Programmer Think

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 ) ...

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 ...

  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 ...

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 ...

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 ...

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 ...

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 ...

Alida fish's latest download address: Alibig fish SDK Download Or download from the official website: Alibaba big fish SDK official website download After downloading, put the API ﹣ SDK folder in the compressed package into the ThinkPHP\Library\Vendor directory, and change the file name to Aliyun. If you want to change it to another name, plea ...

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 ...

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 ...