Deploy Python apps properly.

Requirements File

```bash # Create requirements.txt pip freeze > requirements.txt

Install from requirements pip install -r requirements.txt ```

Gunicorn (WSGI Server)

```bash # Install pip install gunicorn

Run Flask app gunicorn app:app

With workers gunicorn -w 4 -b 0.0.0.0:8000 app:app ```

Docker

```dockerfile # Dockerfile FROM python:3.11-slim

WORKDIR /app

COPY requirements.txt . RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["gunicorn", "-b", "0.0.0.0:8000", "app:app"] ```

```bash # Build and run docker build -t myapp . docker run -p 8000:8000 myapp ```

Environment Setup

```python # config.py import os

class Config: DEBUG = False TESTING = False DATABASE_URI = os.getenv('DATABASE_URI')

class ProductionConfig(Config): DEBUG = False

class DevelopmentConfig(Config): DEBUG = True

config = { 'development': DevelopmentConfig, 'production': ProductionConfig } ```

Systemd Service

```ini # /etc/systemd/system/myapp.service [Unit] Description=My Python App After=network.target

[Service] User=www-data WorkingDirectory=/var/www/myapp Environment="PATH=/var/www/myapp/venv/bin" ExecStart=/var/www/myapp/venv/bin/gunicorn -w 4 app:app

[Install] WantedBy=multi-user.target ```

Health Check Endpoint

```python from flask import Flask

app = Flask(__name__)

@app.route('/health') def health(): return {'status': 'healthy'}, 200

@app.route('/') def home(): return "Welcome to the app!" ```

Remember

- Use production WSGI server - Set DEBUG=False in production - Use environment variables - Monitor your application

> Congratulations! You've completed all Python tutorials from beginner to advanced!