Aero Wrote:This guide took me way longer than I anticipated so I will probably be adding more info later on. All feedback is welcome and appreciated, I am also willing to help anyone with questions they have regarding this post or bs4 / requests in general. I still don't really like the format of this post but I can't really think of a better way lol. Definitely my most HQ post I've ever made on HF, although that's not really saying much... Hope I can help a few people learn this amazing combination for webscraping in python!

Quote:Beautiful Soup is a Python library for pulling data out of HTML and XML files. It works with your favorite parser to provide idiomatic ways of navigating, searching and modifying the parse tree. It commonly saves programmers hours or days of work.

• Requests
  
  Code

  pip install requests


• Bs4
  
  Code

  pip install bs4


• Bs4 and requests both require python 3 (3.6 recommended)
  

• Finding all links on a page using soup.find_all()
  
  Code

  Example HTML: <a href="example.com">Somelink</a>, <a href="otherlink.net">Otherlink</a>

  ---

  
  
  Code

  links = [link.get("href") for link in soup.find_all("a")]
print(links)

  ---

  
  
  Code

  Result: "example.com","otherlink.net",etc.
  
  


• Finding text in first <p> tag using soup.find()
  
  Code

  Example HTML: <p>This is not the text you are looking for!</p>

  ---

  
  
  Code

  paragraph = soup.find("p").text
print(paragraph)

  ---

  
  
  Code

  Result: "This is not the text you are looking for!"

• Finding by class
  
  Code

  Example HTML: <p class="comment">Text to scrape</p>

  ---

  
  
  Code

  print(soup.select(".comment")) #make sure you are finding the right information
comments = [comment.text for comment in soup.select(".comment")] #Get text for all comments on page
print(comments)

  ---

  
  
  Code

  Result: "Text to scrape","other comment","more comments","etc"
  
  


• Finding by tags
  
  Code

  Example HTML: <p><span>Random text to find</span></p>

  ---

  
  
  Code

  print(soup.select("p > span"))
blocks = [block.text for block in soup.select("p > span")]
print(blocks)

  ---

  
  
  Code

  Result: "Random text to find", "another block of text"
  
  


• Finding by id
  
  Code

  Example HTML: <p><span id="comments">Comments, yay!</span></p>

  ---

  
  
  Code

  soup.select("#comments") OR soup.select("p > #comments")
comment_list = [comment.text for comment in soup.select("#comments")]
print(comment_list)

  ---

  
  
  Code

  Result: "comments, yay!", "comments are dumb", "more comments"
  
  

• Latest Version of Python
  


• BeautifulSoup4 Documentation
  


• Requests Documentation
  


• Lengthy Guide on Web Scraping
  


• Nachzehrer's Guide on Requests
  

(Apr 6, 2019 04:52 PM)Quevoy43 Wrote:  This helped me tremendously, thank you!

(Mar 28, 2019 06:22 PM)Aero Blue Wrote:  Introduction


What is Bs4?



Modules Used:

• Requests
  pip install requests


• Bs4
  pip install bs4


• Bs4 and requests both require python 3 (3.6 recommended)
  

Step 1: Getting the page

Code

url = "https://example.com/"
r = requests.get(url)
page = r.text
soup = Beautifulsoup(page, "html.parser")
print(soup.prettify())

---

Code

Result: "<html>...</html>"

If you need more help on using requests, please see Nachzehrer's Awesome Guide


Step 2: Parsing the page

Method 1: Find using soup.find() or soup.find_all()

• Finding all links on a page using soup.find_all()
  Example HTML: <a href="example.com">Somelink</a>, <a href="otherlink.net">Otherlink</a>links = [link.get("href") for link in soup.find_all("a")]print(links)Result: "example.com","otherlink.net",etc.


• Finding text in first <p> tag using soup.find()
  Example HTML: <p>This is not the text you are looking for!</p>paragraph = soup.find("p").textprint(paragraph)Result: "This is not the text you are looking for!"

Method 2: Find using soup.select()

• Finding by class
  Example HTML: <p class="comment">Text to scrape</p>print(soup.select(".comment")) #make sure you are finding the right informationcomments = [comment.text for comment in soup.select(".comment")] #Get text for all comments on pageprint(comments)Result: "Text to scrape","other comment","more comments","etc"


• Finding by tags
  Example HTML: <p><span>Random text to find</span></p>print(soup.select("p > span"))blocks = [block.text for block in soup.select("p > span")]print(blocks)Result: "Random text to find", "another block of text"


• Finding by id
  Example HTML: <p><span id="comments">Comments, yay!</span></p>soup.select("#comments") OR soup.select("p > #comments")comment_list = [comment.text for comment in soup.select("#comments")]print(comment_list)Result: "comments, yay!", "comments are dumb", "more comments"

Useful Links

• Latest Version of Python
  


• BeautifulSoup4 Documentation
  


• Requests Documentation
  


• Lengthy Guide on Web Scraping
  


• Nachzehrer's Guide on Requests