Welcome to the world of web development with Flask! As a micro web framework for Python, Flask is perfect for building lightweight applications. Let's dive into the essentials.

1. Install Flask 📦

Start by installing Flask using pip:

pip install Flask

📌 Tip: For production, use pip install Flask==2.0.1 to ensure stability.

2. Create Your First App 🧱

from flask import Flask
app = Flask(__name__)

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

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

Run this script and visit http://localhost:5000 to see your first "Hello, Flask!" message. 🎉

3. Route & Template 🧭

  • Define routes with @app.route()
  • Render templates using render_template()
  • Example: 
    @app.route('/about')
def about():
    return render_template('about.html')
    Application_Structure

4. Database Integration 🗄️

Use SQLAlchemy for ORM:

from flask_sqlalchemy import SQLAlchemy
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
db = SQLAlchemy(app)

🔗 Explore Flask-SQLAlchemy documentation for advanced features.

5. Run & Debug 🚀

  • app.run() starts the development server
  • debug=True enables real-time reloading
  • Always disable debug mode in production!

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For more tutorials, check out our Flask tutorial series. 📚