使用 lxml 将多个元素添加到 xml

Question

我想在 xml 树的父元素中添加一些子元素。来源 XML 是：

<catalog>
    <element>
        <collection_list />
    </element>
    <element>
        <collection_list />
    </element>
</catalog>

我试过 python 3 中的以下代码：

from lxml import etree
tree = etree.parse('source.xml')
root = tree.getroot()

elementCollections = tree.xpath('/catalog/element/collection_list')

for element in elementCollections:
    childElement = etree.SubElement(element, "collection")
    listOfElementCollections = ['c1', 'c2', 'c3']

    for elementCollection in listOfElementCollections:
        childElement.text = elementCollection

newtree = etree.tostring(tree, encoding='utf-8')
newtree = newtree.decode("utf-8")
print(newtree)

但不是：

<catalog>
    <element>
        <collection_list>
            <collection>c1</collection>
            <collection>c2</collection>
            <collection>c3</collection>
        </collection_list>
    </element>
    <element>
        <collection_list>
            <collection>c1</collection>
            <collection>c2</collection>
            <collection>c3</collection>
        </collection_list>
    </element>
</catalog>

我有这样的结果：

<catalog>
    <element>
        <collection_list>
            <collection>c3</collection>
        </collection_list>
    </element>
    <element>
        <collection_list>
            <collection>c3</collection>
        </collection_list>
    </element>
</catalog>

请解释一下如何在树中插入多个元素。

编辑： "childElement".

的固定标签名称

Answer 1

使用此代码：

from lxml import etree
tree = etree.parse('source.xml')
root = tree.getroot()

elementCollections = tree.xpath('/catalog/element/collection_list')

for element in elementCollections:
    childElement = etree.SubElement(element, "collectionName")
    listOfElementCollections = ['c1', 'c2', 'c3']

    for elementCollection in listOfElementCollections:
        childElement2 = etree.SubElement(childElement, "collection")
        childElement2.text = elementCollection

newtree = etree.tostring(tree, encoding='utf-8')
newtree = newtree.decode("utf-8")
print(newtree)

您需要在循环中创建新元素。

Answer 2

您需要在内部 for 循环而不是外部循环中添加集合：

for element in elementCollections:
    listOfElementCollections = ['c1', 'c2', 'c3']

    for elementCollection in listOfElementCollections:
        childElement = etree.SubElement(element, "collection")
        childElement.text = elementCollection

newtree = etree.tostring(root, encoding='utf-8')
newtree = newtree.decode("utf-8")
print newtree

使用 lxml 将多个元素添加到 xml

Add multiple elements to xml with lxml

python

xml

lxml