使用Python的xml.dom.minidom

Question

我试着用Python的xml.dom.minidom，我得到以下错误：

>>> from xml.dom import minidom
>>> xdocument = minidom.Document()
>>> xrss = minidom.Element("rss")
>>> xdocument.appendChild(xrss)
<DOM Element: rss at 0xc1d0f8>
>>> xchannel = minidom.Element("channel")
>>> xrss.appendChild(xchannel)
Traceback (most recent call last):
  File "C:\Program Files\Wing IDE 3.2\src\debug\tserver\_sandbox.py", line 1, in ?
    # Used internally for debug sandbox under external interpreter
  File "c:\Python24\Lib\xml\dom\minidom.py", line 123, in appendChild
    _clear_id_cache(self)
  File "c:\Python24\Lib\xml\dom\minidom.py", line 1468, in _clear_id_cache
    node.ownerDocument._id_cache.clear()
AttributeError: 'NoneType' object has no attribute '_id_cache'
>>> 

有人知道为什么吗？在

Answer 1

将xdocument.appendChild(xrss)替换为xrss = xdocument.appendChild(xrss)。从docs：

Node.appendChild(newChild) Add a new child node to this node at the end of the list of children, returning newChild. If the node was already in in the tree, it is removed first.

所以您需要将xrss分配给从appendChild返回的元素。在

Answer 2

{cd1>创建新元素。这是在DOM中执行此操作的标准方法。在