The Best Way to Manage .Env Variables in Python (Flask, Django, FastAPI)

Managing .env variables in python can get messy fast, especially once you start working with Flask, Django, FastAPI, API keys, database URLs, secret keys, and different development, staging, and production environments. In this video, I’ll show you the best way to manage environment variables in Python applications, how .env files work, how to load secrets safely, and how to avoid hardcoding sensitive values like an API key directly into your code. We’ll cover: How .env files work in Python Managing environment variables in Flask Managing environment variables in Django Managing environment variables in FastAPI Why you should never hardcode API keys Better ways to manage secrets across local development and production, such as the Infisical CLI or Python SDK. If you’re building Python web apps, APIs, automation scripts, or backend services, understanding environment variables is one of those foundational skills that will save you a ton of pain later. Keywords: API key, python, Python environment variables, .env file, Flask environment variables, Django environment variables, FastAPI environment variables, python-dotenv, secrets management, API keys, database URL, secret key, Python backend development Follow Infisical: Website: https://infisical.com LinkedIn:   / infisical   GitHub: https://github.com/Infisical Twitter / X: https://x.com/infisical Slack: https://infisical.com/slack