Code
python
import os
from dotenv import load_dotenv
# Read env variable
db_url = os.getenv("DATABASE_URL", "sqlite:///default.db")
debug = os.getenv("DEBUG", "false").lower() == "true"
# Set env variable
os.environ["APP_MODE"] = "production"
# Load from .env file
load_dotenv()
api_key = os.getenv("API_KEY")
# Check existence
if "SECRET_KEY" not in os.environ:
raise RuntimeError("Missing SECRET_KEY")