Question

根据ElementTree docs，Element()的界面需要attrib个关键字参数。

class xml.etree.ElementTree.Element(tag, attrib={}, **extra)

以下解释......

    attrib is an optional dictionary, containing element attributes.

现在这对我有用，如使用Python 2.7和ElementTree所描述的那样。例如

>>> import xml.etree.ElementTree as ET
>>> parent = ET.Element("parent")
>>> attribs = {'age': '20', 'name': 'Steve'}
>>> child = ET.SubElement(parent, "child", attrib=attribs)
>>> ET.dump(parent)
<parent><child age="20" name="Steve" /></parent>

但是，当我运行相同的脚本但导入cElementTree实现时，会引发TypeError异常。

File "attrib.py", line 17, in <module>
  ET.dump(parent)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1165, in dump
  elem.write(sys.stdout)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 821, in write
  serialize(write, self._root, encoding, qnames, namespaces)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 940, in _serialize_xml
  _serialize_xml(write, e, encoding, qnames, None)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 933, in _serialize_xml
  v = _escape_attrib(v, encoding)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1093, in _escape_attrib
  _raise_serialization_error(text)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1053, in _raise_serialization_error
  "cannot serialize %r (type %s)" % (text, type(text).__name__)
TypeError: cannot serialize {'age': '20', 'name': 'Steve'} (type dict)

我在这里缺少什么？有趣的是，如果我只是将attribs字典作为位置参数传递，则cElementTree代码可以正常工作。

>>> import xml.etree.cElementTree as ET
>>> parent = ET.Element("parent")
>>> attribs = {'age': '20', 'name': 'Steve'}
>>> child = ET.SubElement(parent, "child", attribs)
>>> ET.dump(parent)
<parent><child age="20" name="Steve" /></parent>

我发现了一个与此相关的bug listed on bugs.python.org - 但它已关闭，无法解决问题。为什么C实现的行为不同？有没有关于这个的文件我错过了。感谢

使用cElementTree传递attrib kwarg时不一致

0 个答案: