New submission from karl <karl+pythonb...@la-grange.net>:
In XPath 1.0 The function contains() is available > Function: boolean contains(string, string) > The contains function returns true if the first argument string contains the > second argument string, and otherwise returns false. In https://www.w3.org/TR/1999/REC-xpath-19991116/#function-contains ``` <body> <p class="doc">One attribute: doc</p> <p class="doc test">Two Attributes: doc test</p> <p class="test">One Attribute: test</p> </body> ``` Currently, we can do this ``` >>> from lxml import etree >>> root = etree.fromstring("""<body> ... <p class="doc">One attribute</p> ... <p class="doc test">Two Attributes: doc test</p> ... <p class="doc2 test">Two Attributes: doc2 test</p> ... </body> ... """) >>> elts = root.xpath("//p[@class='doc']") >>> elts, etree.tostring(elts[0]) ([<Element p at 0x102670900>], b'<p class="doc">One attribute</p>\n ') ``` One way of extracting the list of 2 elements which contains the attribute doc with XPath is: ``` >>> root.xpath("//p[contains(@class, 'doc')]") [<Element p at 0x1026708c0>, <Element p at 0x102670780>] >>> [etree.tostring(elt) for elt in root.xpath("//p[contains(@class, 'doc')]")] [b'<p class="doc">One attribute: doc</p>\n ', b'<p class="doc test">Two Attributes: doc test</p>\n '] ``` There is no easy way to extract all elements containing a "doc" value in a multi-values attribute in python 3.10 with xml.etree, which is quite common in html. ``` >>> import xml.etree.ElementTree as ET >>> root = ET.fromstring("""<body> ... <p class="doc">One attribute: doc</p> ... <p class="doc test">Two Attributes: doc test</p> ... <p class="test">One Attribute: test</p> ... </body>""" ... ) >>> root.xpath("//p[contains(@class, 'doc')]") Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'xml.etree.ElementTree.Element' object has no attribute 'xpath' ``` ---------- components: Library (Lib) messages: 379185 nosy: karlcow priority: normal severity: normal status: open title: xml.etree should support contains() function type: enhancement versions: Python 3.10 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42104> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
