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Web development

Un tutorial de screen scraping proporcionado por Semalt

by
Jan 23, 2018

Cuando se trata de raspar contenido web, es común buscar en internet un pantalla de desecho ing tutorial. Hay ocasiones en que solo se puede acceder a la información que desea a través de una API (Lenguaje de programación de aplicaciones) y, en algunos casos, es posible que desee utilizar una herramienta de raspado de pantalla o optar por una biblioteca de Python para realizar sus tareas.

En este tutorial de raspado de pantallas, discutiremos las mejores y más famosas bibliotecas de Python y aprenderemos sobre los diferentes componentes de una página web.

Los componentes de una página web:

Cuando visita una página web, su navegador enviará una solicitud al servidor web. Esta solicitud se conoce como solicitud GET y el servidor enviará los archivos que le indicarán a su navegador web cómo presentar las páginas por usted. Hay cuatro componentes principales de una página web: HTML, CSS, JS e Imágenes. HTML contiene el contenido principal de una página y CSS se usa para agregar estilos a una página y la hace atractiva, encantadora y atractiva. Por otro lado, los archivos JavaScript o JS se utilizan para agregar interactividad a una página web, y las imágenes se utilizan para hacer que un sitio se vea profesional y mejor que los demás. Los mejores formatos de imagen son PNG y JPG; ambos formatos son adecuados para webmasters y curadores de imágenes y les permiten dar un aspecto interactivo a sus documentos web.

Diferentes bibliotecas de Python para raspar pantallas:

1. Solicitudes

Es la biblioteca más famosa y una de las mejores de Python. Las solicitudes están escritas por Kenneth Reitz y se usan para construir diferentes aplicaciones web y raspadores de datos.

2. Scrapy

Scrapy es hasta ahora la biblioteca de Python más poderosa y útil para sus tareas de análisis de pantalla. No necesita tener los conocimientos técnicos para utilizar esta biblioteca porque Scrapy automatiza las tareas de raspado web y ahorra tiempo y energía en cierta medida.

3. wxPython

Es un juego de herramientas GUI para Python y es una buena alternativa a Scrapy. Sin embargo, esta biblioteca Python no es tan común como Scrapy y BeautifulSoup.

4. Pandas

Pandas es principalmente un paquete de Python que está diseñado para trabajar con muestras de datos "relacionales" y "etiquetados". Pandas es una forma perfecta de eliminar contenido de Internet y es conocida por su maravillosa visualización y agregación de manipulación de datos.

5. Matplotlib

En este tutorial de raspado de pantalla, también aprenderá sobre Matplotlib, que es un paquete básico de SciPy Stack y una popular biblioteca de Python. Matplotlib está diseñado para las tareas de raspado de pantalla y genera visualizaciones potentes con facilidad. Es una buena alternativa a Scrapy y puede usarse individualmente o en combinación con NumPy, Pandas y SciPy. Sin embargo, Matplotlib es una biblioteca de bajo nivel, lo que significa que tendrá que escribir códigos sofisticados para alcanzar un nivel avanzado de extracción y visualización de datos.

6. BeautifulSoup

Al igual que Solicitudes y Scrapy, BeautifulSoup es una popular biblioteca de Python que se utiliza para analizar documentos HTML y XML (incluidas las etiquetas no cerradas). Ayuda a crear un árbol de análisis sintáctico para las páginas analizadas que se pueden usar para raspar datos de HTML.

Todas estas bibliotecas de Python se utilizan para tareas de exploración de pantalla y extraen datos útiles de los componentes de una página web mencionados anteriormente.

Max Bell
Thank you all for taking the time to read my tutorial on screen scraping! I hope you found it informative and useful.
Julia
I really enjoyed reading your tutorial, Max. Screen scraping is a powerful technique, and your explanations were clear and concise.
Max Bell
Thank you, Julia! I'm glad you found the explanations helpful. Do you have any specific questions or anything you would like to add?
Andrew
Max, I loved how you explained the step-by-step process of screen scraping in your tutorial. It helped me understand the various aspects involved.
Max Bell
Thank you, Andrew! I believe breaking down the process into clear steps makes it easier for beginners to grasp the concept. If you have any questions or need further clarification, feel free to ask.
Emma
I'm new to screen scraping, and your tutorial was really helpful, Max. It gave me a good starting point to explore this technique further.
Max Bell
Hi Emma! I'm glad to hear that the tutorial was useful to you. Screen scraping can open up many possibilities, and I encourage you to continue exploring it. Let me know if you have any specific questions.
Sophia
Fantastic tutorial, Max! I appreciate how you provided examples and code snippets to support the explanations. It made understanding the process much easier.
Max Bell
Thank you for your kind words, Sophia! I believe practical examples help reinforce the concepts. If you have any questions or need assistance with anything, feel free to ask.
Michael
Max, your tutorial was spot on! Screen scraping is a valuable skill, especially when dealing with unstructured data. Thank you for sharing your expertise.
Max Bell
You're welcome, Michael! I'm glad you found value in the tutorial. Screen scraping can indeed be very useful in handling unstructured data. If you have any further questions or need guidance, feel free to reach out.
Oliver
Max, great tutorial! However, I'm concerned about the legal implications of screen scraping. Are there any legal risks to consider while using this technique?
Max Bell
Hi Oliver! That's a valid concern. While screen scraping can be a powerful tool, it's important to ensure that you are scraping data ethically and within legal boundaries. Be mindful of the website's terms of service, respect robots.txt files, and avoid scraping sensitive or copyrighted information without proper authorization. It's always a good practice to consult with legal professionals if you have any doubts about the legality of your scraping activities.
Natalie
Max, I loved your tutorial on screen scraping. It was comprehensive and easy to follow. Thank you for sharing your knowledge!
Max Bell
Thank you, Natalie! I appreciate your kind words. If you have any questions or need further assistance in implementing screen scraping techniques, feel free to ask.
Ethan
Great tutorial, Max! I found your explanations on handling dynamic content during screen scraping particularly helpful. It can be quite challenging, but your examples made it clear.
Max Bell
Thank you, Ethan! Handling dynamic content is indeed a challenge in screen scraping, but there are techniques like using headless browsers or making API calls to retrieve updated data. If you have any specific scenarios or questions regarding dynamic content, feel free to ask.
Isabella
Max, your tutorial was excellent! I appreciate the emphasis on data cleansing and validation. That's often an overlooked aspect, but crucial for accurate results.
Max Bell
Thank you, Isabella! Data cleansing and validation are indeed critical steps to ensure the accuracy of scraped data. If you have any questions related to data cleansing techniques or specific challenges you've faced, I'll be happy to help.
Adam
Max, as someone relatively new to coding, your tutorial was very beginner-friendly. Thank you for breaking down the complex concepts and making them accessible!
Max Bell
You're welcome, Adam! I'm glad you found the tutorial beginner-friendly. Making complex concepts accessible is one of my goals, as I believe anyone can learn to code with the right approach. If you have any specific questions or need further guidance on your coding journey, feel free to ask.
Liam
Max, your tutorial was awesome! Screen scraping is such a valuable skill for automating data collection tasks. I can't wait to apply what I've learned.
Max Bell
Thank you, Liam! I'm thrilled that you found the tutorial valuable. Automation is a key benefit of screen scraping, and I'm sure you'll find numerous applications for it. If you encounter any challenges while applying the techniques, don't hesitate to ask for assistance.
Grace
Max, your tutorial on screen scraping was fantastic! It gave me the confidence to start exploring this powerful technique and use it for my projects. Thank you!
Max Bell
Thank you, Grace! I'm delighted to hear that the tutorial inspired you to explore screen scraping further. It's a powerful tool that can enhance your projects. If you have any questions or need guidance along the way, feel free to reach out.
Lucas
Max, great tutorial! I particularly appreciated the information you provided on handling AJAX requests and ensuring reliable scraping. It was very helpful.
Max Bell
Thank you, Lucas! AJAX requests can present challenges in screen scraping, but understanding how to handle them is important. If you have any specific scenarios where AJAX requests are causing issues, feel free to describe them, and I'll be glad to provide assistance.
Madison
Max, your tutorial was incredibly informative! I've always wanted to learn screen scraping, and your explanations and examples made it so much easier to grasp. Thanks!
Max Bell
You're welcome, Madison! I'm thrilled that my tutorial helped you understand screen scraping better. If you have any specific questions or need further guidance on any specific aspect of screen scraping, feel free to ask.
Sophie
Max, your tutorial on screen scraping was brilliant! I've been wanting to dive into this field, and your tutorial provided a great foundation. Thank you!
Max Bell
Thank you, Sophie! I'm glad you found the tutorial brilliant and that it provided a strong foundation for your journey into screen scraping. If you have any questions as you dive deeper into the field, feel free to ask.
Aaron
Max, your tutorial was amazing! I'm excited to try screen scraping on my own and apply it to various projects. Thanks for sharing your knowledge!
Max Bell
You're welcome, Aaron! I'm excited to hear that you're inspired to try screen scraping on your projects. It can add a lot of value and automate many tedious tasks. If you need any assistance or have questions while implementing the techniques, feel free to ask.
Mia
Max, your tutorial was outstanding! I appreciate how you also covered handling login/authentication during screen scraping. Very helpful!
Max Bell
Thank you, Mia! Handling login/authentication is a common requirement in screen scraping, and I'm glad you found the coverage helpful. If you encounter any challenges or have questions related to login/authentication, feel free to ask.
Daniel
Max, your tutorial was superb! It was well-structured and covered all the necessary aspects of screen scraping. Thank you for your efforts!
Max Bell
Thank you, Daniel! I'm glad you found the tutorial superb and that it covered all the necessary aspects. If you have any particular areas you'd like to explore further or questions related to screen scraping, feel free to ask.
Emily
Max, your tutorial on screen scraping was excellent! I appreciate the inclusion of best practices to ensure efficient and reliable scraping.
Max Bell
Thank you, Emily! Inclusion of best practices is crucial while screen scraping to ensure efficiency and reliability. If you have any specific questions or need to dive deeper into any particular best practice, feel free to ask.
Noah
Max, your tutorial was comprehensive! It covered a wide range of topics related to screen scraping, and your explanations were easy to follow. Thank you!
Max Bell
You're welcome, Noah! I'm thrilled that you found the tutorial comprehensive and the explanations easy to follow. If you have any questions related to specific topics or need further clarification, don't hesitate to ask.
Ava
Max, your tutorial on screen scraping was outstanding! I particularly enjoyed the practical examples and real-life use cases. Thank you!
Max Bell
Thank you, Ava! I'm glad you found the practical examples and real-life use cases enjoyable. Applying screen scraping in practical scenarios can help in understanding its potential. If you have any specific use cases you'd like to discuss or questions on implementation, feel free to ask.
Henry
Max, your tutorial was amazing! It gave me a solid foundation in screen scraping and provided me with the knowledge to explore further. Thank you!
Max Bell
You're welcome, Henry! I'm thrilled to hear that my tutorial gave you a solid foundation and inspired further exploration. If you have any questions as you delve deeper into screen scraping or need assistance, feel free to ask.
Emily
Max, your expertise in screen scraping shines through in your tutorial. It was informative and well-explained. Thank you!
Max Bell
Thank you, Emily! I'm glad you found the tutorial informative and well-explained. If you have any questions or need any specific guidance while applying screen scraping techniques, feel free to ask.
James
Max, your tutorial on screen scraping was fantastic! The explanations were clear, and the examples helped clarify the concepts. Thank you for sharing your knowledge.
Max Bell
Thank you, James! I'm delighted to hear that you found the tutorial fantastic and that the explanations were clear. If you have any specific questions related to the concepts covered or need assistance in implementing screen scraping, feel free to ask.
Lily
Max, your tutorial was excellent! As someone new to screen scraping, it provided me with a great starting point to dive into this field. Thank you!
Max Bell
You're welcome, Lily! I'm thrilled that my tutorial provided a great starting point for your journey into screen scraping. If you have any questions while exploring the field or need assistance, feel free to ask.
Owen
Max, your tutorial was fantastic! The step-by-step approach made it easy for me to follow and understand the screen scraping process. Thank you!
Max Bell
Thank you, Owen! I'm glad the step-by-step approach helped you follow and understand the screen scraping process. If you have any questions related to any of the steps or need further clarification, feel free to ask.
Zoe
Max, your tutorial on screen scraping was excellent! I appreciated the emphasis on handling different types of data formats during scraping.
Max Bell
Thank you, Zoe! Handling different types of data formats is an important aspect of screen scraping, and I'm glad you appreciated the emphasis on it. If you have any specific scenarios or questions related to data format handling, feel free to share them, and I'll be happy to assist.
Gabriel
Max, your tutorial was brilliant! I'm excited to apply screen scraping techniques to automate repetitive tasks. Thank you for sharing your expertise.
Max Bell
Thank you, Gabriel! I'm thrilled to hear that you found the tutorial brilliant and that you're excited to apply screen scraping techniques to automate tasks. Automation can save a lot of time and effort. If you need any guidance or have specific tasks you'd like to automate, feel free to ask.
Brooklyn
Max, your tutorial on screen scraping was outstanding! It was comprehensive and covered a wide range of topics. Thank you for sharing your knowledge.
Max Bell
Thank you, Brooklyn! I'm glad you found the tutorial outstanding and comprehensive. If you have any specific questions related to the topics covered or need assistance in any aspect of screen scraping, feel free to ask.
David
Max, your tutorial was amazing! The explanations were clear, and the practical examples helped solidify my understanding. Thank you!
Max Bell
You're welcome, David! I'm delighted to hear that my tutorial provided clear explanations and helped solidify your understanding. If you have any questions related to any aspect of screen scraping or need further clarification, feel free to ask.
Victoria
Max, your tutorial on screen scraping was superb! It gave me the confidence to explore this field and apply it to my projects. Thank you!
Max Bell
Thank you, Victoria! I'm thrilled to hear that my tutorial gave you confidence in exploring screen scraping and applying it to your projects. If you have any questions while exploring or need assistance, feel free to ask.
Benjamin
Max, your expertise in screen scraping is evident in your tutorial. It provided valuable insights and practical knowledge. Thank you!
Max Bell
Thank you, Benjamin! I'm glad you found valuable insights and practical knowledge in my tutorial. If you have any specific questions or need assistance related to screen scraping, feel free to ask.
Hannah
Max, your tutorial on screen scraping was excellent! It covered all the important aspects, and the explanations were easy to follow. Thank you!
Max Bell
Thank you, Hannah! I'm delighted to hear that my tutorial covered all the important aspects and that the explanations were easy to follow. If you have any specific questions related to any aspect or need assistance, don't hesitate to ask.
Leo
Max, your tutorial was fantastic! It helped me understand the fundamentals of screen scraping and provided useful tips. Thank you for sharing!
Max Bell
You're welcome, Leo! I'm thrilled that my tutorial helped you understand the fundamentals of screen scraping and provided useful tips. If you have any questions or need further guidance, feel free to ask.
Brooke
Max, your tutorial on screen scraping was outstanding! It was well-structured, and the explanations were thorough. Thank you for sharing your knowledge!
Max Bell
Thank you, Brooke! I'm glad you found my tutorial outstanding, well-structured, and thorough. If you have any specific questions or need assistance related to screen scraping, feel free to ask.
Christopher
Max, your expertise in screen scraping is apparent in your tutorial. It was well-explained and provided a great introduction to the topic. Thank you!
Max Bell
Thank you, Christopher! I appreciate your kind words about my expertise in screen scraping. If you have any questions or need assistance as you delve deeper into the topic, feel free to ask.
Stella
Max, your tutorial on screen scraping was excellent! The examples helped in understanding the concepts better. Thank you!
Max Bell
Thank you, Stella! I'm glad the examples included in my tutorial helped in understanding the concepts better. If you have any specific examples or scenarios you'd like to discuss or need assistance applying the concepts, feel free to ask.
Jack
Max, your tutorial was amazing! It was beginner-friendly and covered all the necessary steps for successful screen scraping. Thank you!
Max Bell
Thank you, Jack! I'm thrilled that you found the tutorial amazing and beginner-friendly. Covering all the necessary steps is crucial for successful screen scraping. If you have any specific questions or need further guidance, feel free to ask.
Sarah
Max, your tutorial on screen scraping was fantastic! It helped me understand the process and potential applications better. Thank you!
Max Bell
You're welcome, Sarah! I'm delighted to hear that my tutorial helped you understand the screen scraping process and its potential applications better. If you have any specific questions or need guidance on any specific applications, let me know.
Isaac
Max, your tutorial was excellent! As a newcomer to screen scraping, I found it very informative and easy to follow. Thank you!
Max Bell
Thank you, Isaac! I'm glad you found my tutorial excellent and that it was informative and easy to follow for a newcomer to screen scraping. If you have any questions or need assistance while exploring the field, feel free to ask.
Zara
Max, your expertise in screen scraping shines in your tutorial. It was comprehensive and provided valuable insights. Thank you!
Max Bell
Thank you, Zara! I'm delighted to hear that my expertise in screen scraping shines through in my tutorial and that it provided valuable insights. If you have any specific questions or need assistance, feel free to ask.
Jaxon
Max, your tutorial on screen scraping was outstanding! It covered all the necessary information, and the examples were great. Thank you for sharing!
Max Bell
Thank you, Jaxon! I'm glad you found my tutorial outstanding and that it covered all the necessary information. If you have any specific questions related to any aspect or need assistance, don't hesitate to ask.
Clara
Max, your tutorial was amazing! The explanations were clear, and the examples helped solidify my understanding. Thank you for sharing your knowledge.
Max Bell
You're welcome, Clara! I'm thrilled that my tutorial provided clear explanations and helped solidify your understanding. If you have any questions related to any topic covered or need further clarification, feel free to ask.
Julian
Max, your tutorial on screen scraping was excellent! It was an insightful introduction to the topic, and the examples were helpful. Thank you!
Max Bell
Thank you, Julian! I'm glad you found my tutorial excellent and that it provided an insightful introduction to screen scraping. If you have any specific examples or questions related to the topic, don't hesitate to ask.
Amelia
Max, your tutorial was fantastic! It covered the essentials of screen scraping and provided practical tips. Thank you!
Max Bell
Thank you, Amelia! I'm glad you found my tutorial fantastic and that it covered the essentials of screen scraping. If you have any specific questions or need further guidance, feel free to ask.
Oscar
Max, your tutorial on screen scraping was excellent! The step-by-step approach was helpful in understanding the process. Thank you!
Max Bell
Thank you, Oscar! I'm thrilled that you found my tutorial excellent and that the step-by-step approach helped in understanding the screen scraping process. If you have any specific questions or need further clarification, feel free to ask.
Victoria
Max, your tutorial was amazing! It provided a great overview of screen scraping and practical tips. Thank you for sharing your knowledge.
Max Bell
You're welcome, Victoria! I'm delighted to hear that my tutorial provided a great overview of screen scraping and practical tips. If you have any questions or need assistance while applying the techniques, feel free to ask.
Joseph
Max, your expertise in screen scraping is evident in your tutorial. It was comprehensive and provided valuable insights. Thank you!
Max Bell
Thank you, Joseph! I appreciate your kind words about my expertise and that you found my tutorial comprehensive and valuable. If you have any specific questions or need further assistance, feel free to ask.
Charlotte
Max, your tutorial was outstanding! The explanations were clear, and the examples made it easy to grasp the concepts. Thank you!
Max Bell
Thank you, Charlotte! I'm glad you found my tutorial outstanding and that the explanations were clear. If you have any questions or need further assistance in grasping any concepts, feel free to ask.
Henry
Max, your tutorial on screen scraping was excellent! It gave me a solid foundation to start exploring this technique further. Thank you!
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