Learn how to install the Flask framework on your system: The simple steps to install the Flask framework

Flask Framework Installation Guide: Easy to get started with the installation method of Flask framework, specific code examples are required

Introduction:
Flask is a lightweight web application Framework, developed based on Python. It is easy to learn and powerful, suitable for rapid development of small or medium-sized web applications. This article will introduce how to install the Flask framework and provide specific code examples to help readers easily install the Flask framework.

1. Preparation
Before starting to install the Flask framework, we need to ensure that the Python environment has been installed in the system. If Python is not installed on your system, please install Python first.

2. Install the Flask framework
The installation of the Flask framework is very simple and can be installed through the Python package management tool pip. Enter the following command in the console or terminal to install the Flask framework:

pip install flask

The system will automatically download and install the latest version of the Flask framework.

3. Verify installation
After the installation is completed, we can verify whether the Flask framework is successfully installed through a simple sample code. Create a Python file named app.py. The code in the file is as follows:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, Flask!'

if __name__ == '__main__':
    app.run()

Execute the following command to start the Flask application:

python app.py

Enter # in the browser ##http://localhost:5000/, if you see "Hello, Flask!" displayed on the page, it means that the Flask framework has been successfully installed and running.

In actual development, we may need to perform some configurations on the Flask application. For example, modify the application host and port number, set debugging mode, etc. Flask provides a configuration file
config.py, which we can modify to configure the Flask application. The following is a simple configuration file example:

DEBUG = True
HOST = '0.0.0.0'
PORT = 5000

app.py and modify the application configuration:

from flask import Flask
from config import *

app = Flask(__name__)
app.config.from_object(__name__)

@app.route('/')
def hello_world():
    return 'Hello, Flask!'

if __name__ == '__main__':
    app.run(host=HOST, port=PORT, debug=DEBUG)

app. py file, the Flask application will be started according to the settings in the configuration file.

This article introduces the installation method of the Flask framework and provides specific code examples. By referring to this article, readers can easily install and run the Flask framework, laying the foundation for subsequent development of web applications.

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