André wrote:
> I've started using elementtree and don't understand how to use it to
> manipulate and replace nodes. I know how to do this using a simple,
> but inefficient parser I wrote, but I'd rather learn to use a better
> tool - especially as it is to be added to the standard library.
> Now, I would like to find all <pre> tags of the "text" class and
for pre in elem.getiterator("pre"):
or
for pre in elem.findall(".//pre"):
> 1. change the class value
pre.set("class", "value")
> 2. append another node ( <textarea> )
> 3. surround the both nodes by a third one ( <form> )
or in other words,
2. replace the <pre> with a <form> element that contains some
new contents derived from the old element
# 1) build the new form
form = Element("form")
e = SubElement(form, "pre")
e.set("class", "text2")
e.text = pre.text
e = SubElement(form, "textarea", cols=80, name="code")
e = SubElement(form, "input", type="submit")
# 2) mutate the pre element
pre.clear()
pre.tag = "form"
pre[:] = [form]
for harder cases, a common pattern is:
for parent in elem.getiterator():
for index, child in enumerate(parent.findall("pre")):
# the code in here can manipulate parent[i] and child
another approach is to build a parent map; see the parent_map code
at
http://effbot.org/zone/element.htm#the-element-type
</F>
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