The essence of a crawler is to capture valuable data from the target websites. Therefore, every website will more or less adopt some anti crawler technology to prevent crawlers. For example, the user-agent request header is used to verify whether it is a browser, and JavaScript is used to load resources dynamically. These are the […]
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MySql is a very popular relational SQL database server software. It is widely used in huge of websites as a database server. This article will tell you how to install the MySql database server and GUI client tool on macOS to make MySql database management easy. It will also tell you how to start, stop,
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This article introduces how to use the Python XLWT library to generate excel spreadsheet tables and export the excel file to HTTP client in Django.
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When you create an iOS app and run it in a simulator, you may find that the default app icon on the screen is a grid picture, this is not beautiful. This article will tell you two methods about how to change the default iOS app icon to your desired icon both in a simulator
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If you are a beginner to Node.js, you must want to know which function can read user input from the command line. Just like the input() function in Python. This example will show you how to get user input data from the command line in Node.js application. One way is to use Node.js build-in process.stdin
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This article will tell you how to use the Python requests module to retrieve a web page content by page URL and then save the web page content to a local file step by step.
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Android background service is an android component that runs in the background. There is no GUI for users to interact with the android background service object directly, it is usually started in android activity and runs in the same thread of the activity. When users quit the android-activity, the android background service will also exit
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Scrapy is a Python library that can be used to crawl web pages and extract the web page elements by XPath or CSS selector in python code. This article will tell you how to create a Scrapy project and how to implement the Scrapy related classes in the project to crawl and extract a job
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Android foreground service is an android service object. It always runs in the foreground, this can avoid service objects being recycled by the android system when android os does not have enough resources. Android foreground service can interact with users through notification. It is usually used in a music player, file downloader, etc which user
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Python matplotlib module is used to draw graphical charts. This article will tell you how to use matplotlib to draw points and lines. But before you can use it, you should make sure it is installed. You can follow the below steps to check, if there is no error message printed out, then it means
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