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Learn LBM calculation method for the first time, find an excellent example of flow around a cylinder written in python language, add notes to each code in detail to help you summarize, and provide some help for beginners (all the codes are at the end of the article). Put a result image first: 1. Import module, only two required from numpy ...

day23 concurrent programming (Part 2) Course objective: master the relevant knowledge points of multi process development and preliminarily understand the collaborative process. Today's summary: Multi process developmentData sharing between processesProcess lockProcess poolSynergetic process 1. Multi process development Process is the sm ...

We often encounter all kinds of errors in writing strategies, which is very cumbersome, but it is an essential step in procedural trading. In fact, there are only a few reasons and types of errors in JoinQuant operation. python code format error, such as indentation and unequal usage - this can be basically solved by Baidu or google error pro ...

preface With its high development efficiency and powerful features, Python stands out among many programming languages and has become an analytical tool in the era of big data. According to my understanding for many years, programming language is just an efficient tool to realize specific functions according to people's intention. The core de ...

introduce In this section, we will learn about Python modules. Including the concept and import method of module, the concept and use of package, the introduction of third-party module, the use of command-line parameters, etc. Knowledge points Module importpackageIntroduction to default / third party moduleCommand line parameters modular S ...

catalogue Downloader Middleware 1, process_request(self, request, spider) 2, process_response(self, request, response, spider) 3, Random request header Middleware setting.py  middlewares.py httpbin.py 4, ip proxy pool Middleware 1. Purchasing agent 2. Using ip proxy pool 3. Exclusive agent pool   Downloader Middleware Downloader ...

Mybatis actual combat Tip: you can add the directories of all articles in the series here. You need to add the directories manually For example: the first chapter is the use of pandas, an introduction to Python machine learning Tip: after writing the article, the directory can be generated automatically. For how to generate it, please refer ...

Scratch + recruitment website crawler notes First look at the website to climb: https://sou.zhaopin.com/?jl=719&kw=%E8%8D%AF%E7%89%A9 Objective: to obtain the time, region, city, company, education requirements, experience requirements, salary level and other information of each city Check the source code. The source code can be extrac ...

Variable Tensor is a perfect component in PyTorch, but building neural network is far from enough. We need tensor that can build calculation graph, which is variable. Variable is the encapsulation of tensor. The operation is the same as that of tensor, but each Variabel has three attributes, and the tensor itself in variable data, correspo ...

12. Image smoothing 12.1 objectives Learn: - blur images with various low-pass filters - apply custom filters to images (2D convolution) 12.2 # 2D convolution (image filtering) Like the one-dimensional signal, various low-pass filters (LPF) and high pass filters (HPF) can also be used to filter the image. LPF helps to eliminate noise and blu ...