{"id":6481,"date":"2014-09-06T03:21:29","date_gmt":"2014-09-06T03:21:29","guid":{"rendered":"https:\/\/dev.railscarma.com\/scraping-of-web-sites-using-mechanize-gem\/"},"modified":"2022-08-30T09:18:09","modified_gmt":"2022-08-30T09:18:09","slug":"scraping-di-siti-web-utilizzando-la-gemma-meccanizzata","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/it\/blog\/articoli-tecnici\/scraping-di-siti-web-utilizzando-la-gemma-meccanizzata\/","title":{"rendered":"Scraping di siti Web utilizzando Mechanize Gem"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6481\" class=\"elementor elementor-6481\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1355bdca elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1355bdca\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-65c23262\" data-id=\"65c23262\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a27b432 elementor-widget elementor-widget-text-editor\" data-id=\"a27b432\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: justify;\" align=\"JUSTIFY\"><strong><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Raschiamento del web<\/span><\/span><\/em><\/strong><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\"> (web Harvesting o Web Data Extraction) \u00e8 una tecnica software per computer che consente di estrarre informazioni dai siti Web. La libreria Mechanize viene utilizzata per automatizzare l&#039;interazione con i siti Web. Mechanize gem memorizza e invia automaticamente cookie, segue reindirizzamenti e pu\u00f2 seguire collegamenti e inviare moduli. <\/span><\/span><\/span><\/em><\/p>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">I campi del modulo possono essere compilati e inviati. Tiene inoltre traccia dei siti che hai visitato come cronologia. Sfrutta Nokogiri per analizzare una pagina alla ricerca dei moduli e dei pulsanti pertinenti e fornisce un&#039;interfaccia semplificata per manipolare un modulo web.<\/span><\/span><\/span><\/em><\/p>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><a name=\"label-Dependencies\"><\/a><strong><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Dipendenze<\/span><\/span><\/strong><\/p>\n<ul style=\"text-align: justify;\">\n<li>\n<p style=\"font-style: normal; font-weight: normal;\"><span style=\"font-size: medium;\">rubino 1.8.7, 1.9.2 o 1.9.3<\/span><\/p>\n<\/li>\n<li>\n<p style=\"font-style: normal; font-weight: normal;\"><span style=\"font-size: medium;\">Nokogiri<\/span><\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Iniziare con Mechanize:<\/span><\/span><\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Prendiamo una pagina!<\/span><\/span><\/span><\/strong><\/p>\n<p style=\"font-style: normal; font-weight: normal; text-align: justify;\"><span style=\"font-size: medium;\">La prima cosa \u00e8 la prima. Assicurati di aver richiesto la meccanizzazione e di istanziare un nuovo oggetto meccanizzazione:<\/span><\/p>\n<pre class=\"western\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">richiedono &quot;rubygems&quot;<\/span><\/span><\/span><\/em>\n<span style=\"font-size: medium;\">richiedere &quot;meccanizzare&quot;<\/span>\n\n<span style=\"font-size: medium;\">agente = Meccanizza.nuovo<\/span>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Ora utilizzeremo l&#039;agente che abbiamo creato per recuperare una pagina. Prendiamo Google con il nostro agente meccanizzato:<\/span><\/span><\/span><\/em>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">pagina = agente.get (&#039;<\/span><\/span><\/span><\/em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">http:\/\/google.com\/<\/span><\/span><\/span><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">')<\/span><\/span><\/span><\/em>\n\n<strong><a name=\"label-Finding+Links\"><\/a><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Trovare collegamenti<\/span><\/span><\/strong><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Mechanize restituisce un oggetto pagina ogni volta che ottieni una pagina, pubblichi o invii un modulo. Quando viene recuperata una pagina, l&#039;agente analizzer\u00e0 la pagina e inserir\u00e0 un elenco di collegamenti nell&#039;oggetto della pagina.<\/span><\/span><\/span><\/em><\/p>\n<p style=\"font-style: normal; font-weight: normal; text-align: justify;\"><span style=\"font-size: medium;\">Ora che abbiamo recuperato la home page di Google, proviamo a elencare tutti i collegamenti:<\/span><\/p>\n<pre class=\"western\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">page.links.each fa |link|<\/span><\/span><\/span><\/em>\n  <span style=\"font-size: medium;\">inserisce link.text<\/span>\n<span style=\"font-size: medium;\">FINE<\/span><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Possiamo elencare i collegamenti, ma Mechanize fornisce alcune scorciatoie per aiutarci a trovare un collegamento su cui fare clic. Diciamo che vogliamo fare clic sul collegamento il cui testo \u00e8 &quot;Notizie&quot;. Normalmente dovremmo fare cos\u00ec:<\/span><\/span><\/span><\/em><\/p>\n<pre class=\"western\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">pagina = agent.page.links.find { |l| l.text == &#039;Notizie&#039; }.click (o)<\/span><\/span><\/span><\/em>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">page = agent.page.link_with(:text =&gt; &#039;Notizie&#039;).click (o)<\/span><\/span><\/span><\/em>\n<em><span style=\"font-family: Liberation Serif,serif;\"><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">agent.page.links_with(:text =&gt; &#039;Notizie&#039;)[1].click (o)<\/span><\/span><\/span><\/span><\/em>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">page.link_with(:href =&gt; &#039;\/qualcosa&#039;).<\/span><\/span><\/span><\/em>\n\n<a name=\"label-Filling+Out+Forms\"><\/a><strong><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Compilazione di moduli<\/span><\/span><\/strong><\/pre>\n<p style=\"font-style: normal; font-weight: normal; text-align: justify;\"><span style=\"font-size: medium;\">Continuiamo con il nostro esempio su Google. Ecco il codice che abbiamo finora:<\/span><\/p>\n<pre class=\"western\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">richiedono &quot;rubygems&quot;<\/span><\/span><\/span><\/em>\n<span style=\"font-size: medium;\">richiedere &quot;meccanizzare&quot;<\/span>\n\n<span style=\"font-size: medium;\">agente = Meccanizza.nuovo<\/span>\n<span style=\"font-size: medium;\">pagina = agent.get(&#039;http:\/\/google.com\/&#039;)<\/span><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Se stampiamo bene la pagina, possiamo vedere che c&#039;\u00e8 un modulo chiamato &quot;f&quot;, che ha un paio di pulsanti e alcuni campi:<\/span><\/span><\/span><\/em><\/p>\n<pre class=\"western\" style=\"margin-bottom: 0.5cm;\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">pagina pp<\/span><\/span><\/span><\/em><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Ora che conosciamo il nome del modulo, prendiamolo dalla pagina:<\/span><\/span><\/span><\/em><\/p>\n<pre class=\"western\" style=\"margin-bottom: 0.5cm;\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">google_form = pagina.form(&#039;f&#039;)<\/span><\/span><\/span><\/em><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Vediamo insieme il codice:<\/span><\/span><\/span><\/em><\/p>\n<pre class=\"western\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">richiedono &quot;rubygems&quot;<\/span><\/span><\/span><\/em>\n<span style=\"font-size: medium;\">richiedere &quot;meccanizzare&quot;<\/span>\n\n<span style=\"font-size: medium;\">agente = Meccanizza.nuovo<\/span>\n<span style=\"font-family: Liberation Serif,serif;\"><span style=\"font-size: medium;\">pagina = agent.get(&#039;http:\/\/google.com\/&#039;)<\/span><\/span>\n<span style=\"font-size: medium;\">google_form = pagina.form(&#039;f&#039;)<\/span>\n<span style=\"font-size: medium;\">google_form.q = &#039;rubino meccanizzato&#039;<\/span>\n<span style=\"font-size: medium;\">pagina = agente.submit(google_form)<\/span>\n<span style=\"font-size: medium;\">pagina pp<\/span>\n\n<strong><a name=\"label-Scraping+Data\"><\/a><span style=\"font-size: medium;\"><span style=\"font-style: normal;\">Raschiamento dei dati <\/span><\/span><\/strong>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">Mechanize utilizza Nokogiri per analizzare l&#039;HTML. Che cosa significa questo per te? Puoi trattare una pagina meccanizzata come un oggetto nokogiri. Dopo aver utilizzato Mechanize per accedere alla pagina che devi raschiare, quindi raschiala utilizzando i metodi nokogiri:<\/span><\/span><\/span><\/em>\n<em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">agent.get(&#039;http:\/\/someurl.com\/&#039;).search(&quot;p.posted&quot;)<\/span><\/span><\/span><\/em><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">L&#039;espressione data a Mechanize::Page#search pu\u00f2 essere un&#039;espressione CSS o un&#039;espressione XPath:<\/span><\/span><\/span><\/em><\/p>\n<pre class=\"western\" style=\"margin-bottom: 0.5cm;\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">agent.get(&#039;http:\/\/someurl.com\/&#039;).search(&quot;.\/\/p[@class=&#039;posted&#039;]&quot;)<\/span><\/span><\/span><\/em><\/pre>\n<p style=\"text-align: justify;\" align=\"JUSTIFY\"><em><span style=\"font-size: medium;\"><span style=\"font-style: normal;\"><span style=\"font-weight: normal;\">La libreria Mechanize viene utilizzata per automatizzare l&#039;interazione con i siti Web. Mechanize gem memorizza e invia automaticamente cookie, segue reindirizzamenti e pu\u00f2 seguire collegamenti e inviare moduli. I campi del modulo possono essere compilati e inviati. Tiene inoltre traccia dei siti che hai visitato come cronologia. sfrutta Nokogiri per analizzare una pagina per i moduli e i pulsanti pertinenti e fornisce un&#039;interfaccia semplificata per manipolare un modulo web.<\/span><\/span><\/span><\/em><\/p>\n<p><strong><a href=\"https:\/\/www.railscarma.com\/it\/\" target=\"_blank\" rel=\"noopener noreferrer\">RailsCarma<\/a><\/strong> ha lavorato sul framework Ruby on Rails sin dalla sua fase nascente e se ne \u00e8 occupato <strong>250 RdR<\/strong> <strong>progetti<\/strong>. Con un team di oltre 100 sviluppatori RoR esperti nelle tecniche e negli strumenti pi\u00f9 recenti, RailsCarma \u00e8 adatto per aiutarti con tutte le tue esigenze di sviluppo.<\/p>\n<p>Siamo felici di aiutarvi con le vostre domande. Utilizza il nostro <a href=\"\/it\/contattaci\/\" target=\"_blank\" rel=\"noopener noreferrer\">Contattaci<\/a> pagina per connetterti con noi.<\/p>\n<p>Leggi articoli correlati:<\/p>\n<ul>\n<li><a href=\"\/it\/blog\/binari-3\/introduzione-guide-api\/\" target=\"_blank\" rel=\"noopener noreferrer\">Un&#039;introduzione all&#039;API Rails<\/a><\/li>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/poodle-ssl-security-threat-explored\/\" target=\"_blank\" rel=\"noopener noreferrer\">Esplorata la minaccia alla sicurezza SSL di Poodle<\/a><\/li>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/a-simple-way-to-increase-the-performance-of-your-rails-app-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">Un modo semplice per aumentare le prestazioni della tua app Rails<\/a><\/li>\n<li><a href=\"\/it\/blog\/articoli-tecnici\/applicazioni-scalabili-con-connessione-multipla-a-database\/\" target=\"_blank\" rel=\"noopener noreferrer\">Applicazione scalabile con connessione multipla a database<\/a><\/li>\n<\/ul>\n<p><a href=\"\/it\/contattaci\/\">Mettiti in contatto con noi.<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4f453ac elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4f453ac\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-28473f67\" data-id=\"28473f67\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7171339f elementor-widget elementor-widget-heading\" data-id=\"7171339f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Iscriviti per gli ultimi aggiornamenti<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2e9b63 elementor-widget elementor-widget-shortcode\" data-id=\"e2e9b63\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t\t\t\t<script type=\"text\/javascript\">\n\t\t\t\t\t\tvar gCaptchaSibWidget;\n                        var onloadSibCallbackInvisible = function () {\n\n                            var element = document.getElementsByClassName('sib-default-btn');\n                            var countInvisible = 0;\n                            var indexArray = [];\n                            jQuery('.sib-default-btn').each(function (index, el) {\n                                if ((jQuery(el).attr('id') == \"invisible\")) {\n                                    indexArray[countInvisible] = index;\n                                    countInvisible++\n                                }\n                            });\n\n                            jQuery('.invi-recaptcha').each(function (index, el) {\n                                grecaptcha.render(element[indexArray[index]], {\n                                    'sitekey': jQuery(el).attr('data-sitekey'),\n                                    'callback': sibVerifyCallback,\n                                });\n                            });\n                        };\n\t\t\t\t\t<\/script>\n\t\t\t\t\t                <script src=\"https:\/\/www.google.com\/recaptcha\/api.js?onload=onloadSibCallbackInvisible&render=explicit\" async defer><\/script>\n\t\t\t\t\n\t\t\t<form id=\"sib_signup_form_1\" method=\"post\" class=\"sib_signup_form\" action=\"\">\n\t\t\t\t<div class=\"sib_loader\" style=\"display:none;\"><img\n\t\t\t\t\t\t\tsrc=\"https:\/\/www.railscarma.com\/wp-includes\/images\/spinner.gif\" alt=\"caricatore\"><\/div>\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_action\" value=\"subscribe_form_submit\">\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_id\" value=\"1\">\n                <input type=\"hidden\" name=\"sib_form_alert_notice\" value=\"Please fill out this field\">\n                <input type=\"hidden\" name=\"sib_form_invalid_email_notice\" value=\"Your email address is invalid\">\n                <input type=\"hidden\" name=\"sib_security\" value=\"ec95fb1fc4\">\n\t\t\t\t<div class=\"sib_signup_box_inside_1\">\n\t\t\t\t\t<div style=\"\/*display:none*\/\" class=\"sib_msg_disp\">\n\t\t\t\t\t<\/div>\n                                            <div id=\"sib_captcha_invisible\" class=\"invi-recaptcha\" data-sitekey=\"6LdikOAaAAAAAJ6SWrrKVQrtw7TQpQAEnv0HS0G3\"><\/div>\n                    \t\t\t\t\t<p class=\"sib-email-area\">\r\n    <label class=\"sib-email-area\"><\/label>\r\n    <input type=\"email\" class=\"sib-email-area\" name=\"email\" required=\"required\" placeholder=\"Indirizzo e-mail\">\r\n<\/p>\r\n<p class=\"sib-NAME-area\">\r\n    <label class=\"sib-NAME-area\"><\/label>\r\n    <input type=\"text\" class=\"sib-NAME-area\" name=\"NAME\" placeholder=\"Nome\">\r\n<\/p>\r\n<p>\r\n    <input type=\"submit\" id=\"invisible\" class=\"sib-default-btn\" value=\"sottoscrivi\">\r\n<\/p>\t\t\t\t<\/div>\n\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"it\"\/><\/form>\n\t\t\t<style>\n\t\t\t\tform#sib_signup_form_1 p.sib-alert-message {\n    padding: 6px 12px;\n    margin-bottom: 20px;\n    border: 1px solid transparent;\n    border-radius: 4px;\n    -webkit-box-sizing: border-box;\n    -moz-box-sizing: border-box;\n    box-sizing: border-box;\n}\nform#sib_signup_form_1 p.sib-alert-message-error {\n    background-color: #f2dede;\n    border-color: #ebccd1;\n    color: #a94442;\n}\nform#sib_signup_form_1 p.sib-alert-message-success {\n    background-color: #dff0d8;\n    border-color: #d6e9c6;\n    color: #3c763d;\n}\nform#sib_signup_form_1 p.sib-alert-message-warning {\n    background-color: #fcf8e3;\n    border-color: #faebcc;\n    color: #8a6d3b;\n}\n\t\t\t<\/style>\n\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t  <div class=\"related-post slider\">\r\n        <div class=\"headline\">Articoli correlati<\/div>\r\n    <div class=\"post-list owl-carousel\">\r\n\r\n            <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"Gemma Kaminari\" href=\"https:\/\/www.railscarma.com\/it\/blog\/articoli-tecnici\/gemma-di-kaminari\/?related_post_from=37277\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" 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The Mechanize library is used for automating interaction with websites. Mechanize gem automatically stores and sends cookies, follows redirects, and can follow links and submit forms. Form fields can be populated and submitted. It also keeps track &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/it\/blog\/how-to-build-a-scalable-saas-platform-using-ruby-on-rails\/\"> <span class=\"screen-reader-text\">Come costruire una piattaforma SaaS scalabile usando Ruby on Rails<\/span> Leggi altro \"<\/a><\/p>","protected":false},"author":1,"featured_media":32090,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[384],"tags":[572,573,574,575,576],"class_list":["post-6481","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles","tag-gem","tag-mechanize","tag-mechanize-gem","tag-web-harvesting","tag-web-scraping"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Scraping of Websites using Mechanize Gem - RailsCarma Blog<\/title>\n<meta name=\"description\" content=\"Web scraping is a computer software technique of extracting information from websites. 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