Flask 101

 

Installation:

1. Install Python:

   • Make sure Python is installed on your system. You can download it from python.org or use your system's package manager.

2. Install Flask:

   • Open a terminal or command prompt.

   • Run the following command to install Flask using pip:

   • pip install Flask

   • Create a Flask App:

     3. Create a Directory:

     • Create a new directory for your Flask project.

     • mkdir my_flask_app cd my_flask_app

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     • Create a Virtual Environment (Optional):

     • (Optional but recommended) Create a virtual environment to isolate your project dependencies:

     • python -m venv venv

     • Activate the virtual environment:

     • source venv/bin/activate

     • Create a Flask App:

     • Create a new file, e.g., app.py, and open it in a text editor.

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

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     • Run the Flask App:

       In the terminal, run the following command to start the Flask development server:

       python app.py

       
       

       Access the app in your web browser at http://127.0.0.1:5000/.

       
       

       Optional: Specify Port (Advanced):

       
       

       If you want to use a different port, you can specify it when running the app:

       python app.py --port=8080

       
       

       Access the app at http://127.0.0.1:8080/.

       
       

       Cleanup:

       Deactivate Virtual Environment (if used):

       If you used a virtual environment, deactivate it:

       
       

       deactivate

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