What are the best practices for handling API keys securely when making requests with Cloudflare Workers and Python?

Never hardcode API keys directly into your Worker code. Instead, store them as environment variables within your Cloudflare Worker configuration. Access these environment variables using `import os; api_key = os.environ['API_KEY']`. Alternatively, use a secrets management service like Cloudflare's Secrets Management or a third-party solution to store and retrieve sensitive information securely. Always invalidate cache after changing the API key.