## Powerful and elegant list derivation expression in python

The derivation expression is actually to simplify some loop judgment operations, etc How many ways can you generate a list of numbers 1-10? >>> l = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] >>> l [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> >>> l = [] >>> for x in range( 1, 11 ): ... l.append( x ) ...

Posted by tinuviel on Thu, 02 Apr 2020 21:38:33 +0200

## BZOJ4710: [Jsoi2011] special products (principle of tolerance and exclusion + combinatorial mathematics + DP)

Title gate: http://www.lydsy.com/JudgeOnline/problem.php?id=4710 Topic analysis: at first, I didn't have a clue at all. Later, I found out that this is just like the second kind of stirling number? First of all, consider how to do without the condition that everyone should take at least one specialty. Because different speci ...

Posted by Paulkirkewalker on Tue, 31 Mar 2020 19:10:03 +0200

## Detailed explanation of PHP FFI -- a new PHP extension method

With PHP7.4, there is an extension that I think is very useful: PHP FFI (Foreign Function interface), which refers to a description in PHP FFI RFC: For PHP, FFI provides a way to write PHP extensions and bindings to C libraries in pure PHP. Yes, FFI provides high-level languages to call each other directly. For PH ...

Posted by Johan Beijar on Mon, 30 Mar 2020 12:07:14 +0200

## PHP Clean Code (Part 2)

PHP Clean Code (Part I) Use default parameters instead of short circuit operation or condition judgment Bad practice: This is not good because \$breweryName can be NULL function createMicrobrewery(\$breweryName = 'Hipster Brew Co.'): void { // ... } 　　 It's OK: This approach is easier to understand than the above, but it needs to contr ...

Posted by Kiubbo on Fri, 27 Mar 2020 11:33:02 +0100

## PHP Clean Code (Part 1)

introduce Software Engineer Guidelines for Robert C.Martin's Clean Code The same applies to PHP.It is not a guide to coding style, it guides us to write readable, reusable, and decomposable code in PHP. Not all guidelines must be strictly followed, even some have become common conventions.This is just a guideline, many of which are years of ex ...

Posted by Kalland on Fri, 27 Mar 2020 09:16:14 +0100

## solidity test case practice

Truffle development framework provides two methods for testing Ethereum smart contract: solid testing at blockchain level and JavaScript testing at DApp level. In this tutorial, we will introduce the purpose, difference and application scenario of these two testing methods of Ethereum smart contract, and learn how to use the solid test case and ...

Posted by Demonic on Thu, 26 Mar 2020 04:11:33 +0100

## Actual Ethereum smart contract test [Truffle]

Truffle development framework provides two methods for testing Ethereum smart contract: solid testing at blockchain level and JavaScript testing at DApp level. In this tutorial, we will introduce the purpose, difference and application scenario of these two testing methods of Ethereum smart contract, and learn how to use the solid test case and ...

Posted by scheols on Thu, 26 Mar 2020 03:33:25 +0100

## Tihinkphp3.2 integrate the latest version of Alibaba fish to send SMS verification code

Posted by Neomech on Fri, 20 Mar 2020 16:43:03 +0100

## PHP implementation of RabbitMQ message queue

First, install RabbitMQ corresponding to PHP. Here we use PHP ﹣ AMQP to implement different extension methods with slight differences php extension address: http://pecl.php.net/package/amqp The details are subject to the official website http://www.rabbitmq.com/getstarted.html introduce config.php configuration information BaseMQ.php MQ base ...

Posted by poseidix on Tue, 17 Mar 2020 16:17:27 +0100

## CentOS7.X installs Redis-4.0.8 and builds Redis clusters

My personal website Install redis Preparation before installation yum install \ vim \ wget \ make \ gcc \ gcc-c++ \ automake \ autoconf \ -y \ Download, unzip and install cd /root wget http://download.redis.io/releases/redis-4.0.8.tar.gz tar -zxzf redis-4.0.8.tar.gz cd redis-4.0.8 make PREFIX=/usr/local/redis/ install Create the data file ...

Posted by chrisv on Tue, 17 Mar 2020 12:24:00 +0100