Recently, Python's web crawler framework Scrapy has released the official version 1.0, which brings many important upgrades and improvements to Scrapy. This article will introduce some important updates and improvements brought by the new version of Scrapy.
- Twisted-based asynchronous network engine
In version 1.0, Scrapy replaced the previous concurrency engine with a Twisted-based asynchronous network engine. Twisted is an excellent event-driven framework that supports asynchronous IO and network programming, and Scrapy itself also relies on Twisted. Using an asynchronous network engine based on Twisted can make Scrapy more efficient and stable.
- New Selector
In version 1.0, Scrapy introduces a new Selector, which is implemented based on the lxml library. Compared with the old Selector, the new Selector is faster and more stable, and also supports more selector languages such as XPath and CSS selectors. In addition, the new Selector also supports nested nodes, that is, using the "/" character in the selector expression to select parent nodes and child nodes.
- New Item Pipeline
In version 1.0, Scrapy introduces a new Item Pipeline that is more flexible and easier to use. The new Item Pipeline supports multiple processors and can send data to different processors for processing as needed, such as databases, files, etc. In addition, the new Item Pipeline can also filter and sort data to meet various needs.
- New command line tools
In version 1.0, Scrapy introduces new command line tools, making Scrapy easier to use. The new command line tool provides many new commands for debugging, testing, and optimizing crawling code. For example, you can use the "check" command to check the syntax errors of the crawler code, use the "spider" command to start the crawler and output the results, etc.
- Other improvements
In addition to the important updates mentioned above, Scrapy version 1.0 has some other improvements. For example, the exception handling mechanism has been optimized to make Scrapy more robust and reliable. In addition, version 1.0 also provides a new data storage format, supporting the direct saving of data into JSON, XML and other formats without the need for additional conversion and processing.
Summary:
The 1.0 version of Scrapy brings many important improvements and updates, making it more efficient, flexible and easy to use. Features such as the new version of the Twisted-based asynchronous network engine, new Selector, new Item Pipeline, and new command line tools take Scrapy to the next level. For crawler developers, Scrapy version 1.0 is undoubtedly a version worth looking forward to and using.
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