Tag：list
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R language — commonly used but always unforgettable data processing tips
Time：2022-5-7##Extract elements in the list that contain specific characters DE.pattern = your_list[grep(pattern = “pattern”,x = names(your_list),value = T)] ##Batch read file names in the list library(pipeR) library(rlist) test = list.files(path = “E:/Desktop/”,pattern = “*” ) write.table(test,”E:/Desktop/readme.xls”,sep = “\t”) ###Read all sheets in Excel library(readxl) excel_ Path < – C (“your path / Annex 1 MRM […]
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Talk about dragon lizard hardware compatibility sig
Time：2022-5-6Editor’s note: what does dragon lizard community hardware compatibility sig mainly do? How compatible are the hardware devices with each distribution of the dragon lizard operating system? How to evaluate? Let’s talk about the hardware compatibility. This article is compiled from the 12th live broadcast of dragon lizard lecture hall technology. Wu Chaofeng, a core […]
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Python actual combat case, pywifi module, python brutally crack WiFi password of nearby LAN
Time：2022-5-6preface Today, I’ll show you Python script to decipher WiFi password. Without much nonsense, let’s start directly~ development tool Python version: 3.6.4 Related modules: Pywifi module; Datetime module; And some Python’s own modules. Environment construction Install Python and add it to the environment variable. PIP can install the relevant modules required. WiFi decoding source code […]
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MySQL source code reading: implementation of consistent reading
Time：2022-5-6InnoDB is a storage engine that supports mvcc (i.e. multi version concurrency control), and the consistent read function is based on mvcc. Based on the source code of MySQL 5.7, this paper discusses the principle of consistent reading, including snapshot creation, judging whether it is visible, snapshot closing, etc. premise This paper is based on […]
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RPM management package for Linux
Time：2022-5-6#Install package rpm -ivh zsh-5.5.1-6.el8.x86_64.rpm #Check whether the installation is successful rpm -q zsh #View the list of installed files rpm -ql zsh #Uninstall package rpm -e zsh #Ignore dependencies uninstall package rpm -e zsh –nodeps #Check whether the uninstallation is successful rpm -q zsh #Upgrade or install the software package. If it is not […]
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Source code analysis: spring boot startup process (I)
Time：2022-5-5Write in front Because I also read some corresponding spring related source code reading videos and articles first, but I still know a little about this part and am lazy, so I urge myself to read it as a whole in the way of recording. There will be many omissions. Please forgive me. The ultimate […]
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Fluent: introduction to bloc mode
Time：2022-5-5Original text:Fluent: introduction to bloc mode Learn how to use the popular bloc pattern to build a fluent application and use dart streams to manage the data flow through widgets. Designing the structure of an application is often one of the most controversial topics in application development. Everyone seems to have their favorite architectural model […]
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#Raise your hands and learn Python # list. Once you finish learning python, you will learn half of it
Time：2022-5-54、 As soon as you finish learning the list, python will be half 4.1 what is a list List, first remember that the English is list. It is a data type in python that can dynamically add and delete content, which is composed of a series of elements. To put it bluntly, a list is […]
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Front end multi data rendering optimization
Time：2022-5-4preface When I made a request some time ago, I came across the function of a custom list. All his data display is stored through the JSON string, which is also parsed through JSON. At first, he had a data upper limit, but later, after raising the upper limit, there were problems such as Caton,Therefore, […]
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Unicode coded Icon symbols JS, HTML, CSS
Time：2022-5-4List of commonly used Unicode symbols
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Baidu translation excel table
Time：2022-5-3import requests This work adoptsCC agreement, reprint must indicate the author and the link to this article
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List foundation of Python
Time：2022-5-2”’List: there are all types of data, and different types of data can be storedCan be accessed by subscript. Subscript starts at 0 ”’ List creation list_1 = [1,2,3,’4′] list_2 = list() ergodic for i in list_1: print(i, end=’ ‘) print(” “) Get list data according to subscript value = list_1[-1] #Print (‘last element:% s’% […]