![]() So many themes, plugins can help people quickly build a CMS which meet the requirement. Think about why people like to use Wordpress to build CMS instead of other frameworks, the key is ecosystem. Very few people have talked about this before when comparing web scraping tools. If your project needs more customization such as proxy, data pipeline, then the Scrapy might be your choice here. So if your project is small, the logic is not very complex and you want job done quickly, you can use Selenium to keep your project simple. Scrapy Tutorial #9: How To Use Scrapy Item ![]() You can check this artcile to see how to quickly save the scraped data into Database by using Scrapy pipeline without modifying the code of spider. ![]() After you develop several Scrapy projects, you will benefit from the architecture and like its design because it is easy to migrate from existing Scrapy spider project to another one. Your Scrapy project can be both robust and flexible. The architecture of Scrapy is well designed, you can easily develop custom middleware or pipeline to add custom functionality. If the data size is big, Scrapy is the better option because it can save you a lot of time and time is a valuable thing. Scrapy only visit the url you told him, but Selenium will control the browser to visit all js file, css file and img file to render the page, that is why Selenium is much slower than Scrapy when crawling. Data Sizeīefore coding, you need to estimiate the data size of the extracted data, and the urls need to visit. If you are faced with this situation, I recommend you to use Selenium instead. ![]() But in some cases the data show up after many ajax/pjax requests, the workflow make it hard to use Scrapy to extract the data. If the data is included in html source code, both frameworks can work fine and you can choose one as you like. You should use some tool such as Dev Tool from Chrome to help you figure out how the data is displayed on the dynamic page of target site. When you compare Selenium vs Scrapy to figure out what is the best for your project, you should consider following issues. Selenium is only used to automate web browser interaction, Scrapy is used to download HTML, process data and save it. The two Python web scraping frameworks are created to do different jobs. Scrapy has built-in support for extracting data from HTML sources using XPath expression and CSS expression. When you do something asynchronously, you can move on to another task before it finishes. When you do something synchronously, you wait for it to finish before moving on to another task. The biggest feature is that it is built on Twisted, an asynchronous networking library, so Scrapy is implemented using a non-blocking (aka asynchronous) code for concurrency, which makes the spider performance is very great.įor those who have no idea what is asynchronous, here is a simple explanation. Scrapy is a web crawling framework for developer to write code to create spider, which define how a certain site (or a group of sites) will be scraped. Even Selenium is mainly use to automate tests for web applications, it can also be used to develope web spider, many people has done this before. That is why it is so popular in developer community. from selenium import webdriverįrom import Keysįrom the code above, you can see, the API is very beginner-friendly, you can easily write code with Selenium. For example, you can make browser visit craigslist, click target elemnt or navigate to the target page, get the html source code of page. The tests writen by developer can again most web browsers such as Chrome, IE and Firefox.Īs you can see, you can write Python script to control the web brwoser to do some work automatically. It provides a way for developer to write tests in a number of popular programming languages such as C#, Java, Python, Ruby, etc. Selenium is a framework which is designed to automate test for web applications. This is the #11 post of my Scrapy Tutorial Series, in this Scrapy tutorial, I will talk about the features of Scrapy and Selenium, Compare them, and help you decide which one is better for your projects.
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