Learn Flask framework installation skills: Detailed analysis of the installation steps of Flask framework

Detailed explanation of the installation steps of the Flask framework: Let you quickly master the installation skills of the Flask framework. Specific code examples are needed

Introduction:

Flask is a A lightweight Python web framework, it is simple, easy to use, flexible and powerful, so it is widely used in Python development. However, for newbies, installing Flask can be a little confusing. This article will introduce the installation steps of the Flask framework in detail, with specific code examples to help you get started quickly.

Step 1: Install Python

First, we need to install Python. Flask is developed based on Python, so you must ensure that Python is correctly installed on your development environment. You can download and install the latest version of Python from the official Python website (https://www.python.org).

Step 2: Create a virtual environment

Virtual environments can help us isolate projects and dependencies from the global environment and avoid problems caused by conflicting package versions that different projects depend on. Execute the following command on the command line to create a new virtual environment:

$ python3 -m venv myenv

Where "myenv" is the name of the virtual environment, you can name it according to your own preferences.

Step 3: Activate the virtual environment

On Windows, execute the following command to activate the virtual environment:

$ myenvScriptsctivate

On Linux or Mac, execute the following command to activate the virtual environment:

$ source myenv/bin/activate

After activating the virtual environment, you will notice that the command line prompt changes to the name of the virtual environment.

Step 4: Install Flask

With the virtual environment activated, execute the following command to install the Flask module:

$ pip install Flask

This will automatically download the Python Package Index (PyPI) Download and install the latest version of Flask.

Step 5: Verify the installation

After the installation is completed, we can write a simple Flask application to verify whether the Flask framework is successfully installed. Create a Python file named app.py in your favorite text editor and copy the following code into the file:

from flask import Flask

app = Flask(__name__)

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

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

After saving the file, return to the command line interface , with the virtual environment activated, execute the following command to run the application:

$ python app.py

If everything goes well, you will see output similar to the following on the command line:

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

This Indicates that the Flask application has successfully run on the local server. Now open your favorite browser and enter http://127.0.0.1:5000/ in the address bar, you will see the words Hello, Flask! displayed on the page .

Conclusion:

By following the above steps, you have successfully installed the Flask framework and verified the correctness of the installation. From now on, you can start developing web applications under the Flask framework. Flask provides rich functions and flexible extension mechanisms, and you can extend and customize your applications according to your needs. I hope this article will help you master the installation skills of the Flask framework.

Reference link:

• Flask official website: http://flask.pocoo.org/
• Python official website: https://www.python. org

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