Web programming using python frameworks.
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Web programming using python frameworks.
Web programming using python frameworks.
- 2. Learning Objectives By the end of this lesson, you will be able to: Demonstrate Web Scraping Demonstrate Web Frameworks Explain Django
- 3. Web Scraping
- 4. Web Scraping Web Scraping is a process of extracting information from a website or internet. Web scraping is one of the most important techniques of data extraction from internet. It allows the extraction of unstructured data from websites and convert it into structured data. BASIC STEPS FOR WEB SCRAPING Select website Authenticate Generate request Process Information
- 5. Web Scraping Applications Web Scraping plays a major role in data extraction that helps in business Improvements. At present, a website to any business is mandatory. This explains the importance of web scraping in information extraction Let’s see some of the applications of web scraping. Data Scienc e E- Commerce Sales Finance Web Scrapping Applications Marketing
- 6. Different Methods of Web Scraping There are different methods to extract information from websites. Authentication is an important aspect for web scraping and every website has some restrictions for their content extraction. Web scraping focuses on extracting data such as product costs, weather data, pollution check, criminal data, stock price movements etc,. in our local database for analysis. Copying API Keys Socket Programming
- 7. Web Scraping in Python Python is one of the favorite languages for web scraping. Web scraping can be used for data analysis when we have to analyze information from a website The important libraries in Python that assists us in web scraping are: Allows to scrape information from website in simple steps. Beautiful Soup Web scraping and automation tool Mechanize
- 8. Beautiful Soup Installation Steps Execute conda install –c anaconda beautifulsoup4 in anaconda prompt or Execute pip install beautifulsoup4 in command prompt Installation starts here
- 9. Demo: Web Scraping Using Beautiful Soup
- 10. Demo: Web Scraping Using Beautiful Soup
- 11. Demo: Web Scraping Using Beautiful Soup
- 12. Demo: Web Scraping Using Beautiful Soup
- 13. Do it yourself: Web Scraping Using Beautiful Soup pip install beautifulsoup4 from urllib.request import urlopen from bs4 import BeautifulSoup url="https://timesofindia.com" html=urlopen(url) s=BeautifulSoup(html, 'lxml') type(s) title=s.title title text=s.get_text() s.text s.find_all('a') links=s.find_all('a') for link in links: print(link.get("href"))
- 14. Django Framework
- 15. Django Django is a high-level, popular Python framework for web development. Access to Django is free & open source. Django is open-source and web apps can be created with less code. As a framework, it is used for backend and front-end web development. Fast Secure Scalable
- 17. Important Attributes of Django • A web browser is an interface for URL. • A URL is the web address and the act of assigning functions to url is called mapping. • Django template is simply a text document or a Python string marked- up using the Django template language. All the html files are stored in templates. • Static folder is used to store other CSS files, java files , images etc. • Functions related to web apps are written inside view. It also renders content to templates, puts information into model and gets information from databases.
- 18. Important Attributes of Django • Form fetches data from HTML form and helps connect to the model. • Model is information about the object structure stored in a database. It contains essential fields and data behavior. Information can be directly edited in the database. • Django automatically looks for an admin module in each application and imports it. Registration of object in model is done through admin, which is the mandatory first step for database management. • Database is the collection of data at backend.
- 19. Technical Architecture This is the technical architecture followed in Django:
- 20. Django Installation Steps Write conda install -c anaconda django in anaconda prompt.
- 21. Knowledge Check
- 22. Which of the following is a web scraping library in Python? a. Beautiful Soup b. Pandas c. Numpy d. None of the above Knowledge Check 1
- 23. Which of the following is a web scraping library in Python? a. Beautiful Soup b. Pandas c. Numpy d. None of the above Knowledge Check 1 The correct answer is a Beautiful Soup is for web scraping, Pandas for data analysis, and Numpy for numerical analysis.
- 24. Knowledge Check 2 Data extraction is the most important aspect of web scraping. a. False b. True
- 25. Knowledge Check 2 Data extraction is the most important aspect of web scraping. The correct answer is b Web scraping means extracting information from a URL. So, data extraction is the most important aspect of web scraping. a. False b. True
- 26. In Python, a=BeautifulSoup() is an expression, where a/an is a. A constructor b. An object c. A class d. A value returning function Knowledge Check 3
- 27. In Python, a=BeautifulSoup() is an expression, where a/an is a. A constructor b. An object c. A class d. A value returning function Knowledge Check 3 The correct answer is b a is an object created using BeautifulSoup().
- 28. What is the role of render_to_response method in Django? a. Generating web response b. Rendering data from web c. Rendering an HTML response d. None of above Knowledge Check 4
- 29. What is the role of render_to_response method in Django? a. Generating web response b. Rendering data from web c. Rendering an HTML response d. None of above Knowledge Check 4 The correct answer is c In Django, render_to_response method is used to easily render an HTML response.
- 30. Key Takeaways Web scraping is a method of extracting information from a URL. Beautiful Soup is one of the simplest and most useful web scraping libraries in Python. Django is a high-level web framework used for web development in Python.