Page 75-Flask framework Programming Tutorials: Learn Flask framework Online-php.cn

Article Tags

Home

Technical Articles

Backend Development

How Python uses the web framework Flask to develop projects

1. Introduction Flask is a lightweight Python-based web framework. The code in this document runs using Python3. It is recommended to practice command line operations and execute code in this tutorial under Linux. 2. Installation Install Flask through pip3: $sudopip3installFlask Enter python interactive mode to see the introduction and version of Flask: $python3>>>importflask>>>print(flask.__doc__)flask~~~~~AmicroframeworkbasedonWerkzeug.It

May 13, 2023 pm 05:19 PM

Python web Flask

How to use contextvars module in python

Note that after Python 3.7, the contextvars module appeared in the official library. Its main function is to add context functions to multi-threading and asyncio ecology. Even if the program is running concurrently with multiple coroutines, the context of the program can be called. Variables, thereby decoupling our logic. Context can be understood as the context in which we speak. During the chat process, if some words are separated from the specific context, their meaning changes, and the same goes for the running of the program. In The thread also has its own context, which is just called a stack. For example, in python, it is stored in the thread.local variable. The coroutine also has its own context, but it is not exposed, but with contextva

May 13, 2023 pm 12:04 PM

Python contextvars

What is the method of debugging in Python?

Logging is a must If you write an application without some kind of logging setup, you will end up regretting it. Without any logs in the application, it is difficult to troubleshoot any errors. Fortunately, in Python, setting up a basic logger is very simple: importlogginglogging.basicConfig(filename='application.log',level=logging.WARNING,format='[%(asctime)s]{%(pathname)s :%(lineno)d}%(levelname)s-

May 12, 2023 pm 08:13 PM

Python

javascript calls python method

In the front-end development process, it is often necessary to use back-end languages to implement some complex computing logic or data processing operations. The Python language has powerful data processing capabilities and support for various libraries, so it is widely used in front-end development. This article will introduce you to how to use JavaScript to call Python methods. 1. Prerequisites Before you start using JavaScript to call Python methods, you need to understand the following points: 1. Installation and configuration of the Python environment. 2. Installation of Node.js environment

May 12, 2023 am 10:44 AM

How to install and use the Python Flask framework module?

1. Overview PythonFlask is a lightweight web application framework written in Python for rapid development of web applications and APIs. It is designed with simplicity, ease of use and scalability in mind. Here are some of the key features of PythonFlask: Lightweight: Flask has no redundant libraries and toolkits, making it very lightweight, which also means you can add your own libraries as needed. Ease of use: Flask’s API is very simple and easy to understand and learn, so it is perfect for beginners. Extensibility: Flask is extensible, you can add plugins to enhance its functionality, and it can be easily integrated with other libraries and frameworks. Flexibility: Flask allows you to choose

May 09, 2023 pm 10:37 PM

Python Flask

ajax delete data javascript

With the rapid development of the Internet and the continuous advancement of IT technology, ajax technology is used in many web applications to implement the partial refresh function, thus improving the user experience and page response speed. In some scenarios where data needs to be deleted, ajax can also be used to perform the deletion operation, so that there is no need to refresh the entire page, and users can also see the deletion effect immediately on the page. This article will introduce how to use javascript and ajax technology to delete data. Step 1: Write an HTML file. First, create an HTML file locally or on the server.

May 09, 2023 am 09:16 AM

Use Python Flask to build an efficient and concise URL shortening service

1. Set up the Flask application First, create a new directory for your project and open a terminal in that directory. Then, run the following command to create a new virtual environment for your project: #Forwindows:virtualenvvenv#Forlinux:python3-mvenvvenv Activate the virtual environment by running the following command: #Forwindowsvenv/Scripts/activate#Forlinuxsourcevenv/bin/activate Next, pass Run the following command to install Flask: pipinstallFlask Create a new file named

May 08, 2023 pm 05:34 PM

Python Flask URL

How to write Python applications using Flask Blueprint and SQLAlchemy

Installation preparation python3-V&&pip3-Vpip3installpipenvpipenvpipenvshellPyCharm’s environment configuration will not be explained too much here. Here is an explanation of the subsequent code. To start practicing the Flask principle, when the App is initialized, the blueprint and the App are bound to implement the Web routing function. The implementation of routing is the first step in all projects. Entry File Before starting the project, define an entry file to allow requests to instantiate the App. What the entry file needs to do is initialize the configuration file, introduce the controller, initialize the database and other operations. defcreate_app():app=Flask(

May 06, 2023 pm 07:28 PM

Python sqlalchemy

Python's powerful signal library: blinker

1. Signal Hello everyone, I am my cousin~ Signal is a way of notification or communication. Signal is divided into sender and receiver. The sender sends a signal, and the process of the receiver receiving the signal will jump into the signal processing function. After execution, it will jump back to the original position to continue execution. A common signal in Linux, inputting Ctrl+C through the keyboard, is to send a signal to the system to tell the system to exit the current process. The characteristic of a signal is that the sender notifies the subscriber of what happened. Using signals is divided into three steps: defining the signal, monitoring the signal, and sending the signal. The communication module that provides the signal concept in Python is blinker. Blinker is a powerful signal library based on Python that supports both simple

May 03, 2023 am 08:10 AM

Python blinker 信号库

Which one has better performance, nodejs or python?

With the development of computer technology, various programming languages have emerged. Among them, Node.js and Python are two very popular programming languages that are widely used to develop various applications. But when using these two languages, many developers often face a common question: Which one has better performance, Node.js or Python? To answer this question, we need to analyze it from the following aspects. 1. Language Features Node.js is built based on the Google Chrome V8 engine.

Apr 26, 2023 am 09:08 AM

Use GPT-3 to build an enterprise chatbot that meets your business needs

Background Chatbots or customer service assistants are AI tools that hope to deliver business value through text or voice delivery to users over the Internet. The development of chatbots has progressed rapidly in the past few years, from the initial robots based on simple logic to the current artificial intelligence based on natural language understanding (NLU). For the latter, the most commonly used frameworks or libraries when building such chatbots include foreign RASA, Dialogflow and AmazonLex, as well as domestic major manufacturers Baidu, iFlytek, etc. These frameworks can integrate natural language processing (NLP) and NLU to process input text, classify intent, and trigger the right actions to generate responses. With the advent of large language models (LLMs), we can directly use these models to build

Apr 24, 2023 pm 09:43 PM

聊天机器人 AI工具

Will golang replace python in the future?

In recent years, with the rapid development of Internet technology and the continuous progress of society, programming languages have been constantly updated, and some emerging programming languages are gradually replacing the status of old programming languages. Among them, golang, as a new generation of high-performance programming language, has become the first choice of many enterprises and developers. Some even think that golang may replace python in the future. As a high-level language with simple syntax and easy to learn, Python has always been a popular programming tool, especially in artificial intelligence, data science, and We

Apr 24, 2023 pm 03:48 PM

Which is better, python or JavaScript?

With the continuous development of the digital age, programming languages are becoming more and more important in the IT industry, and Python and JavaScript are currently popular programming languages. Both languages have their own characteristics and advantages, but which one is better? This article will conduct a comparative analysis of these two languages so that readers can better choose which language is suitable for them to learn and use. 1. Introduction to Python and JavaScript Python is an interactive programming language and is widely used in data analysis, machine learning, artificial intelligence, etc.

Apr 24, 2023 pm 02:47 PM

Learn Python Celery and easily complete asynchronous tasks

While modern web applications are faster and more convenient than ever, there are still many situations where heavy lifting needs to be offloaded to other parts of the system rather than being performed on the main thread. Examples of these situations include the following: Periodic tasks – jobs that are scheduled to run at specific intervals. For example, daily, monthly report generation. Third Party Tools - Applications should return responses quickly to the user rather than waiting for other tasks to complete first. For example, send emails, notifications, communicate update progress to internal tools. Long-running jobs – jobs that perform complex or resource-expensive work and the user needs to wait for the job to complete. For example. DAG workflow, Map-Reduce based tasks, long-running Spa

Apr 23, 2023 pm 03:31 PM

Python Celery 验证