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 () ) 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 3 4 5 Alphabet
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:
6 7 8 ABC
How to use XPath wildcards to select unknown XML nodes?To mitigate this issue in IE, set all SelectionLanguages ββto 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.
9 10 11 Alphabet 12
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Proizoshla Oshibka S Nezaregistrirovannoj Funkciej Selektora Xpath
Ocorreu Um Erro Com A Funcao Nao Registrada Do Seletor Xpath
Si E Verificato Un Errore Con La Funzione Non Registrata Del Selettore Xpath
Wystapil Blad Z Niezarejestrowana Funkcja Selektora Xpath
Es Ist Ein Fehler Mit Der Nicht Registrierten Funktion Des Xpath Selektors Aufgetreten
Hubo Un Error Con La Funcion No Registrada Del Selector Xpath
Det Uppstod Ett Fel Med Den Oregistrerade Funktionen For Xpath Selector
Il Y A Eu Une Erreur Avec La Fonction Non Enregistree Du Selecteur Xpath