python crawler crawls webpage pictures

Articles Catalogue Preface Knowledge content Dead work start 1. Browser opens destination page and F12 Analysis page structure 2. Crawling page elements through Beautiful Soup 3. Save pictures Preface When doing crawling, first of all, we ...

Posted by expert_21 on Tue, 20 Aug 2019 23:17:07 -0700

Flink Stream API - Operators

Operators convert one or more data streams into a new data stream.Programs can combine multiple transformations into complex data flow topologies. Describes basic transformations, valid physical partitions after applying these transformations, a ...

Posted by michaelphipps on Tue, 20 Aug 2019 18:09:13 -0700

cplex-Branch and Bound algorithm calls cplex to solve VRPTW

Previously, we talked about Cplex's direct solution model for VRPTW, and now we call Cplex in the branch and bound algorithm to solve VRPTW.1. Branch and Bound Algorithms (1) Definition:(2) Solving process: 1) Determine a lower bound (initial solutio ...

Posted by n_wattam on Mon, 19 Aug 2019 19:03:13 -0700

Incremental and Distributed

day14~Incremental and Distributed Articles Catalogue @[toc] 1. Installation of redis 2. Crawl Spider-based data crawling 3. Distributed 4. Incremental Formula 5.scrapy improves data crawling efficiency 6. Virtual Environment Yesterday's revie ...

Posted by Corona4456 on Mon, 19 Aug 2019 05:50:17 -0700

It's enough for nginx to watch this once.

Articles Catalogue What is nginx? nginx application scenario Installing Nginx in Windows Advantages and disadvantages of nginx nginx implements reverse proxy What is Load Balancing Load Balancing Strategy nginx for load balancing nginx implements ...

Posted by tom100 on Sun, 18 Aug 2019 05:12:59 -0700

Conventional Design and Example of Current Limitation

Current Limiting Algorithms Counter Current Limitation Fixed window sliding window Barrel current limiting Token Bucket Leaky bucket Counter Counter current limiting can be divided into: Fixed window sliding window Fixed window The current limitation of fixed window counter is simple and clear, that is, to limit the number of requests ...

Posted by zurron on Sat, 17 Aug 2019 08:42:10 -0700

Java Development Notes (138) JavaFX Box

The use of JavaFX tag control was introduced earlier. It was mentioned that Label text supports Chinese fonts. What Chinese fonts does it support? Naturally, it depends on which fonts are installed in the current operating system. For the Chinese Windows system, the default installation is "SimHei" in bold, NSimSun in Song, Fang Song ...

Posted by narch31 on Fri, 16 Aug 2019 23:45:14 -0700

c++ controls the color of font output

c++ controls the color of font output _____ The default text color for the output box of a C++ console program is white, so I often refer to its output box as a black and white box.However, this text style is not fixed, it can change the color of the ...

Posted by danoli on Fri, 16 Aug 2019 23:07:18 -0700

Screen Capture Function Analysis of Android 8.1 MTK Platform

Preface The source code involved is frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\screenshot\TakeScreenshotService.javavendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\screenshot\GlobalScreenshot.java The ...

Posted by codersrini on Fri, 16 Aug 2019 04:48:13 -0700

File system function os module sub-module os.path pickle

os module In the os module, there are many methods, some are related to directories, some are related to system files and so on. It encapsulates the API written by C language on linux operating system, such as creating files, creating directory API ...

Posted by iShaun on Thu, 15 Aug 2019 22:04:19 -0700