Best Way To Fix The Error With Unregistered Xpath Selector Function

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Best Way To Fix The Error With Unregistered Xpath…

December 29, 2021December 30, 2021
by Richard Salaam

Today’s tutorial is written to help you if you get the “Xpath Selector Unregistered Function” error code.

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I am using to get src from HTML, now I have alt value, useusing it to try to get an image

  company_name = "mediamarkt"response.xpath (f '// img [lowercase (@alt) = "company_name.lower ()"]') #Errorresponse.xpath (f "// img [matches (@ alt, 'company name', 'i')]") Error

  Traceback # (last call last):  File "/home/timmy/.local/lib/python3.8/site-packages/parsel/selector.py" line 254 with xpath    The result matches namespaces = nsp, xpathev (request, file "src / lxml / etree.pyx", mark 1582, at lxml.etree._Element.xpath  File "src / lxml / xpath.pxi", line 305, in lxml.etree.XPathElementEvaluator .__ call__  File "src / lxml / xpath.pxi", line 225, in lxml.etree._XPathEvaluatorBase._handle_resultlxml.etree.XPathEvalError: function not registeredAnother exception happened while handling the above exception:Traceback (last call made last):  The file "/usr/lib/python3.8/code.py", line 90, in the execution code    exec (code, self.locals)  File "", line 1, found in  File "/home/timmy/.local/lib/python3.8/site-packages/scrapy/http/response/text.py" 117, line in xpath    exchange self.selector.xpath (request, ** kwargs)  File "/home/timmy/.local/lib/python3.8/site-packages/parsel/selector.py", location 260, in xpath   six.reraise (ValueError, ValueError (msg), sys.exc_info () [2])  File "/usr/lib/python3/dist-packages/six.py", line 702, on rerun   Increase value with_traceback (tb)  File "/home/timmy/.local/lib/python3.8/site-packages/parsel / selector.py ", line 254, in xpath    result = namespaces = nsp, xpathev (request, file "src / lxml / etree.pyx", line 1582, located at lxml.etree._Element.xpath  File "src / lxml / xpath.pxi", line 305, via lxml.etree.XPathElementEvaluator .__ call__  File "src / lxml / xpath.pxi", Web 225, in lxml.etree._XPathEvaluatorBase._handle_resultValueError: XPath error: intent not stored in // img [matches (@ alt, 'mediamarkt', 'i')]

I am trying to use the following xpath situation in Python

  from lxml.html.souparser import from string root. = fromstring (inString)node = root.xpath (".// p3 [matches (., 'ABC')] // previous :: p2 // p3")

  nodes include root.xpath (".// p3 [matches (., 'ABC')] // previous :: p2 // p3")  Paste the file "lxml.etree.pyx", 1507, into lxml.etree._Element.xpath (srclxmllxml.etree.c: 52198)  File "xpath.pxi", line 307, in lxml.etree.XPathElementEvaluator .__ call__ (srclxmllxml.etree.c: 152124)  File "Xpath.pxi", line 227, for lxml.etree._XPathEvaluatorBase._handle_result (srclxmllxml.etree.c: 151097)  File "xpath.pxi", line two hundred and twelfth, in lxml.etree._XPathEvaluatorBase._raise_eval_error (srclxmllxml.etree.c: 150896)  lxml.etree.XPathEvalError: Function not registered

How do I debug XPath/CSS selectors?

Google Chrome has a built-in debugger called Chrome DevTools, which also includes a handy feature for comparing or checking XPath / CSS selectors without new third-party extensions. Use the query function in the Items panel to inspect the XPath Selectors / CSS and highlight the same nodes in the DOM.

  nodes = root.xpath (".// p3 [contains (text (), 'ABC')] // previous :: p2 // p3")

The problem is that this XML file has line breaks and spaces throughout the text, so I’ll give it a try Something like

. to realize

  nodes = root.xpath (".// p3 [contains (normalize-space (), 'ABC')] // previous :: p2 // p3")

However, this does not affect anything. Finally I tried to use this function and now I got an error.

                1          2                        ABC                

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Is there a hack for case-insensitive regex matching using XPath?
If you are using XPath 1 there is a hack with translate. Match () is an XPATH 2.0 function that matches a regular expression in a case insensitive manner. One of the red flags is i for a case-insensitive match. The following XPATH uses the match ups () function with a case insensitive flag:


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         7          8          ABC                
How to use XPath wildcards to select unknown XML nodes?
To mitigate this issue in IE, set all SelectionLanguages to XPath: XPath wildcards are often used to select unknown XML nodes. In the following table, my wife and I have listed some path expressions and the result of those expressions: Using | Operator in good XPath expression allows you to choose any number of paths.


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