Python minidom: #text node disappears when appending it to new parent node

问题

I have XML that looks like this:

<example>
     <para>
         <phrase>child_0</phrase>
         child_1
         <phrase>child_2</phrase>
     </para>
</example>

and I want it to look like this:

<foo>
    <phrase>child_0</phrase>
    child_1
    <phrase>child_2</phrase>
</foo>

Simple, right? I create a new parent node -- <foo> -- and then iterate through the <para> node and append the children to the new <foo> node.

What's strange is that the child_1 (a text node) disappears when I try to do so. If I simply iterate through the <para> node, I get this:

>>> for p in para.childNodes:
        print p.nodeType
1
3
1

So there are 3 child nodes, and the middle one is the text node. But when I try to append it to the new <foo> node, it doesn't make it.

>>> for p in para.childNodes:
        foo_node.appendChild(p)

>>> print foo_node.toprettyxml()
<foo>
    <phrase>child_0</phrase>
    <phrase>child_2</phrase>
</foo>

What the @#$%&*! is going on?

回答1:

Well, here I am, answering my own question.

The appendChild() function removes the child node from the <para> list of nodes, so you will be effectively skipping every other element as the index gets out of sync with each iteration. The solution is to append a copy of the node:

for p in para.childNodes:
    p_copy = p.cloneNode(deep=True)
    foo_node.appendChild(p_copy)

来源：https://stackoverflow.com/questions/38859341/python-minidom-text-node-disappears-when-appending-it-to-new-parent-node