值我想:属性集而不LXML XML
<div data-a>
但LXML API似乎给我的只有这一点:
<div data-a=''>
我如何获得价值少的属性?
令人讨厌的是,空值和空值由LXML表示为空字符串。
设置None值没有帮助。
In [19]: from lxml.html import fromstring, tostring
In [20]: b = fromstring('<body class="meow" data-a="haha" data-b data-x="">text-fef27e87389e466fb99b5421629323f6</body>')
In [21]: b.attrib
Out[21]: {'data-a': 'haha', 'data-x': '', 'data-b': '', 'class': 'meow'}
In [22]: b = fromstring('<body class="meow" data-a="haha" data-b data-x="">text-fef27e87389e466fb99b5421629323f6</body>')
In [23]: b.attrib
Out[23]: {'data-a': 'haha', 'data-x': '', 'data-b': '', 'class': 'meow'}
In [24]: b.attrib['data-y'] = None
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-24-1f55133e3dc4> in <module>()
----> 1 b.attrib['data-y'] = None
/usr/lib/python2.7/dist-packages/lxml/etree.so in lxml.etree._Attrib.__setitem__ (src/lxml/lxml.etree.c:58775)()
/usr/lib/python2.7/dist-packages/lxml/etree.so in lxml.etree._setAttributeValue (src/lxml/lxml.etree.c:19025)()
/usr/lib/python2.7/dist-packages/lxml/etree.so in lxml.etree._utf8 (src/lxml/lxml.etree.c:26460)()
TypeError: Argument must be bytes or unicode, got 'NoneType'
tag.attrib['data-a'] = None
TypeError: Argument must be bytes or unicode, got 'NoneType'
请出示一个示范最少的代码。 [问] – boardrider