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Guía para principiantes al raspado de la web: proporcionado por Semalt

Web scraping es una técnica de extracción de información de los sitios web y blogs. Hay más de mil millones de páginas web en Internet, y el número está aumentando día a día, lo que hace que sea imposible para nosotros raspar datos manualmente. ¿Cómo puedes recolectar y organizar datos de acuerdo a tus requerimientos? En esta guía de raspado web, aprenderá sobre diferentes técnicas y herramientas.

En primer lugar, los webmasters o propietarios de sitios anotan sus documentos web con etiquetas y palabras clave de cola corta y larga cola que ayudan a los motores de búsqueda a entregar contenido relevante a sus usuarios. En segundo lugar, existe una estructura adecuada y significativa de cada página, también conocida como páginas HTML, y los desarrolladores y programadores usan una jerarquía de etiquetas semánticamente significativas para estructurar estas páginas.

Software o herramientas de raspado web:

En los últimos meses se ha lanzado una gran cantidad de software de raspado web o herramientas. Estos servicios acceden a la World Wide Web directamente con el Protocolo de transferencia de hipertexto o a través de un navegador web. Todos los raspadores web extraen algo de una página web o documento para utilizarlo con otro fin. Por ejemplo, Outwit Hub se utiliza principalmente para raspar números de teléfono, URL, texto y otros datos de Internet. Del mismo modo, Import.io y Kimono Labs son dos herramientas interactivas de raspado web que se utilizan para extraer documentos web y ayudar a extraer información de precios y descripciones de productos de sitios de comercio electrónico como eBay, Alibaba y Amazon. Además, Diffbot utiliza el aprendizaje automático y la visión por computadora para automatizar el proceso de extracción de datos. Es uno de los mejores servicios de web scraping en Internet y ayuda a estructurar su contenido de una manera adecuada.

Técnicas de raspado web:

En esta guía de raspado web, también aprenderá sobre las técnicas básicas de raspado web. Existen algunos métodos que utilizan las herramientas mencionadas anteriormente para evitar que elimine datos de baja calidad. Incluso algunas herramientas de extracción de datos dependen del análisis DOM, el procesamiento del lenguaje natural y la visión por computadora para recopilar contenido de Internet.

Sin duda, el raspado web es el campo con desarrollos activos, y todos los científicos de datos comparten un objetivo común y requieren avances en comprensión semántica, procesamiento de texto e inteligencia artificial.

Técnica n.° 1: Técnica de copiado y pegado humano:

A veces, incluso los mejores rascadores web no sustituyen el examen manual de los humanos y el de copiar y pegar. Esto se debe a que algunas páginas web dinámicas establecen las barreras para evitar la automatización de la máquina.

Técnica n.º 2: técnica de concordancia de patrones de texto:

Es una forma simple pero interactiva y poderosa de extraer datos de Internet y se basa en un comando grep de UNIX. Las expresiones regulares también facilitan a los usuarios raspar datos y se usan principalmente como parte de diferentes lenguajes de programación como Python y Perl.

Técnica n.° 3: Técnica de programación HTTP:

Los sitios estáticos y dinámicos son fáciles de identificar y los datos a partir de ese momento pueden recuperarse al publicar las solicitudes HTTP en un servidor remoto.

Técnica n.° 4: Técnica de análisis HTML:

Varios sitios tienen una enorme colección de páginas web generadas a partir de fuentes estructuradas subyacentes, como bases de datos. En esta técnica, un programa de raspado web detecta el HTML, extrae su contenido y lo traduce a la forma relacional (la forma racional se conoce como un envoltorio).

Jenny Jones
Thank you all for reading my article on 'Guía para principiantes al raspado de la web: proporcionado por Semalt'. I hope you find it helpful!
Carlos Ramirez
Great article, Jenny! As a beginner, I found your guide very informative. I have been wanting to learn web scraping for a while now, and this article provided a clear starting point for me. Thank you!
Jenny Jones
Thank you, Carlos! I'm glad you found the guide helpful. If you have any questions or need further assistance, feel free to ask!
Marta López
Semalt has always been my go-to resource for SEO-related topics. Good to see them sharing knowledge about web scraping as well. Jenny, great job with the guide!
Jenny Jones
Thank you, Marta! Semalt is indeed an excellent resource, and I'm glad you liked the guide. Let me know if there's anything specific you'd like to learn about web scraping!
David Liu
I've been using web scraping for data analysis in my research, and this guide provided some useful tips and techniques. Well done, Jenny!
Jenny Jones
Thank you, David! It's great to hear that the guide was useful for your research. If you have any specific use cases or questions, feel free to ask!
Laura Smith
Jenny, thank you for this comprehensive guide. I'm new to web scraping, but your explanations made it easier to understand the concepts. Excited to try scraping some data myself!
Jenny Jones
You're welcome, Laura! I'm happy to hear that the guide helped you grasp the concepts. Good luck with your web scraping projects, and don't hesitate to reach out if you need any assistance!
Juan Pérez
I appreciate the step-by-step approach in the guide. It made learning web scraping less intimidating for me. Semalt always delivers quality content!
Jenny Jones
Thank you, Juan! Breaking down the process into steps was to ensure beginners feel comfortable learning web scraping. Semalt truly values providing valuable content to its audience.
Sara Johnson
Jenny, your guide was very well-written and easy to follow. Web scraping can be overwhelming, but your explanations and examples made it much more approachable. Thank you!
Jenny Jones
You're welcome, Sara! I'm glad the guide helped you navigate through the complexities of web scraping. If you have any specific questions or need further assistance, feel free to ask!
Robert Thompson
Thank you for sharing valuable information, Jenny. This guide will surely benefit those who are new to web scraping. Semalt is always a reliable source!
Jenny Jones
Thank you, Robert! I'm glad you found the information valuable. Semalt is committed to providing reliable and helpful content to its audience. Let me know if there's anything specific you'd like to learn about web scraping!
Elena González
Jenny, I enjoyed reading your guide. It's concise yet covers all the important aspects of web scraping. Semalt always delivers quality content!
Jenny Jones
Thank you, Elena! I'm glad you found the guide concise and informative. Semalt's commitment to quality content is always our priority. If you have any further questions, feel free to ask!
Luis Martinez
I had some prior knowledge of web scraping, but your guide helped me fill in the gaps and understand the process better. Thanks for sharing, Jenny!
Jenny Jones
You're welcome, Luis! I'm glad the guide helped you fill in the gaps. If you ever need further clarification or have any specific questions, feel free to reach out!
Andrea Flores
Jenny, great guide! I appreciate the practical examples you provided, which helped solidify the concepts. Semalt always delivers valuable information!
Jenny Jones
Thank you, Andrea! Practical examples are essential for understanding complex topics like web scraping. Semalt is dedicated to providing valuable information to its audience. If you have any specific use cases or questions, feel free to ask!
Miguel Rodríguez
Web scraping can be a powerful tool when used ethically and responsibly. This guide is a great resource for beginners to get started on the right foot. Thanks, Jenny!
Jenny Jones
You're absolutely right, Miguel! Ethical and responsible use of web scraping is crucial. I'm glad you found the guide helpful in setting the right foundation for beginners. If you have any specific questions or concerns, feel free to ask!
Maria Garcia
Jenny, your guide was very beginner-friendly. The explanations were clear, and the examples made it easy to understand the concepts. Thank you!
Jenny Jones
You're welcome, Maria! I'm glad you thought the guide was beginner-friendly. Clear explanations and relatable examples are key to ensuring everyone can grasp the concepts. If you have any specific questions or need further assistance, feel free to ask!
Pedro Silva
I've been wanting to learn web scraping for my personal projects, and your guide has given me a solid starting point. Thanks for sharing, Jenny!
Jenny Jones
You're welcome, Pedro! I'm glad the guide provided you with a solid starting point for your web scraping projects. If you ever encounter any hurdles or have any specific questions, feel free to reach out!
Ana Morales
I appreciate how you explained the potential challenges and best practices in web scraping. It helped me anticipate and address potential roadblocks. Great work, Jenny!
Jenny Jones
Thank you, Ana! Addressing potential challenges and following best practices are crucial in successful web scraping. I'm glad the guide helped you anticipate and overcome roadblocks. If you have any specific questions or need further assistance, feel free to ask!
Óscar Fernández
This guide was exactly what I needed! I've been struggling with web scraping, but your explanations clarified many things. Thank you, Jenny!
Jenny Jones
You're welcome, Óscar! I'm glad the guide clarified many aspects of web scraping for you. If you have any specific questions or need further assistance in your journey, feel free to ask!
Isabella Russo
I bookmarked this guide for future reference. It covers all the essential elements and provides a solid foundation for beginners. Thank you, Jenny!
Jenny Jones
You're welcome, Isabella! I'm glad you found the guide bookmark-worthy. Having a solid foundation in web scraping is essential for future projects. If you have any specific questions or need further assistance, feel free to ask!
Gabriel López
I've been interested in learning web scraping for a while, and your guide made it seem less intimidating. Thanks, Jenny!
Jenny Jones
You're welcome, Gabriel! Making web scraping less intimidating was one of my goals with the guide. If you have any specific questions or need further assistance, feel free to ask!
Valentina Martínez
As a beginner, I found your guide very helpful. The step-by-step approach made it easy to follow, and the explanations were clear. Thank you, Jenny!
Jenny Jones
Thank you, Valentina! I'm glad you found the step-by-step approach and explanations helpful. Clear guidance is essential for beginners. If you have any specific questions or need further assistance, feel free to ask!
Lucas Fernández
Web scraping has always intrigued me, and this guide helped me understand the process better. Thanks for sharing your knowledge, Jenny!
Jenny Jones
You're welcome, Lucas! I'm glad the guide helped unravel the process behind web scraping. If you have any specific questions or need further assistance, feel free to ask!
Camila Costa
I'm starting a personal web scraping project, and your guide provided me with valuable insights and tips. Thank you, Jenny!
Jenny Jones
You're welcome, Camila! Best of luck with your web scraping project. If you encounter any challenges or have any specific questions, feel free to reach out!
Victor Santos
Great guide, Jenny! The examples and explanations were easy to follow, making it a fantastic resource for beginners like me. Thank you!
Jenny Jones
Thank you, Victor! I'm glad you found the examples and explanations easy to follow. Semalt aims to provide fantastic resources for beginners in various fields. If you have any specific questions or need further assistance, feel free to ask!
Natalia Silva
I appreciate how you emphasized the importance of ethical scraping and respecting the website's terms of service. Thanks for the guide, Jenny!
Jenny Jones
You're welcome, Natalia! Ethical scraping and respecting website terms are crucial aspects. I'm glad the guide highlighted their importance. If you have any specific questions or need further assistance, feel free to ask!
Eduardo Torres
Jenny, your guide was excellent. It provided a comprehensive overview of web scraping, and I learned a lot. Thank you!
Jenny Jones
Thank you, Eduardo! I'm glad the guide provided a comprehensive overview and helped you learn new things about web scraping. If you have any specific questions or need further assistance, feel free to ask!
Laura López
I've been looking for a beginner-friendly guide on web scraping, and I'm glad I came across yours. Well done, Jenny!
Jenny Jones
Thank you, Laura! I'm glad you found the guide beginner-friendly. If you have any specific questions or need further assistance on your web scraping journey, feel free to ask!
Santiago Rodríguez
The guide was well-structured and covered all the essential topics. It's a valuable resource for beginners getting started with web scraping. Thank you for sharing, Jenny!
Jenny Jones
You're welcome, Santiago! I'm glad you found the guide well-structured and comprehensive. Semalt strives to provide valuable resources for beginners in various domains. If you have any specific questions or need further assistance, feel free to ask!
Raquel García
Web scraping can be complicated, but your guide simplified it and made it accessible for beginners. Thank you for sharing your knowledge, Jenny!
Jenny Jones
You're welcome, Raquel! Simplifying complex topics like web scraping is one of my goals, and I'm glad you found the guide accessible. If you have any specific questions or need further assistance, feel free to ask!
Ricardo González
I found your guide very detailed, yet easy to follow. It's an excellent resource for beginners. Thank you, Jenny!
Jenny Jones
Thank you, Ricardo! I'm glad you found the guide detailed and easy to follow. Providing excellent resources for beginners is always our goal. If you have any specific questions or need further assistance, feel free to ask!
Carolina Vieira
This guide covers all the essentials a beginner should know about web scraping. I'm excited to delve into this topic. Well done, Jenny!
Jenny Jones
Thank you, Carolina! I'm glad you found the guide comprehensive and exciting. Delving into web scraping can be a rewarding journey. If you have any specific questions or need further assistance, feel free to ask!
Alejandro Castro
Jenny, your guide was well-organized and informative. It's great to have such a resource for beginners. Thank you!
Jenny Jones
You're welcome, Alejandro! I'm glad you found the guide well-organized and informative. Semalt aims to provide valuable resources for beginners in various domains. If you have any specific questions or need further assistance, feel free to ask!
Daniela Sánchez
I've been meaning to learn web scraping, and your guide was exactly what I needed. It will undoubtedly help me get started. Thank you, Jenny!
Jenny Jones
You're welcome, Daniela! I'm glad the guide was what you needed to kickstart your web scraping journey. If you have any specific questions or need further assistance, feel free to ask!
Felipe Gómez
Thank you, Jenny, for providing step-by-step instructions and practical tips in your guide. It's truly valuable for beginners like me!
Jenny Jones
You're welcome, Felipe! Step-by-step instructions and practical tips are essential for beginners. I'm glad you found them valuable. If you have any specific questions or need further assistance, feel free to ask!
Ana Sofia
Web scraping has always fascinated me, and your guide helped me take the first steps in this field. Well done, Jenny!
Jenny Jones
Thank you, Ana! Taking the first steps in web scraping is exciting. I'm glad the guide helped you embark on the journey. If you have any specific questions or need further assistance, feel free to ask!
Marcelo Costa
Your guide was clear, concise, and beginner-friendly. I appreciate the effort you put into creating it. Thank you, Jenny!
Jenny Jones
You're welcome, Marcelo! I'm glad you found the guide clear, concise, and beginner-friendly. Sharing valuable knowledge is always a pleasure. If you have any specific questions or need further assistance, feel free to ask!
Jimena González
This guide provided a solid foundation for me to start learning web scraping. The explanations were straightforward and easy to follow. Thank you, Jenny!
Jenny Jones
You're welcome, Jimena! A solid foundation is crucial for learning web scraping, and I'm glad the guide helped you with that. If you have any specific questions or need further assistance, feel free to ask!
Felipe Brito
Jenny, your guide was fantastic! As a beginner in web scraping, I appreciate the detailed explanations and examples. Thanks!
Jenny Jones
Thank you, Felipe! I'm glad you found the guide fantastic. Providing detailed explanations and relatable examples is crucial for beginners. If you have any specific questions or need further assistance, feel free to ask!
Sofia Velasco
I've always been curious about web scraping, and your guide provided the perfect introduction. Thank you, Jenny!
Jenny Jones
You're welcome, Sofia! Satiating curiosity is always an exciting journey. I'm glad the guide provided the perfect introduction to web scraping for you. If you have any specific questions or need further assistance, feel free to ask!
Gustavo Alves
Thank you, Jenny, for sharing your knowledge in such a well-structured guide. It's a valuable resource for beginners!
Jenny Jones
You're welcome, Gustavo! I'm glad you found the guide well-structured and valuable. Sharing knowledge is always a pleasure. If you have any specific questions or need further assistance, feel free to ask!
José Barbosa
Excellent guide, Jenny! The examples provided a practical understanding of web scraping. Thank you!
Jenny Jones
Thank you, José! Practical examples are key to understanding web scraping, and I'm glad they provided practical understanding. If you have any specific questions or need further assistance, feel free to ask!
Viviana Carvalho
I appreciate how you highlighted the potential challenges in web scraping. The guide is comprehensive and thoughtfully created. Thank you, Jenny!
Jenny Jones
You're welcome, Viviana! Highlighting potential challenges is important for successful web scraping. I'm glad you found the guide comprehensive and thoughtfully created. If you have any specific questions or need further assistance, feel free to ask!
Amanda Silva
Thank you for this valuable guide, Jenny! The explanations were clear, and the examples provided great insights. Well done!
Jenny Jones
You're welcome, Amanda! Clear explanations and insightful examples are essential for understanding web scraping. I'm glad you found them valuable. If you have any specific questions or need further assistance, feel free to ask!
Lorena Santos
Web scraping has always intrigued me, and your guide provided a comprehensive introduction. Thank you, Jenny!
Jenny Jones
You're welcome, Lorena! Web scraping is indeed intriguing, and I'm glad the guide provided a comprehensive introduction to satisfy your curiosity. If you have any specific questions or need further assistance, feel free to ask!
Mariano González
Jenny, excellent guide! The step-by-step approach and practical examples made it easy to understand. Thank you for sharing your knowledge!
Jenny Jones
Thank you, Mariano! A step-by-step approach and practical examples are crucial for easy understanding. Sharing knowledge is always a pleasure. If you have any specific questions or need further assistance, feel free to ask!
Luciana Santos
I found your guide very informative and beginner-friendly. It's an excellent resource for anyone interested in web scraping. Thank you, Jenny!
Jenny Jones
You're welcome, Luciana! I'm glad you found the guide informative and beginner-friendly. Semalt aims to provide excellent resources for anyone interested in web scraping. If you have any specific questions or need further assistance, feel free to ask!
Marcos Lima
Web scraping has always fascinated me, and your guide was a breath of fresh air. Thank you for sharing your expertise, Jenny!
Jenny Jones
Thank you, Marcos! Web scraping is indeed fascinating, and I'm glad the guide resonated with your curiosity. If you have any specific questions or need further assistance, feel free to ask!
Tiago Castro
Your guide was well-explained and structured. It's a valuable resource for beginners interested in web scraping. Thank you, Jenny!
Jenny Jones
You're welcome, Tiago! A well-explained and structured guide is crucial for beginners. I'm glad you found it valuable. If you have any specific questions or need further assistance, feel free to ask!
Débora Nunes
Jenny, your guide provided the clarity I needed to understand web scraping better. Thank you for sharing your knowledge!
Jenny Jones
You're welcome, Débora! I'm glad the guide provided the clarity you needed. Sharing knowledge and helping others understand is always rewarding. If you have any specific questions or need further assistance, feel free to ask!
Fabio Oliveira
As a beginner, your guide was exactly what I needed to get started with web scraping. The explanations were excellent. Thank you, Jenny!
Jenny Jones
You're welcome, Fabio! I'm glad the guide provided you with a great starting point for web scraping. Excellent explanations are crucial for beginners. If you have any specific questions or need further assistance, feel free to ask!
Natália Pereira
Web scraping can be challenging for beginners, but your guide broke it down effectively. Thank you for sharing, Jenny!
Jenny Jones
You're welcome, Natália! Breaking down challenges is crucial for beginners. I'm glad you found the guide effective. If you have any specific questions or need further assistance, feel free to ask!
Lucas Santos
Your guide was an excellent starting point for me in learning web scraping. I appreciate the effort you put into creating it. Thank you, Jenny!
Jenny Jones
Thank you, Lucas! Providing an excellent starting point is crucial for beginners. I'm glad you appreciated the effort. If you have any specific questions or need further assistance, feel free to ask!
Mariana Costa
Jenny, thank you for providing a beginner-friendly guide. It helped me gain a better understanding of web scraping. Well done!

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