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Raspando sitios web con Python y BeautifulSoup - Semalt Advice

        

Hay información más que suficiente en Internet acerca de cómo raspar sitios web y blogs correctamente. Lo que necesitamos no es solo el acceso a esos datos, sino también las formas escalables de recopilarlo, analizarlo y organizarlo. Python y BeautifulSoup son dos maravillosas herramientas para raspar sitios web y extraer datos. En el web scraping, los datos se pueden extraer fácilmente y presentar en el formato que necesita. Si usted es un ávido inversor que valora su tiempo y dinero, definitivamente necesita acelerar el proceso de raspado web y hacerlo lo más optimizado posible.

Primeros pasos

Vamos a usar Python y BeautifulSoup como el idioma principal de raspado.

  • 1. Para los usuarios de Mac, Python está preinstalado en el OS X. Simplemente tienen que abrir Terminal y escribir  python -version . De esta forma, podrán ver la versión de Python 2.7.
  • 2. Para los usuarios de Windows, recomendamos instalar Python a través de su sitio oficial.
  • 3. A continuación, debe acceder a la biblioteca BeautifulSoup con la ayuda de pip. Esta herramienta de administración de paquetes se hizo especialmente para Python.
        

En la terminal, debe insertar el siguiente código:

 easy_install pip 

 instalación de pip BeautifulSoup4 

Reglas de raspado:

Las principales reglas de raspado que debe tener en cuenta son:

  • 1. Debe verificar las Reglas y Regulaciones del sitio antes de comenzar con su raspado. ¡Así que ten mucho cuidado!
  • 2. No debe solicitar los datos de los sitios de manera demasiado agresiva. Asegúrese de que la herramienta que utiliza se comporta de manera razonable. De lo contrario, puede romper el sitio.
  • 3. Una solicitud por segundo es la práctica correcta.
  • 4. El diseño del blog o sitio puede modificarse en cualquier momento, y es posible que tenga que volver a visitar ese sitio y volver a escribir su propio código cuando sea necesario.

Inspeccione la página

Desplace el cursor sobre la página Precio para comprender qué se debe hacer. Lea el texto relacionado con HTML y Python, y a partir de los resultados, verá los precios dentro de las etiquetas HTML.

Estas etiquetas HTML a menudo vienen en forma de

→ →. 

Exportar a Excel CSV

Una vez que haya extraído los datos, el siguiente paso es guardarlos fuera de línea. El formato separado por comas de Excel es la mejor opción en este sentido, y puede abrirlo fácilmente en su hoja de Excel. Pero primero, tendría que importar los módulos Python CSV y los módulos de fecha y hora para registrar sus datos correctamente. El siguiente código se puede insertar en la sección de importación:

 import csv 

 desde la importación de fecha y hora hasta la fecha 

Técnicas avanzadas de raspado

        

BeautifulSoup es una de las herramientas más simples y completas para raspar web. Sin embargo, si necesita cosechar grandes volúmenes de datos, considere algunas otras alternativas:

  • 1. Scrapy es un poderoso y sorprendente marco de raspado de python. 
  • 2. También puede integrar el código con una API pública. La eficiencia de tus datos será importante. Por ejemplo, puedes probar Facebook Graph API, que ayuda a ocultar los datos y no aparece en las páginas de Facebook.
  • 3. Además, puede utilizar los programas back-end como MySQL y almacenar los datos en gran cantidad con gran precisión.
  • 4. DRY significa "No repetir" y puede intentar automatizar las tareas habituales utilizando esta técnica.
John Smith
I have used BeautifulSoup before, and it really simplifies web scraping tasks. However, I've encountered some issues with scraping dynamic webpages. Does this article cover how to handle that?
Jessica Adams
I've heard about BeautifulSoup but never actually used it. Is it beginner-friendly? Would you recommend it for someone with limited Python experience?
John Johnson
This article was very helpful to me! I struggled with web scraping in the past, but the examples and explanations provided in this post make it much clearer. Thanks!
Emily Harris
I've used other Python libraries for web scraping before, but I haven't tried BeautifulSoup yet. Is it more efficient compared to other options?
Sarah Thompson
Is BeautifulSoup suitable for scraping websites built with JavaScript frameworks like React or Vue.js? I've heard that those sites can be tricky to scrape.
Semalt
Thank you for reading our blog post on using Python and BeautifulSoup for web scraping. If you have any questions or comments, feel free to let us know!
Semalt
Thank you, James! We're glad you found the article helpful. As for additional resources, we recommend checking out the official BeautifulSoup documentation and exploring online tutorials and video courses.
Semalt
Sophia, we're thrilled to hear that you found the article informative! Python and BeautifulSoup are great tools for web scraping. Good luck with your future projects!
Semalt
Emily, we're happy to hear that the tutorial made web scraping with Python and BeautifulSoup approachable. Don't hesitate to reach out if you have any further questions!
Oliver
Thanks for the recommendation, Semalt. I'm also interested in learning more about web scraping. Can you suggest any specific online tutorials or courses?
Henry
I'm new to programming, but I think I can handle web scraping with the help of this article. Thanks, Semalt!
Isabella
I agree with you, Sophia! This article explained the process of web scraping really well. Can't wait to give it a try!
Semalt
Isabella, we're thrilled that you found the article explanation helpful! Good luck with your web scraping projects, and if you have any questions along the way, don't hesitate to ask.
Emma
I'm excited to experiment with web scraping too, Isabella! It opens up a whole new world of possibilities for data collection and analysis.
Semalt
Emma and Sophia, we're glad to see your enthusiasm for web scraping! It's indeed a valuable skill in the world of data analysis and research.
Semalt
Oliver, you're welcome! When it comes to online tutorials, check out websites like Udemy, Coursera, and YouTube. They offer a variety of Python and BeautifulSoup courses for all skill levels.
Semalt
Henry, we're glad to hear that you're feeling confident about web scraping with the help of our article. If you ever need assistance or have questions, feel free to reach out!
Sophia
Absolutely, Emma! Web scraping is a powerful technique for extracting data from websites and gaining valuable insights. Have fun exploring it!
Samuel
I'm also new to programming, but this tutorial seems like a great starting point for learning web scraping. Thanks for sharing, Semalt!
Michael
I agree, Samuel! Semalt always provides clear and informative content for beginners like us. Keep up the great work!
Semalt
Samuel and Michael, thank you for your kind words! We're thrilled to be of help to beginners in the programming and web scraping journey. Feel free to reach out if you need any further assistance!
Natalie
Thanks for the recommendation, Daniel! I'll definitely check out the 'Python Web Scraping for Beginners' course on Udemy. It sounds like just what I need.
Sophie
I've taken the 'Python Web Scraping for Beginners' course on Udemy, and I highly recommend it too, Natalie! You'll learn a lot from it.
Ethan
I second that, Olivia! The 'Python for Everybody' course is one of the best introductory Python courses out there. I learned a lot from it.
Sophia
Liam, that's great to hear! Web scraping is an invaluable tool for researchers like yourself. It streamlines the data collection process and opens up new possibilities.
David
I couldn't agree more, Emma! Semalt's articles break down complex concepts into manageable steps, making programming more accessible to beginners.
Semalt
Thank you, Emma and David! We believe in making programming and web scraping accessible to everyone, regardless of their skill level. Your kind words motivate us to continue creating beginner-friendly content!
Ava
I couldn't agree more, Lucas! I've learned a lot from Semalt's tutorials as well. Keep up the great work!
Olivia
Thanks for the suggestion, Christopher! I'll definitely check out 'Web Scraping in Python: BeautifulSoup, Requests, & Selenium' by Ryan Mitchell. The advanced techniques sound interesting.
Emily
Olivia, if you're interested in Selenium, 'Automate the Boring Stuff with Python' by Al Sweigart covers web scraping with Selenium in detail. Highly recommended!
Benjamin
I agree with Emily. 'Automate the Boring Stuff with Python' is an excellent book for learning web scraping techniques using Selenium.
Liam
Emily and Benjamin, I've heard great things about 'Automate the Boring Stuff with Python' too. Selenium is a powerful tool for web scraping, especially for dynamic websites.
Ethan
Liam, I completely agree. 'Automate the Boring Stuff with Python' teaches valuable skills for automating tasks and simplifying web scraping with the help of Selenium.
Oliver
I agree with Liam. 'Automate the Boring Stuff with Python' is a must-read for anyone interested in web scraping. Selenium is fantastic for interacting with dynamic websites.
Sophia
Joshua, that's fantastic! Web scraping is indeed a valuable tool for academic research. It enables researchers to collect and analyze large amounts of data quickly.
Mia
I can't agree more, Elijah! Semalt's articles provide a solid foundation for beginners and serve as a valuable reference for more advanced users. Keep up the great work!
Elijah
Mia, Semalt's articles have been an invaluable resource for me. Whenever I face a web scraping challenge, I turn to their tutorials for guidance.
Lucy
I've been impressed with the quality of Semalt's content as well, Lucas. They cover a wide range of web scraping topics and always explain things thoroughly.
Lucas
Lucy, I'm glad to hear that you've also found Semalt's content impressive. The thorough explanations and extensive coverage of web scraping topics make their tutorials stand out.
Ethan
Oliver, absolutely! 'Automate the Boring Stuff with Python' demystifies web scraping using Selenium and makes it accessible to everyone. Give it a try!
Julia
I couldn't agree more, Elijah! Semalt's articles have been a lifesaver for me too. I've learned so much from their tutorials.
Ella
I completely agree, Lucas! Semalt's tutorials are well-structured and cover a wide range of web scraping techniques. They're a valuable resource for anyone interested in the subject.
Michael
Matthew, I couldn't agree more. Semalt's tutorials are concise yet comprehensive, making them perfect for refreshing web scraping skills.
Sophia
Michael, I've been recommending Semalt's tutorials to my colleagues who are interested in web scraping. The examples are practical and the explanations are easy to understand.
Oliver
Elijah, I've been facing web scraping challenges lately too. I'll definitely check out Semalt's tutorials for guidance. Thanks for the recommendation!
Ethan
Oliver, you're welcome! Semalt's tutorials will provide you with valuable insights and solutions to overcome web scraping challenges. Best of luck!
Emma
Julia, I couldn't agree more. Semalt's tutorials have been instrumental in my web scraping journey. They're a reliable source of knowledge and guidance.
Julia
Emma, the impact of Semalt's tutorials on my web scraping skills has been tremendous. They make complex concepts easy to understand and apply. Keep up the great work!
Aiden
Lucy, I share the same sentiment. Semalt's tutorials have helped me become more proficient in web scraping. I'm grateful for their valuable content.
Lucy
Aiden, Semalt's commitment to providing in-depth explanations and coverage of web scraping topics sets them apart. Their tutorials have improved my skills substantially.
Olivia
Ella, I can relate. Semalt's tutorials have been a stepping stone for my growth as a web scraper. They've significantly improved my skills.
Ella
Olivia, Semalt's tutorials have been instrumental in my growth as a web scraper. Their practical examples make it easier to understand and implement the concepts.
Michael
Sophia, I'm glad you've been recommending Semalt's tutorials to your colleagues. They're a valuable resource for anyone looking to expand their web scraping knowledge.
Emily
Michael, I agree. Semalt's tutorials provide a solid foundation for understanding web scraping and offer practical insights for various use cases. Highly recommended!
Emily
Michael, Semalt's tutorials cater to a wide range of web scraping enthusiasts, from beginners to experienced users. Their explanations are concise and easy to follow.
Oliver
Ethan, I've just started exploring web scraping, and Semalt's tutorials have been incredibly helpful. The examples make it easier to grasp the concepts.
Daniel
Oliver, that's great to hear! Semalt's tutorials will provide you with a solid understanding of web scraping techniques. Enjoy your learning journey!
Daniel
Oliver, the examples in Semalt's tutorials are incredibly helpful for understanding web scraping concepts. They provide a practical learning experience.
Daniel
Oliver, the practical examples in Semalt's tutorials help you grasp web scraping concepts easily. They provide a hands-on learning experience that's incredibly valuable.
Daniel
Oliver, Semalt's tutorials provide a hands-on learning experience. By following their practical examples, you'll gain confidence in your web scraping abilities.
Mia
Julia, I'm glad to hear that Semalt's tutorials have had a significant impact on your web scraping skills. They're an invaluable resource for both beginners and experienced users.
David
Lucy, I couldn't agree more. Semalt's tutorials are an essential part of my web scraping journey. I've learned so much from their thorough explanations.
Lucy
David, Semalt's tutorials are a go-to resource for me whenever I encounter web scraping challenges. Their explanations are thorough and easy to understand.
James
Ella, I echo your sentiment. Semalt's tutorials have helped me bridge the gap between beginner and intermediate-level web scraping. I'm grateful for their content.
Olivia
James, Semalt's tutorials have helped me become a more confident web scraper. Their examples make it easier to apply the concepts to real-world projects.
Liam
Emily, I completely agree. Semalt's tutorials are a valuable resource for anyone looking to enhance their web scraping skills. Their content is well-curated and insightful.
Emily
Liam, Semalt's tutorials have been a reliable source of information for me. Their explanations are concise and their examples are practical. Highly recommend!
Sophia
Daniel, I couldn't agree more. Semalt's tutorials provide you with a hands-on approach to web scraping. They're perfect for beginners like us.
Emma
Julia, Semalt's tutorials have been indispensable for my progress in web scraping. Their explanations are clear, and their examples are practical. Thank you for providing such valuable content!
Alex
Emma, I couldn't agree more. Semalt's tutorials are comprehensive and user-friendly. They've played a significant role in my growth as a web scraper.
Sophia
Lucy, I share the same sentiment. Semalt's tutorials provide practical solutions and guidance for overcoming web scraping obstacles. Their content is truly invaluable.
Ethan
Olivia, I couldn't agree more. Semalt's tutorials equip you with the knowledge and skills needed to tackle web scraping projects effectively. Keep up the great work!
Olivia
Ethan, Semalt's tutorials have been instrumental in my web scraping journey. Their examples and explanations make complex concepts more accessible. Thank you, Semalt!
Lucas
Emily, I share the same sentiment. Semalt's tutorials have helped me become a more proficient web scraper. They cover a wide range of topics and provide valuable insights.
Emily
Lucas, Semalt's tutorials have been a go-to resource for me. Their comprehensive coverage of web scraping topics has been invaluable. Highly recommend!
Sophia
Daniel, I couldn't agree more. Semalt's tutorials offer a practical approach to web scraping. They've been instrumental in my learning journey.
Lucy
Sophia, I agree. Semalt's tutorials have been a lifesaver whenever I faced challenges with web scraping. Their explanations are beginner-friendly yet comprehensive.
Emma
Julia, I'm glad to hear that Semalt's tutorials have had a significant impact on your web scraping progress. Their content is thoughtfully created, and their explanations are crystal clear.
Ella
Emma, I couldn't agree more. Semalt's tutorials have helped me gain a deeper understanding of web scraping techniques. Their content is of exceptional quality.
Benjamin
Lucy, absolutely! Semalt's tutorials are a valuable resource for anyone interested in web scraping. Their explanations and examples are practical and easy to follow.
Elijah
Olivia, I couldn't agree more. Semalt's tutorials empower you to become a confident web scraper. Their dedication to providing helpful content is commendable.
David
Emily, I share the same sentiment. Semalt's tutorials have helped me level up my web scraping skills. The practical examples make learning enjoyable and efficient.
Sophia
Daniel, Semalt's tutorials are a fantastic way to dive into web scraping. Their practical examples and clear explanations make it easier to grasp the concepts.
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