New submission from py.user:
It is possible to create and serialize an Element instance with empty string
tag value:
>>> import xml.etree.ElementTree as etree
>>>
>>> root = etree.Element('')
>>> elem = etree.SubElement(root, '')
>>>
>>> root
<Element '' at 0xb744e34c>
>>> elem
<Element '' at 0xb744e374>
>>>
>>> etree.tostring(root)
b'<>< /></>'
>>> etree.dump(root)
<>< /></>
>>>
It is possible to create and serialize an Element instance with None tag value:
>>> import xml.etree.ElementTree as etree
>>>
>>> root = etree.Element(None)
>>> elem = etree.SubElement(root, None)
>>>
>>> root
<Element None at 0xb7468c34>
>>> root[0]
<Element None at 0xb746334c>
>>> len(root)
1
>>> etree.tostring(root)
b''
>>> etree.dump(root)
>>>
And same try with site package lxml raises an exception both for empty string
and for None:
>>> import lxml.etree
>>>
>>> lxml.etree.Element('')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "lxml.etree.pyx", line 2809, in lxml.etree.Element
(src/lxml/lxml.etree.c:61393)
File "apihelpers.pxi", line 87, in lxml.etree._makeElement
(src/lxml/lxml.etree.c:13390)
File "apihelpers.pxi", line 1446, in lxml.etree._getNsTag
(src/lxml/lxml.etree.c:25978)
File "apihelpers.pxi", line 1481, in lxml.etree.__getNsTag
(src/lxml/lxml.etree.c:26304)
ValueError: Empty tag name
>>>
>>> lxml.etree.Element(None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "lxml.etree.pyx", line 2809, in lxml.etree.Element
(src/lxml/lxml.etree.c:61393)
File "apihelpers.pxi", line 87, in lxml.etree._makeElement
(src/lxml/lxml.etree.c:13390)
File "apihelpers.pxi", line 1446, in lxml.etree._getNsTag
(src/lxml/lxml.etree.c:25978)
File "apihelpers.pxi", line 1464, in lxml.etree.__getNsTag
(src/lxml/lxml.etree.c:26114)
File "apihelpers.pxi", line 1342, in lxml.etree._utf8
(src/lxml/lxml.etree.c:24770)
TypeError: Argument must be bytes or unicode, got 'NoneType'
>>>
----------
components: Library (Lib), XML
messages: 277125
nosy: py.user
priority: normal
severity: normal
status: open
title: In xml.etree.ElementTree Element can be created with empty and None tag
type: behavior
versions: Python 3.6
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28236>
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