How to create a Simple Flask app in just 5 minutes | Python Flask Tutorial for beginners

How to Create a Simple Flask App in Just 5 Minutes

Step 1: Introduction to Flask

• Flask is a lightweight Python framework for web applications that provides basics for URL routing and page rendering.
• It is a micro framework that requires additional Python packages called Flask extensions for features like form validation, database abstraction, and authentication.

Step 2: Setting Up the Environment

1. Open Visual Studio Code editor.
2. Create a new directory for your Flask project. For example, "simple-flask-app".
3. Create and activate a virtual environment using the following commands:
   • python -m venv venv (to create the virtual environment)
   • Navigate to the virtual environment directory and activate it using .\Scripts\activate (for Windows) or source bin/activate (for Mac/Linux).

Step 3: Installing Flask

1. Install Flask in the virtual environment by running the following commands:
   • Upgrade pip: python -m pip install --upgrade pip
   • Install Flask: python -m pip install flask

Step 4: Creating the Flask Application

1. Create a new Python file named app.py in your project directory.
2. Inside app.py, import Flask and create a basic Flask application with a route that returns "Hello World" when accessed.
3. Sample code snippet for app.py:

   from flask import Flask
   
   app = Flask(__name__)
   
   @app.route('/')
   def hello():
       return 'Hello World from Flask'
   
   if __name__ == '__main__':
       app.run()
   

Step 5: Running the Flask App

1. Run the Flask application using the command:
   • python -m flask run or python -m flask --app app.py run
2. Access the Flask app in your web browser to see the output.
3. To stop the application, use Ctrl + C.

Step 6: Conclusion

• Congratulations! You have successfully set up a simple Flask app using Visual Studio Code in just a few minutes.
• Stay tuned for more advanced Flask tutorials in the future.

Additional Notes:

• If you encounter any issues or have questions, feel free to ask in the comment section of the video.
• Thank you for watching and have a nice day!