Python ElementTree子节点从一棵树到另一棵树

Question

我有多个xml文件，布局非常相似。

在下面的示例中，我对xml树1，对象1进行了一些更改，我想将这些更改复制到xml树2和3：

示例XMLS：

<example_data>
  <object class="example" id="xml_tree_1">
    <object class="multi_object" id="object_1">
      <style many_attributes="stuff_and_changes"/>
      <object class="object_1" id="random_12">
        <style many_attributes="things"/>
      </object>
      <object class="object_2" id="random_21">
        <style many_attributes="things"/>
      </object>
    </object>
    <object class="object_1" id="object_2">
      <style many_attributes="stuff"/>
    </object>
  </object>
</example_data>

<example_data>
  <object class="example" id="xml_tree_2">
    <object class="multi_object" id="object_1">
      <style many_attributes="stuff"/>
      <object class="object_1" id="random_23">
        <style many_attributes="stuff"/>
      </object>
      <object class="object_2" id="random_32">
        <style many_attributes="stuff"/>
      </object>
    </object>
    <object class="object_1" id="object_2">
      <style many_attributes="stuff"/>
    </object>
  </object>
</example_data>

<example_data>
  <object class="example" id="xml_tree_3">
    <object class="multi_object" id="object_1">
      <style many_attributes="stuff"/>
      <object class="object_1" id="random_45">
        <style many_attributes="stuff"/>
      </object>
      <object class="object_2" id="random_54">
        <style many_attributes="stuff"/>
      </object>
    </object>
    <object class="object_1" id="object_2">
      <style many_attributes="stuff"/>
    </object>
  </object>
</example_data>

在对一棵树进行了一些更改后，如何将这些更改复制到其他树？

我不知道如何开始。

示例PYTHON：

import os
import xml.etree.ElementTree as et


all_trees = {}


def main():

  generate_trees("path_to_xmls")

  copy_style_attributes_to_all_trees("object_1", "xml_tree_1")

  write_trees()


def copy_style_attributes_to_all_trees(object_id, source):

  for key in all_trees:
    tree = all_trees[key]

    for dest in tree.iter("object"):
      if (dest.get("id") == object_id):
        # copy object 1 (and inner objects) style from source to dest object
        # I have no idea how to do this


def generate_trees(directory):

  for root, dirs, files in os.walk(directory):
    for f in files:
      if f.endswith(".xml"):
        fpath = os.path.join(root, f)
        tree = et.parse(fpath)
        all_trees[fpath] = tree


def get_tree(filename):
  for key in all_trees:
    if (key.find(filename) != -1):
      return all_trees[key]
  return None


def write_trees():

  for fpath in all_trees:
    all_trees[fpath].write(fpath)


if __name__ == '__main__':
  main()

应该怎么做？