Public Approaches to Python Foundation

Common methods: Lists, tuples, dictionaries and strings can be used together. Python built-in functions Listing of built-in functions function describe Remarks len(item) Calculate the number of elements in the container del(item) Delete variables del has two methods max(item) Returns the maximum value of the element in the container I ...

Posted by flashbot on Wed, 08 May 2019 11:30:03 +0200

Nodejs/Php/Java Runtime for Table Storage Trigger Function Computing Example

Preface Function Compute is an event-driven service. Through function computing, users do not need to manage the operation of servers, but only write code and upload it. Function computing prepares computing resources and runs user code in a flexible and scalable manner, while users only need to pay for the resources consumed by running the act ...

Posted by blui on Wed, 08 May 2019 01:50:03 +0200

Creative Patterns: Factory Approach

Article firstCreative Patterns: Factory Approach brief introduction Name: Factory Method English name: Factory method Pattern Values: Expansion is my monopoly Personal introduction: Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Methods lets a class defer instantiation to subclasses. ...

Posted by FFEMTcJ on Tue, 07 May 2019 18:45:04 +0200

Ruby Array Method Arrangement

Array method collation Method List: all(), any(), none() and one() Testing whether all or part of the elements in an array satisfy a given condition. Conditions can be determined in a block of statements or parameters. append() Equivalent to push() bsearch() Dichotomy Finding Elements bsearch_index() Dichotomy Finds Elements and Returns ...

Posted by ricoche on Tue, 07 May 2019 13:35:03 +0200

Python 3 object-oriented programming, error and exception handling

Class and instance Classes are abstract templates, and instances are concrete "objects" created according to classes. Terminology explanation Class: A collection of objects that describe the same properties and methods. It defines the properties and methods common to each object in the set. Objects are instances of ...

Posted by kevgais on Tue, 07 May 2019 10:40:04 +0200

Redis 7000w+ keys && 16G memory 100% repair experience

cause We always use redis of Aliyun. We are not a high concurrent application. We mainly use redis as distributed locks and a small amount of caches. It hardly needs maintenance. Yesterday afternoon, we suddenly received an alarm email. On-line redis memory is used 100% and instantaneous nerve tension sensation is confirmed by console.This is a ...

Posted by jim_de_bo on Mon, 06 May 2019 15:00:04 +0200

Django Blog Series

Django Blog Series (I) Preface After learning Python for so long, I finally got to the Django framework. This can be said to be python's most famous web framework, so from today on, we will start to install the Django framework to use step-by-step learning. This series of blogs will not be as watery as the front end (flag), hoping to become a h ...

Posted by richclever on Mon, 06 May 2019 13:05:03 +0200

Python standard module and Python dir() function

Python A standard module library is attached and described in a separate document Python library reference (hereinafter referred to as "library reference"). Some modules are built into interpreters; they provide access to operations that are not part of the language core but are still built in to improve efficiency or provide access t ...

Posted by tpl41803 on Mon, 06 May 2019 02:40:02 +0200

npm usage tutorial

NPM What's this npm is to Node.js, just as pip is to Python, gem is to Ruby, and pear is to PHP.npm is the official package management tool provided by Node.js. It has become the standard platform for Node.js package publishing, dissemination and dependency control. npm provides command-line tools to make it easy to download, install, upgrade, ...

Posted by SBro on Sun, 05 May 2019 23:40:02 +0200

Lesson 086: Pygame: Collision Detection | Learning Records

Today we are going to learn collision detection. Most games need to do collision detection because you need to know whether the ball collided, whether the bullet hit the target, whether the protagonist stepped on the shit. How should that be achieved? To put it bluntly, the principle is simple, that is, to detect whether there i ...

Posted by TreeNode on Sun, 05 May 2019 15:48:04 +0200