select implementation of python-io multiplexing

1. I/O multiplexing refers to a mechanism by which multiple descriptors can be monitored. Once a descriptor is ready (generally read ready or write ready), the program can be notified to perform corresponding read and write operations. 2. I/O multiplexing can avoid blocking on io. The message originally received by multiple processes or thread ...

Posted on Tue, 29 Oct 2019 13:40:01 -0400 by SephirGaine

C ා NETCORE ා web project ා EXCEL data export

The project needs to refer to NPOI's Nuget package:   There are three ways to trigger downloading Excel from A-front end: 1-JS-Url jump request - the background needs to return the file stream data: window.Location.href = "/ajax/toolhelper.js?action=reBuyExport&beginTime=" + beginTime + "&endTime=" + endTime; 2 - use form+ifram ...

Posted on Tue, 29 Oct 2019 13:08:29 -0400 by godfrank

Think.js configuration database

Think.js configuration database Method Preparation Extend model capabilities The Think.js framework does not provide the function of model by default. It needs to load the corresponding extension to support. The corresponding module is think model. Modify the extended configuration file src/config/extend.js, and add the following configurati ...

Posted on Tue, 29 Oct 2019 11:09:12 -0400 by matbennett

python reads and writes to redis using the pipeline

In daily development, we always need to write some files to the cache. In addition, python provides a very useful api to help us connect to redis. In this case, you will use the rediscluster package to connect to the redis cluster and use the pipeline pipeline to insert files. # encoding: utf-8 from red ...

Posted on Mon, 28 Oct 2019 10:39:29 -0400 by ghostcoder

Common methods of arrays in JS

First of all, let's understand what an array is before we start. 1. What is array? An array is a collection of data. Its representation is a continuous memory address in memory. The array name is actually the first address of the continuous memory address. In other words, it is to store a bunch of data ...

Posted on Sun, 27 Oct 2019 06:09:42 -0400 by Cinquecento

Learn Spring's annotation and Schema to implement AOP

Summary In the previous article, we learned how to implement AOP by implementing the interface and XML configuration. Before implementing AOP by annotation, we first learned about AspectJ. AspectJ is a face-to-face framework. It extends the Java language, defines the AOP syntax, and implements code injection at compile time. Spring implements ...

Posted on Sun, 27 Oct 2019 02:54:31 -0400 by callmubashar

Mengxin's 2019 Hackergame trip to CUHK

Mengxin's 2019 Hackergame trip to CUHK Sign in problem White and night ~~Cyberpunk ~ ~ information security 2077 The ultimate problem of the universe Web page reader Unusual python exam The leaked ginger Dalabengba big adventure Flag red envelope Sign in problem f12, paste the token, remove the ...

Posted on Sun, 27 Oct 2019 01:49:14 -0400 by learntoreed

Adding, deleting, modifying and querying XML documents in Java

1. Introduction to XML XML is the abbreviation of eXtensible Markup Language, which is a subset of SGML. It is used to provide data description format and is suitable for data exchange between different applications. Moreover, this exchange does not take a predefined set of data structures as the pr ...

Posted on Sun, 27 Oct 2019 00:41:51 -0400 by krellen

Python super detailed string usage

String splicing Actual scenario: concatenate the data in the list into a string Solution: use the str.join() method >>> li = ['cxk', 'cxk', 'kk', 'caibi'] >>> ''.join([str(i) for i in li]) 'cxkcxkkkcaibi' Generator expressions are recommended. If the list is large, you can save a lot of memory space >>> ''.join(str(i) ...

Posted on Sat, 26 Oct 2019 09:33:57 -0400 by MoldRat

fs module of NodeJS

Article directory 1 fs introduction 2 common methods 2.1 readFileSync() 2.2 writeFileSync() 2.3 exists(path, callback) 2.4 mkdir(),writeFile(),readfile() 2.4.1 mkdir method 2.4.2 the WriteFile method is used to write files 2.4.3 the readfile method is used to read the file content 2.5 mkdirSync( ...

Posted on Sat, 26 Oct 2019 04:47:51 -0400 by kanuski