Programming VIP

This note is based on Small mound teaching video The notes are detailed and not boring. They are recommended to students who want to learn target detection. The following personal notes are for your reference. If there are errors, please correct them! Target detection: location + Category Face detection: face target Text detection: text ta ...

Serialization and deserialization of python (json and pickle) 1, What is serialization and deserialization 1. Serialization Convert a language variable into a json format stringThe data structure * * ---- > in memory is converted into an intermediate format (string) ----- > * * and saved in a file 2. Deserialization Convert json ...

Creation of super large data set class Previously, we only touched on data sets that can store all data in memory. The data set classes corresponding to these data sets load all data into memory when creating objects. However, if the data set is super large, it is difficult for us to have enough memory to store all the data completely. Therefo ...

1, Create project The project is based on GitHub Hosting websites for source code 1. Create a remote repository of source code: blog 2. Clone remote warehouse Note: git needs to be installed. Enter "git" on the windows terminal to test the environment Note: you need to install the virtual environment (pyt ...

@TOC xpath crawls to university ranking 700 (python3) Reptile thinking There are no more than four steps for a crawler, [find data], [parse data], [extract data], [save data] Find data Data found. Find the website you want to crawl, the content you want to crawl, and the website of this article : http://www.gaosan.com/gaokao/196075.html , ...

Introduction When it comes to Python's libraries, you may first think of the following: NumPy: for matrix computing, machine learning;pandas: NumPy-based data processing for standard Excel/SQL tables, or Tidyverse for R;SciPy: Scientific calculation, standard MATLAB;statsmodels: Used for metrological modeling, AER for standard R, or Stata ...

1. Preface Two years ago today, I wrote an article entitled Writing Spring Festival couplets in Python: expressing the most sincere blessings and best wishes The article has attracted the attention of many calligraphy lovers. This article is written in regular script by teacher Tian Yingzhang. I found a total of 1600 Chinese characters on the ...

This paper makes a visual data analysis of stock data. (tushare ID: 452043) Introduction to tushareData crawlingData visualization analysis 3.1. Trend in recent three years 3.2. Maximum range of stock points 3.3. Daily low point analysis 3.4. High and low point analysissummary Code part 1. Introduction to tushare Tushare is a free and o ...

We often see such a thing on the smart car. This thing is an ultrasonic ranging module with four pins: VCC, trig, echo and GND. VCC: connected to VCC power supply, generally 5V, but now there are also 3.3V power supplies on the market Trig: input a 10us high level to this pin to trigger ranging. Echo: at the end of ranging, this pin will out ...

Detailed explanation of python crawler 1. Basic concepts 1.1 what is a reptile Web crawler is a program or script that automatically grabs Internet information according to certain rules. Other infrequently used names include ants, automatic indexing, emulators, or worms. With the rapid development of the network, the world wide web has beco ...