Programmer Group

Redhat 7.5 update yum yuan redhat 7.5 update centos yum source Installation steps (there must be a net) 1. * * view the system's own yum source and delete it** 2. * * go to the network source to download rpm package** 3. Install the downloaded yum source (find the file location and open in Terminal) 4. Create a new. repo fi ...

1. A common network request process in development url, parameter -- > request -- > Convert to Http protocol -- > request execution -- > return result -- > Convert to response -- > response convert to our object Only the head and tail are customized by our daily development, and other processes in the middle are carried out ...

1. requests module 1.1 introduction to requests Requests is a powerful, simple and easy-to-use HTTP request library. Compared with the previously used urllib module, the api of requests module is more convenient. (the essence is to encapsulate urlib3) You can use the pip install requests command to install, but it is easy to have network proble ...

Fabric CA is a certificate management tool of Hyperledger Fabric, which is very convenient for development and testing. In this tutorial, we will explore the use of fabric Ca and use it to complete user registration / Register and registration / Enrollment. Hyperledger Fabric is a licensed blockchain platform. Before accessing the Fabric networ ...

Today, I'd like to give you a little bit of fun. Use python to crawl the pictures to the local area. The website is https://www.pexels.com/ This website is a foreign language network, so the search image should be in English. What we need to do today is search and download the image in python, and make a web APP. Direct code from b ...

I've been home for a long time. I can't bear it. I want to climb up and play with some data. My notebook used to be a dual system of win7 plus ubuntu 16.04. I planned to write code in ubuntu, but when I came back home, it's always a purple screen. Baidu knows how to use it, but I can't solve it. A good brother can teach me. There's ...

Introduction to web application Web applications are everywhere in our lives. Take a look at the applications we use every day. They need to It's either a Web application or a variation of a Web application like a mobile App. No matter which programming language, as long as It can develop software that interacts with human beings, and it will c ...

Function Description: There is a message function in the interface. Click message to view the message list. Regularly send the request interface to the server to obtain the latest messages, and display the number of messages in the form of corner marks to the message function, Thus, users can intuitively know that they have received several m ...

Two systems of the company. Our A system should send A business contract application to B system. After receiving the data, system B will process it asynchronously and send A notice to our system A after signing. The interface document indicates that the asynchronous notification is sent through the post request of http protocol, and the me ...

For map coordinate migration, take leaflet as an example, there are the following solutions Method 1. Modify the source code of leaflet to solve the problem of map coordinate migration Method 2. Add the true latitude and longitude of the point to the encrypted map through the offset algorithm Method 3. Rectify the off-line map tile directly ...