Backend Development
Python Tutorial
Quickly get started with the Flask framework: Start with installation and quickly get started with the installation process of the Flask framework.
Quickly get started with the Flask framework: Start with installation and quickly get started with the installation process of the Flask framework.
Quick Start with Flask Framework: Start with Installation
Introduction:
Flask is a simple and flexible Python web framework that is widely used in the field of web development. It provides many useful tools and libraries to make developing web applications efficient and fast. This article will introduce you to how to install the Flask framework and get started quickly.
1. Install the Flask framework
- Install Python
Before you start using the Flask framework, you first need to install Python. Flask requires Python 2.7 or Python 3.3 and above. You can download the corresponding installation package from the Python official website (https://www.python.org/downloads/) and follow the prompts to install it. -
Install virtual environment
Using a virtual environment can effectively isolate the dependency packages required by the project and avoid conflicts with the system environment. Open the command line tool and execute the following command to install the virtual environment:pip install virtualenv
Copy after login Create a virtual environment
In the command line, enter the project directory and execute the following command to create a virtual environment:virtualenv venv
Copy after loginActivate the virtual environment
Execute the following command to activate the virtual environment:Windows:
venvScriptsctivate
Copy after loginLinux/Mac OS:
source venv/bin/activate
Copy after login
- ##Install Flask
In the activated virtual environment, execute the following command to install the Flask framework:
pip install flask
Copy after login
- Create an application directory
- In the project directory, create a folder named
appas our Flask application Table of contents. - Create application file
Create a Python file named
app.pyin theappdirectory and write the following code in it:from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return 'Hello, Flask!' if __name__ == '__main__': app.run()Copy after login - Start the application
Execute the following command to start the Flask application:
python app.py
Copy after loginAccess the application - Enter
http:/ in the browser /localhost:5000, you will see the page displays "Hello, Flask!".
The Flask framework allows us to handle different URL requests by defining routes. In the above example, we have defined a route
@app.route('/') which will handle the application root URL request. You can add more routes to handle other URL requests. The following is an example:
@app.route('/')
def hello():
return 'Hello, Flask!'
@app.route('/about')
def about():
return 'This is the About page.'
@app.route('/contact')
def contact():
return 'This is the Contact page.'http://localhost:5000/, http://localhost:5000/about respectively in the browser and http://localhost:5000/contact to view the output of different pages.
Flask uses a template engine to render dynamic content. The template engine can combine HTML templates with Python code to generate the final HTML page. The following is an example of using the template engine:
- Create template directory
- Create a folder named
templatesin theappdirectory, use To store HTML template files. - Create template file
Create an HTML template file named
index.htmlin thetemplatesdirectory, and write the following code:<!DOCTYPE html> <html> <head> <title>Flask Template</title> </head> <body> <h1 id="message">{{ message }}</h1> </body> </html>Copy after login - Modify the application file
Modify
app.py, introduce Flask’srender_templatefunction, and modify the return value of the routing processing function:from flask import Flask, render_template @app.route('/') def hello(): return render_template('index.html', message='Hello, Flask!')Copy after loginVisit the application - Restart the Flask application, and then visit
http://localhost:5000/, you will see the page showing "Hello, Flask!".
This article introduces how to install the Flask framework and get started quickly. You've learned to create a Flask application, use routing to handle URL requests, and use a template engine to render dynamic content. I hope that through the guidance of this article, you can quickly master the basic use of the Flask framework and be able to use it flexibly in future projects. I wish you good luck in learning and getting started with the Flask framework!
The above is the detailed content of Quickly get started with the Flask framework: Start with installation and quickly get started with the installation process of the Flask framework.. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Solution to the problem that Win11 system cannot install Chinese language pack
Mar 09, 2024 am 09:48 AM
Solution to the problem that Win11 system cannot install Chinese language pack With the launch of Windows 11 system, many users began to upgrade their operating system to experience new functions and interfaces. However, some users found that they were unable to install the Chinese language pack after upgrading, which troubled their experience. In this article, we will discuss the reasons why Win11 system cannot install the Chinese language pack and provide some solutions to help users solve this problem. Cause Analysis First, let us analyze the inability of Win11 system to
Unable to install guest additions in VirtualBox
Mar 10, 2024 am 09:34 AM
You may not be able to install guest additions to a virtual machine in OracleVirtualBox. When we click on Devices>InstallGuestAdditionsCDImage, it just throws an error as shown below: VirtualBox - Error: Unable to insert virtual disc C: Programming FilesOracleVirtualBoxVBoxGuestAdditions.iso into ubuntu machine In this post we will understand what happens when you What to do when you can't install guest additions in VirtualBox. Unable to install guest additions in VirtualBox If you can't install it in Virtua
What should I do if Baidu Netdisk is downloaded successfully but cannot be installed?
Mar 13, 2024 pm 10:22 PM
If you have successfully downloaded the installation file of Baidu Netdisk, but cannot install it normally, it may be that there is an error in the integrity of the software file or there is a problem with the residual files and registry entries. Let this site take care of it for users. Let’s introduce the analysis of the problem that Baidu Netdisk is successfully downloaded but cannot be installed. Analysis of the problem that Baidu Netdisk downloaded successfully but could not be installed 1. Check the integrity of the installation file: Make sure that the downloaded installation file is complete and not damaged. You can download it again, or try to download the installation file from another trusted source. 2. Turn off anti-virus software and firewall: Some anti-virus software or firewall programs may prevent the installation program from running properly. Try disabling or exiting the anti-virus software and firewall, then re-run the installation
How to install Android apps on Linux?
Mar 19, 2024 am 11:15 AM
Installing Android applications on Linux has always been a concern for many users. Especially for Linux users who like to use Android applications, it is very important to master how to install Android applications on Linux systems. Although running Android applications directly on Linux is not as simple as on the Android platform, by using emulators or third-party tools, we can still happily enjoy Android applications on Linux. The following will introduce how to install Android applications on Linux systems.
How to install creo-creo installation tutorial
Mar 04, 2024 pm 10:30 PM
Many novice friends still don’t know how to install creo, so the editor below brings relevant tutorials on creo installation. Friends in need should take a look at it. I hope it can help you. 1. Open the downloaded installation package and find the License folder, as shown in the figure below: 2. Then copy it to the directory on the C drive, as shown in the figure below: 3. Double-click to enter and see if there is a license file, as shown below As shown in the picture: 4. Then copy the license file to this file, as shown in the following picture: 5. In the PROGRAMFILES file of the C drive, create a new PLC folder, as shown in the following picture: 6. Copy the license file as well Click in, as shown in the figure below: 7. Double-click the installation file of the main program. To install, check the box to install new software.
How to install Podman on Ubuntu 24.04
Mar 22, 2024 am 11:26 AM
If you have used Docker, you must understand daemons, containers, and their functions. A daemon is a service that runs in the background when a container is already in use in any system. Podman is a free management tool for managing and creating containers without relying on any daemon such as Docker. Therefore, it has advantages in managing containers without the need for long-term backend services. Additionally, Podman does not require root-level permissions to be used. This guide discusses in detail how to install Podman on Ubuntu24. To update the system, we first need to update the system and open the Terminal shell of Ubuntu24. During both installation and upgrade processes, we need to use the command line. a simple
How to Install and Run the Ubuntu Notes App on Ubuntu 24.04
Mar 22, 2024 pm 04:40 PM
While studying in high school, some students take very clear and accurate notes, taking more notes than others in the same class. For some, note-taking is a hobby, while for others, it is a necessity when they easily forget small information about anything important. Microsoft's NTFS application is particularly useful for students who wish to save important notes beyond regular lectures. In this article, we will describe the installation of Ubuntu applications on Ubuntu24. Updating the Ubuntu System Before installing the Ubuntu installer, on Ubuntu24 we need to ensure that the newly configured system has been updated. We can use the most famous "a" in Ubuntu system
Detailed steps to install Go language on Win7 computer
Mar 27, 2024 pm 02:00 PM
Detailed steps to install Go language on Win7 computer Go (also known as Golang) is an open source programming language developed by Google. It is simple, efficient and has excellent concurrency performance. It is suitable for the development of cloud services, network applications and back-end systems. . Installing the Go language on a Win7 computer allows you to quickly get started with the language and start writing Go programs. The following will introduce in detail the steps to install the Go language on a Win7 computer, and attach specific code examples. Step 1: Download the Go language installation package and visit the Go official website
