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toParse = strip(tree.xpath('//n[@ssrModel:]'))[0, len(strip(tree.xpath('//n[@ssrModel:]'))) - 1]
File "src\lxml\etree.pyx", line 1582, in 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_result
lxml.etree.XPathEvalError: Invalid expression
привет ,в чем может быть проблема?