Introduction

• Web Scraping With Python Pdf
• Web Scraping Python Beautifulsoup Github Pdf
• Web Scraping Python Beautifulsoup Github Pdf

Web scraping is a technique employed to extract a large amount of data from websites and format it for use in a variety of applications. Web scraping allows us to automatically extract data and present it in a usable configuration, or process and store the data elsewhere. The data collected can also be part of a pipeline where it is treated as an input for other programs.

In the past, extracting information from a website meant copying the text available on a web page manually. This method is highly inefficient and not scalable. These days, there are some nifty packages in Python that will help us automate the process! In this post, I’ll walk through some use cases for web scraping, highlight the most popular open source packages, and walk through an example project to scrape publicly available data on Github.

The incredible amount of data on the Internet is a rich resource for any field of research or personal interest. To effectively harvest that data, you’ll need to become skilled at web scraping.The Python libraries requests and Beautiful Soup are powerful tools for the job. If you like to learn with hands-on examples and you have a basic understanding of Python and HTML, then this tutorial is. 1 hour ago  I was trying to use BeautifulSoup to get the sector, industry and sub-industry from bloomberg link below enter link description here using the. Requests# Well known library for most of the Python developers as a fundamental tool to get raw. Aug 13, 2018 Make http requests in python via requests library. Use chrome dev tools to see where data is on a page. Scrape data from downloaded pages when data is not available in structured form using BeautifulSoup library. Parse data like tables into python 2D array. Scraping function to get data in form of a dictionary (key-val pairs). Jul 25, 2017 Advanced Web Scraping: Bypassing “403 Forbidden,” captchas, and more; Also, there are multiple libraries for web scraping. BeautifulSoup is one of those libraries. You go through our free course- Introduction to Web Scraping using Python to learn more. Learn, Engage, Compete & Get Hired You can also read this article on our Mobile APP.

Web Scraping Use Cases

Web scraping is a powerful data collection tool when used efficiently. Some examples of areas where web scraping is employed are:

• Search: Search engines use web scraping to index websites for them to appear in search results. The better the scraping techniques, the more accurate the results.
• Trends: In communication and media, web scraping can be used to track the latest trends and stories since there is not enough manpower to cover every new story or trend. With web scraping, you can achieve more in this field.
• Branding: Web scraping also allows communications and marketing teams scrape information about their brand’s online presence. By scraping for reviews about your brand, you can be aware of what people think or feel about your company and tailor outreach and engagement strategies around that information.
• Machine Learning: Web scraping is extremely useful in mining data for building and training machine learning models.
• Finance: It can be useful to scrape data that might affect movements in the stock market. While some online aggregators exist, building your own collection pool allows you to manage latency and ensure data is being correctly categorized or prioritized.

Tools & Libraries

There are several popular online libraries that provide programmers with the tools to quickly ramp up their own scraper. Some of my favorites include:

• Requests – a library to send HTTP requests, which is very popular and easier to use compared to the standard library’s urllib.
• BeautifulSoup – a parsing library that uses different parsers to extract data from HTML and XML documents. It has the ability to navigate a parsed document and extract what is required.
• Scrapy – a Python framework that was originally designed for web scraping but is increasingly employed to extract data using APIs or as a general purpose web crawler. It can also be used to handle output pipelines. With scrapy, you can create a project with multiple scrapers. It also has a shell mode where you can experiment on its capabilities.
• lxml – provides python bindings to a fast html and xml processing library called libxml. Can be used discretely to parse sites but requires more code to work correctly compared to BeautifulSoup. Used internally by the BeautifulSoup parser.
• Selenium – a browser automation framework. Useful when parsing data from dynamically changing web pages when the browser needs to be imitated.

Using the Beautifulsoup HTML Parser on Github

We’re going to use the BeautifulSoup library to build a simple web scraper for Github. I chose BeautifulSoup because it is a simple library for extracting data from HTML and XML files with a gentle learning curve and relatively little effort required. It provides handy functionality to traverse the DOM tree in an HTML file with helper functions.

Requirements

In this guide, I will expect that you have a Unix or Windows-based machine. You might want to install Kite for smart autocompletions and in-editor documentation while you code. You are also going to need to have the following installed on your machine:

• Python 3
• BeautifulSoup4 Library

Profiling the Webpage

We first need to decide what information we want to gather. In this case, I’m hoping to fetch a list of a user’s repositories along with their titles, descriptions, and primary programming language. To do this, we will scrape Github to get the details of a user’s repositories. While this information is available through Github’s API, scraping the data ourselves will give us more control over the format and thoroughness of the end data.

Once that’s done, we’ll profile the website to see where our target information is located and create a plan to retrieve it.

To profile the website, visit the webpage and inspect it to get the layout of the elements.

Let’s visit Guido van Rossum’s Github profile as an example and view his repositories:

1. The div containing the list of repos From the screenshot above, we can tell that a user’s list of repositories is located in a div called user-repositories-list, so this will be the focus of our scraping. This div contains list items that are the list of repositories.
2. List item that contains a single repo’s info / relevant info on DOM tree The next part shows us the location of a single list item that contains a single repository’s information. We can also see this section as it appears on the DOM tree.
3. Location of the repository’s name and link Inside a single list item, there is a href link that contains a repository’s name and link.
4. Location of repository’s description
5. Location of repository’s language

For our simple scraper, we will extract the repo name, description, link, and the programming language.

Scraper Setup

We’ll first set up our virtual environment to isolate our work from the rest of the system, then activate the environment. Type the following commands in your shell or command prompt:
mkdir scraping-example
cd scraping-example

If you’re using a Mac, you can use this command to active the virtual environment:
python -m venv venv-scraping

On Windows the virtual environment is activated by the following command:
venv-scrapingScriptsactivate.bat

Finally, install the required packages:
pip install bs4 requests

The first package, requests, will allow us to query websites and receive the websites HTML content as rendered on the browser. It is this HTML content that our scraper will go through and find the information we require.

The second package, BeautifulSoup4, will allow us to go through the HTML content, then locate and extract the information we require. It allows us to search for content by HTML tags, elements, and class names using Python’s inbuilt parser module.

The Simple Scraper Function

Our function will query the website using requests and return its HTML content.

The next step is to use BeautifulSoup library to go through the HTML and extract the div that we identified contains the list items within a user’s repositories. We will then loop through the list items and extract as much information from them as possible for our use.

You may have noticed how we extracted the programming language. BeautifulSoup does not only allow us to search for information using HTML elements but also using attributes of the HTML elements. This is a simple trick to enhance accuracy when working with programming-related data sets.

That’s it! You have successfully built your Github Repository Scraper and can test it on a bunch of other users’ repositories. You can check out Kite’s Github repository to easily access the code from this post and others from their Python series.

Now that you’ve built this scraper, there are myriad possibilities to enhance and utilize it. For example, this scraper can be modified to send a notification when a user adds a new repository. This would enable you to be aware of a developer’s latest work. (Remember when I mentioned that scraping tools are useful in finance? Maintaining your own scraper and setting up notifications for new data would be very useful in that setting).

Another idea would be to build a browser extension that displays a user’s repositories on hover at any page on Github. The scraper would feed data into an API that serves the extension. This data will be then served and displayed on the extension. You can also build a comparison tool for Github users based on the data you scrape, creating a ranking based on how actively users update their repositories or using keyword detection to find repositories that are relevant to you.

What’s Next?

We covered the basics of web scraping in this post and only touched a few of the many use cases for it. requests and beautifulsoup are powerful and relatively simple tools for web scraping, but you can also check out some of the more advanced libraries I highlighted at the beginning of the post for even more functionality. The next steps would be to build more complex scrapers that could be made of multiple scraping functions from many different sources. There are endless ways these scrapers can be integrated into any project that would benefit from data that’s publicly available on the web. Eventually, you’ll have so many web scraping functions running that you’ll have to start thinking about moving your computation to a home server or the cloud!

This post is a part of Kite’s new series on Python. You can check out the code from this and other posts on our GitHub repository.

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In this tutorial, we will learn how to scrap web using selenium and beautiful soup. I am going to use these tools to collect recipes from a food website and store them in a structured format in a database. The two tasks involved in collecting the recipes are:

• Get all the recipe urls from the website using selenium
• Convert the html information of a recipe webpage into a structed json using beautiful soup.

For our task, I picked the NDTV food as a source for extracting recipes.

Selenium

Selenim Webdriver automates web browsers. The important use case of it is for autmating web applications for the testing purposes. It can also be used for web scraping. In our case, I used it for extracting all the urls corresponding to the recipes.

Installation

I used selenium python bindings for using selenium web dirver. Through this python API, we can access all the functionalities of selenium web dirvers like Firefox, IE, Chrome, etc. We can use the following command for installing the selenium python API.

Selenium python API requires a web driver to interface with your choosen browser. The corresponding web drivers can be downloaded from the following links. And also make sure it is in your PATH, e.g. /usr/bin or /usr/local/bin. For more information regarding installation, please refer to the link.

I used chromedriver to automate the google chrome web browser. The following block of code opens the website in seperate window.

Traversing the Sitemap of website

The website that we want to scrape looks like this:

Web Scraping With Python Pdf

We need to collect all the group of the recipes like categories, cusine, festivals, occasion, member recipes, chefs, restaurant as shown in the above image. To do this, we will select the tab element and extract the text in it. We can find the id of the the tab and its attributes by inspect the source.In our case, id is insidetab. We can extract the tab contents and their hyper links using the following lines.

We need to follow each of these collected links and construct a link hierachy for the second level.

When you load the leaf of the above sub_category_links dictionary, you will encounter the following pages with ‘Show More’ button as shown in the below image. Selenium shines at tasks like this where we can actually click the button using element.click() method.

For the click automation, we will use the below block of code.

Now let’s get all the recipes in NDTV!

Beautiful Soup

Now that we extracted all the recipe URLs, the next task is to open these URLs and parse HTML to extract relevant information. We will use Requests python library to open the urls and excellent Beautiful Soup library to parse the opened html.

Here’s how an example recipe page looks like:

soup is the root of the parsed tree of our html page which will allow us to navigate and search elements in the tree. Let’s get the div containing the recipe and restrict our further search to this subtree.

Inspect the source page and get the class name for recipe container. In our case the recipe container class name is recp-det-cont.

Let’s start by extracting the name of the dish. get_text() extracts all the text inside the subtree.

Web Scraping Python Beautifulsoup Github Pdf

Now let’s extract the source of the image of the dish. Inspect element reveals that img wrapped in picture inside a div of class art_imgwrap.

BeautifulSoup allows us to navigate the tree as desired.

Finally, ingredients and instructions are li elements contained in div of classes ingredients and method respectively. While find gets first element matching the query, find_all returns list of all matched elements.

Web Scraping Python Beautifulsoup Github Pdf

Overall, this project allowed me to extract 2031 recipes each with json which looks like this: