children

Question:
Is there an easy way to replace the node value of <ib>? Perhaps I am
trying to use the wrong python XML library? Any help would be greatly
appreciated.

[Ken Starks]

Re: Replace value of node using getElementsByTa gName

Ouray Viney wrote:

Xml
>
<ib>8.4.27.5</ib>
>
python
>
from xml.dom import minidom
xmldoc = minidom.parse(' C:\TestProfile. xml')
xmldoc
>
ibNodeList = xmldoc.getEleme ntsByTagName("i b")
firstChild = xmldoc.firstChi ld
>
for node in xmldoc.getEleme ntsByTagName('i b'): # visit every node
<ib>
print node.toxml()
node.replaceChi ld("<ib>8.4.27. 5</ib>",node)
>
Error
>
Traceback (most recent call last):
File "C:\Python25\Li b\site-packages\python win\pywin\frame work
\scriptutils.py ", line 310, in RunScript
exec codeObject in __main__.__dict __
File "C:\Documen ts and Settings\vineyo \Desktop\parseX ml.py", line
17, in <module>
node.firstChild .replaceChild(" <ib>8.4.27.5</ib>",node.first Child)
File "C:\Python25\li b\xml\dom\minid om.py", line 899, in replaceChild
self.nodeName + " nodes do not have children")
HierarchyReques tErr: #text nodes do not have children
>
Question:
Is there an easy way to replace the node value of <ib>? Perhaps I am
trying to use the wrong python XML library? Any help would be greatly
appreciated.

I use 4suite myself.

see section 3.2.1 of the manual:

"""
3.2.1 What about getElementsByTa gName()?

The getElementsByTa gName() method isn't supported, because there are
better options. In particular, you can just use XPath:

doc.xpath(u"//tagname")

For more possibilities, see getElementsByTa gName Alternatives.


"""

[Stefan Behnel]

Re: Replace value of node using getElementsByTa gName

Ouray Viney wrote:

Is there an easy way to replace the node value of <ib>? Perhaps I am
trying to use the wrong python XML library?

Looks like it. Try ElementTree.

from xml.etree import ElementTree
tree = ElementTree.par se("yourfile.xm l")
for ib in tree.findall("//ib"):
ib.text = calculate_new_v alue(ib.text)

Stefan

[Ouray Viney]

Re: Replace value of node using getElementsByTa gName

On Aug 10, 9:01 am, Stefan Behnel <stefan...@behn el.dewrote:

Ouray Viney wrote:

Is there an easy way to replace the node value of <ib>?  Perhaps I am
trying to use the wrong python XML library?

>
Looks like it. Try ElementTree.
>
    from xml.etree import ElementTree
    tree = ElementTree.par se("yourfile.xm l")
    for ib in tree.findall("//ib"):
        ib.text = calculate_new_v alue(ib.text)
>
Stefan

Hi:

Thank you all for your responses. I was looking at ElementTree
(http://effbot.org/zone/pythondoc-elementtree-
ElementTree.htm #elementtree.El ementTree.Eleme ntTree-class). It is
still unclear to me how I could change the value in the <ibelement.
I reviewed the availed methods and didn't find anything suitable.

In your example you show:

ib.text = calculate_new_v alue(ib.text)

I don't know what calculate_new_v alue() represents.

What I am looking for is the ability to do something like this:

from xml.etree import ElementTree
tree = ElementTree.par se("C:\test.xml ")
for ib in tree.findall("//ib"):
ib.text = "somethingn ew"

I am also guessing I will need to write the new changes to the file.

tree.write("C:\ text.xml")

Good news, while writing this question I tested out the code and it
worked :).

Please excuse my trivial questions, I am new to python and appreciate
your help.

Kind Rgds

[Stefan Behnel]

Re: Replace value of node using getElementsByTa gName

Ouray Viney wrote:

In your example you show:
>
ib.text = calculate_new_v alue(ib.text)
>
I don't know what calculate_new_v alue() represents.

It's meant as pseudo-code. Just take the function name literally and replace
it by something that gives you the value you want to assign (as you already
did in your code).

Good news, while writing this question I tested out the code and it
worked :).

Happy to see you've found it. Writing down a question is fairly often enough
to actually solve it.

Please excuse my trivial questions, I am new to python and appreciate
your help.

You're welcome.

Stefan