Programmer Group

Effect preview Online demo Press the "click preview" button on the right to preview on the current page, and click the link to preview in full screen. https://codepen.io/comehope/pen/jKVbyE Interactive video tutorial This video is interactive. You can pause the video at any time and edit the code in the video. Please use chrome, safa ...

Background needs At the same time of finishing the task, practice the crawler, and use the Xpath to match the content to be crawled; News interface to be crawled Information to be crawled Implementation code #!/usr/bin/env python # -*- coding: utf-8 -*- # @Time : 2019/3/13 13:08 # @Author : cunyu # @Site : cunyu1943.github.io # @File ...

First of all, we will discuss how to use Alipay to pay in Laravel applications. For this, there are many related packages on GitHub, among which the two most popular packages are Omnipay For Laravel 5 & Lumen and Laravel AliPay. Laravel Alipay is used to illustrate the case: Preparation: Alipay account / ant gold service open platform accou ...

Summary The global secondary index has the same storage structure as the main table. Its index column can be the primary key column or predefined column of the main table, and its attribute column is the predefined column of the main table. The data written to the main table is asynchronously synchronized to the global secondary index after a ...

As you should all know, Android's messaging mechanism is based on Handler.Remember that I read several blogs a year ago and thought I knew Handler, Looper and MessageQueue.However, in fact, slowly during the process of looking at the source code, you will find that the contents of Handler are more than this, such as synchronization barrier, b ...

A simple example of using FeignClient is as follows: 1. Add maven dependency <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> <version>2.0.2.RELEASE</version> </dependency> <dependency> <groupId& ...

When dealing with the network, we often encounter the situation that the network requests depend on each other. For example, the parameter of B request depends on the callback result of A request. If B is requested directly in the callback of A request, it will lead to the nesting of callbacks, which leads to the tight coupling bet ...

Problem DescriptionWhen creating a Model, if a field of type DateTimeField exists, the list index out of range is reported when adding to the Model in the xadmin back-end management interface. This is the Model created in the last article: class IDC(models.Model): name = models.CharField(max_length=64) contact = models.CharField(max_length=32) ...

email SSL You can find online tutorials on using golang to send and encrypt messages. Sending a simple text message is very simple, but when you need to send an attachment, you basically need to github.com/scorredoira/email. If you want to send encrypted mail with attachments, the combination of mail construction and encryption processing is a ...

Project brief introduction Data-Factory It is used to generate initialization information randomly and automatically according to the object, which avoids the tedious of creating the object manually and is easy to test. Characteristic 8 basic types of support String, Date, amount, Date and other common types of support Java 8 common time class ...