Python Web Scraping With Selenium

  1. Python Web Scraping Selenium Vs Beautifulsoup
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Build your own web scraping projects. Learn core components of two of the most powerful scraping libraries: BeautifulSoup and Selenium. How to click on a button, send text to an input box, and self-scroll using Selenium. Scraping data off of single page, multiple page, and infinite scrolling websites. 5 projects each with it's own unique challenge. Web Scraping with Python: Collecting Data From the Modern Web, by Ryan Mitchell (ISBN: 9276) Hands-on Web Scraping with Python: Perform advanced scraping operations using various Python libraries and tools such as Selenium, Regex, and others,. Selenium tools for Microsoft Edge – Execute the below command from the terminal to download the Selenium tools for Microsoft Edge directly: pip install msedge-selenium-tools selenium3.141. Now we can perform automation testing with Edge and Selenium in Python. Web scraping with Python is easy due to the many useful libraries available. A barebones installation isn’t enough for web scraping. One of the Python advantages is a large selection of libraries for web scraping. For this Python web scraping tutorial, we’ll be using three important libraries – BeautifulSoup v4, Pandas, and Selenium.

Web scraping is a very useful mechanism to either extract data, or automate actions on websites. Normally we would use urllib or requests to do this, but things start to fail when websites use javascript to render the page rather than static HTML. For many websites the information is stored in static HTML files, but for others the information is loaded dynamically through javascript (e.g. from ajax calls). The reason maybe because the information is constantly changing, or it maybe to prevent webscraping! Either way, you need to more advanced techniques to scrape the information – this is where the library selenium can help.

What is web scraping?

To align with terms, web scraping, also known as web harvesting, or web data extraction is data scraping used for data extraction from websites. The web scraping script may access the url directly using HTTP requests or through simulating a web browser. The second approach is exactly how selenium works – it simulates a web browser. The big advantage in simulating the website is that you can have the website fully render – whether it uses javascript or static HTML files.

What is selenium?

According to selenium official web page, it is a suite of tools for automating web browsers. This project is a member of the Software Freedom Conservancy, Selenium has three projects, each provides a different functionality if you are interested in it, visit their official website. The scope of this blog will be attached to the Selenium WebDriver project

When should you use selenium?

Selenium is going to facilitate us with tools to perform web scraping, but when should it be used? You generally can use selenium in the following scenarios:

  • When the data is loaded dynamically – for example Twitter. What you see in “view source” is different to what you see on the page (The reason is that “view source” just shows the static HTML files. If you want to see under the covers of a dynamic website, right click and “inspect element” instead)
  • When you need to perform an interactive action in order to display the data on screen – a classic example is infinite scrolling. For some websites, you need to scroll to the bottom of the page, and then more entries will show. What happens behind the scene is that when you scroll to the bottom, javascript code will call the server to load more records on screen.

So why not use selenium all the time? It is a bit slower then using requests and urllib. The reason is that selenium simulates running a full browser including the overhead that a brings with it. There are also a few extra steps required to use selenium as you can see below.

Once you have the data extracted, you can still use similar approaches to process the data (e.g. using tools such as BeautifulSoup)

Pre-requisites for using selenium

Step 1: Install selenium library

Before starting with a web scraping sample ensure that all requirements have been set, Selenium requires pip or pip3 installed, if you don’t have it installed you can follow the official guide to install it based on the operating system you have.

Once pip is installed you can proceed with the installation of selenium, with the following command

Alternatively, you can download the PyPI source archive (selenium-x.x.x.tar.gz) and install it using setup.py:

Step 2: Install web driver

Selenium simulates an actual browser. It won’t use your chrome installation but it will use a “driver” which is the browser engine to run a browser. Selenium supports multiple web browsers, so you may chose which web browser to use (read on)

Selenium WebDriver refers to both the language bindings and the implementations of the individual browser controlling code. This is commonly referred to as just a web driver.

Web driver needs to be downloaded, and then it could be either added to the path environment variable or initialized with a string containing the path where downloaded web driver is. Environment variables are out of the scope of the blog so we are going to use the second option.

From here to the end Firefox web driver is going to be used, but here is a table containing information regarding each web driver, you are able to choose any of them, Firefox is recommended to follow this blog

Download the driver to a common folder which is accessible. Your script will refer to this driver.

You can follow our guide on how to install the web driver here.

A Simple Selenium Example in Python

Ok, we’re all set. To begin with, let’s start with a quick staring example to ensure things are all working. Our first example will involving collecting a website title. In order to achieve this goal, we are going to use selenium, assuming it is already installed in your environment, just import webdriver from selenium in a python file as it’s shown in the following.

Running the code below will open a firefox window which looks a little bit different as can be seen in the following image and at the then it prints into the console the title of the website, in this case, it is collecting data from ‘Google’. Results should be similar to the following images:

Note that this was run in foreground so that you can see what is happening. Now we are going to manually close the firefox window opened, it was intentionally opened in this way to be able to see that the web driver actually navigates just like a human will do. But now that it is known, we can add at the end of the out this code: driver.quit() so the window will automatically be closed after the job is done. Code now will look like this.

Now the sample will open the Firefox web driver do its jobs and then close the windows. With this little and simple example, we are ready to go dipper and learn with a complex sample

How To Run Selenium in background

In case you are running your environment in console only or through putty or other terminal, you may not have access to the GUI. Also, in an automated environment, you will certainly want to run selenium without the browser popping up – e.g. in silent or headless mode. This is where you can add the following code at the start “options” and “–headless”.

The remaining examples will be run in ‘online’ mode so that you can see what is happening, but you can add the above snippet to help.

Python Web Scraping With Selenium

Example of Scraping a Dynamic Website in Python With Selenium

Until here, we have figure out how to scrap data from a static website, with a little bit of time, and patience you are now able to collect data from static websites. Let’s now dive a little bit more into the topic and build a script to extract data from a webpage which is dynamically loaded.

Imagine that you were requested to collect a list of YouTube videos regarding “Selenium”. With that information, we know that we are going to gather data from YouTube, that we need the searching result of “Selenium”, but this result will be dynamic and will change all the time.

The first approach is to replicate what we have done with Google, but now with YouTube, so a new file needs to be created yt-scraper.py

Now we are retrieving data YouTube title printed, but we are about to add some magic to the code. Our next step is to edit the search box and fill it with the word that we are looking for “Selenium” by simulating a person typing this into the search. This is done by using the Keys class:

from selenium.webdriver.common.keys import Keys.

The driver.quit() line is going to be commented temporally so we are able to see what we are performing

The Youtube page shows a list of videos from the search as expected!

As you might notice, a new function has been called, named find_element_by_xpath, which could be kind of confusing at the moment as it uses strange xpath text. Let’s learn a little bit about XPath to understand a bit more.

What is XPath?

XPath is an XML path used for navigation through the HTML structure of the page. It is a syntax for finding any element on a web page using XML path expression. XPath can be used for both HTML and XML documents to find the location of any element on a webpage using HTML DOM structure.

The above diagram shows how it can be used to find an element. In the above example we had ‘//input[@id=”search”]. This finds all <input> elements which have an attributed called “id” where the value is “search”. See the image below – under the “inspect element” for the search box from youTube, you can seen there’s a tag <input id=”search” … >. That’s exactly the element we’re searching for with XPath

There are a great variety of ways to find elements within a website, here is the full list which is recommended to read if you want to master the web scraping technique.

Looping Through Elements with Selenium

Python web scraping with selenium

Now that Xpath has been explained, we are able to the next step, listing videos. Until now we have a code that is able to open https://youtube.com, type in the search box the word “Selenium” and hit Enter key so the search is performed by youtube engine, resulting in a bunch of videos related to Selenium, so let’s now list them.

Firstly, right click and “inspect element” on the video section and find the element which is the start of the video section. You can see in the image below that it’s a <div> tag with “id=’dismissable'”

We want to grab the title, so within the video, find the tag that covers the title. Again, right click on the title and “inspect element” – here you can see the element “id=’video-title'”. Within this tag, you can see the text of the title.

Python Web Scraping With Selenium

One last thing, let’s remind that we are working with internet and web browsing, so sometimes is needed to wait for the data to be able, in this case, we are going to wait 5 seconds after the search is performed and then retrieve the data we are looking information. Keep in mind that the results could vary due to internet speed, and device performance.

Once the code is executed you are going to see a list printed containing videos collected from YouTube as shown in the following image, which firstly prints the website title, then it tells us how many videos were collected and finally, it lists those videos.

Waiting for 5 seconds works, but then you have to adjust for each internet speed. There’s another mechanism you can use which is to wait for the actual element to be loaded – you can use this a with a try/except block instead.

Selenium

So instead of the time.sleep(5), you can then replace the code with:

This will wait up to a maximum of 5 seconds for the videos to load, otherwise it’ll timeout

Conclusion

With Selenium you are going to be able to perform endless of tasks, from automation tasks to automate testing, the sky is the limit here, you have learned how to scrape data from static and dynamic websites, performing javascript actions like send some keys like “Enter”. You can also look at BeautifulSoup to extract and search for data next

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Python Web Scraping Selenium Vs Beautifulsoup

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Table of Contents

In this tutorial, we first provide an overview of some foundational concepts about the World-Wide-Web. We then lay out some common approaches to web scraping and compare their usage. With this background, we introduce several applications that use the Selenium Python package to scrape websites.

This tutorial is organized into the following parts:

  1. Basic concepts of the World-Wide-Web.
  2. Comparison of some common approaches to web scraping.
  3. Use-cases for when to use the Selenium WebDriver.
  4. Illustration of how to find web elements using Selenium WebDriver.
  5. Illustration of how to fill in web forms using Selenium WebDriver.

We plan to add more applications in the near future. The content of this tutorial is a work in progress, and we are happy to receive feedback! If you find anything confusing or think the guide misses important content, please email: [email protected]

Python Web Scraping Selenium Login

Custom Websites

We decided to build custom websites for many of the examples used in this tutorial instead of scraping live websites, so that we have full control over the web environment. This provides us stability —– live websites are updated more often than books, and by the time you try a scraping example, it may no longer work. Also, a custom website allows us to craft examples that illustrate specific skills and avoid distractions. Finally, the maintainers of a live website may not appreciate us using them to learn about web scraping and could try to block our scrapers. Using our own custom websites avoids these risks, however, the skills learnt in these examples can certainly still be applied to live websites.

Below I list the name and its link for each of the custom websites we have built for this tutorial:

  • static student profile webpage
  • dynamic search form webpage
  • dynamic table webpage
  • dynamic search load webpage
  • dynamic complete search form webpage

Authors and Sources

Jinjie Liu at IQSS designed the structure of the guide and created the content. Steve Worthington at IQSS helped design the structure of the guide and edited the content. We referenced the following sources when we wrote this guide:

  • Web Scraping with Python: Scrape data from any website with the power of Python, by Richard Lawson (ISBN: 978-1782164364)
  • Web Scraping with Python: Collecting Data From the Modern Web, by Ryan Mitchell (ISBN: 978-1491910276)
  • Hands-on Web Scraping with Python: Perform advanced scraping operations using various Python libraries and tools such as Selenium, Regex, and others, by Anish Chapagain (ISBN: 978-1789533392)
  • Learning Selenium Testing Tools with Python: A practical guide on automated web testing with Selenium using Python, by Unmesh Gundecha (ISBN: 978-1783983506)