{"id":14675,"library":"load-dotenv","title":"load-dotenv","description":"The `load-dotenv` library, currently at version 0.1.0, provides a lightweight wrapper that automatically and implicitly loads environment variables from `.env` files. It essentially re-exports the core functionality of the popular `python-dotenv` library, offering a simple interface to manage environment variables for development. It has a low release cadence given its wrapper nature.","status":"active","version":"0.1.0","language":"en","source_language":"en","source_url":"https://github.com/fly/load-dotenv","tags":["environment variables","config","dotenv","configuration"],"install":[{"cmd":"pip install load-dotenv","lang":"bash","label":"Install latest version"}],"dependencies":[{"reason":"Core functionality is provided by python-dotenv; load-dotenv is a wrapper re-exporting its functions.","package":"python-dotenv"}],"imports":[{"note":"While `load-dotenv` re-exports `python-dotenv`'s function, direct import from 'dotenv' bypasses this wrapper.","wrong":"from dotenv import load_dotenv","symbol":"load_dotenv","correct":"from load_dotenv import load_dotenv"}],"quickstart":{"code":"import os\nfrom load_dotenv import load_dotenv\n\n# Create a dummy .env file for demonstration\n# In a real scenario, this file would exist beforehand\nwith open('.env', 'w') as f:\n    f.write('DB_HOST=localhost\\n')\n    f.write('DB_USER=admin\\n')\n    f.write('DB_PASSWORD=secret_password\\n')\n\nload_dotenv() # take environment variables from .env.\n\n# Access environment variables\ndb_host = os.getenv(\"DB_HOST\")\ndb_user = os.getenv(\"DB_USER\")\ndb_password = os.getenv(\"DB_PASSWORD\")\n\nprint(f\"DB Host: {db_host}\")\nprint(f\"DB User: {db_user}\")\nprint(f\"DB Password: {db_password}\")\n\n# Clean up the dummy .env file\nos.remove('.env')","lang":"python","description":"Initializes environment variables by calling `load_dotenv()`. This will search for a `.env` file in the current directory and its parents, loading any key-value pairs found into `os.environ`. Access variables using `os.getenv()`."},"warnings":[{"fix":"To force `load-dotenv` to overwrite existing shell variables, pass `override=True` to the function: `load_dotenv(override=True)`.","message":"`load_dotenv()` does not overwrite existing environment variables by default.","severity":"gotcha","affected_versions":"All versions (inherent behavior of underlying `python-dotenv`)."},{"fix":"`load_dotenv()` searches for the `.env` file upwards from the current working directory. Ensure your `.env` file is in the project root or a parent directory, or explicitly provide the path: `load_dotenv(dotenv_path='/path/to/your/.env')`.","message":"The `.env` file location search behavior can be unexpected.","severity":"gotcha","affected_versions":"All versions (inherent behavior of underlying `python-dotenv`)."},{"fix":"`.env` files often contain sensitive information (API keys, database credentials). Always add `.env` to your `.gitignore` file. Use environment variables directly in production environments and consider dedicated secrets management systems.","message":"Committing `.env` files to version control poses a significant security risk.","severity":"gotcha","affected_versions":"All versions."},{"fix":"`KEY=\"value\"` will include the quotes in the loaded string. For standard string values, generally omit quotes (`KEY=value`). `KEY=` will result in an empty string (`''`), not `None`. Handle empty strings explicitly when accessing variables.","message":"Values with quotes or empty values are parsed literally, potentially leading to unexpected results.","severity":"gotcha","affected_versions":"All versions (inherent behavior of underlying `python-dotenv`)."}],"env_vars":null,"last_verified":"2026-04-16T00:00:00.000Z","next_check":"2026-07-15T00:00:00.000Z","problems":[{"fix":"Ensure `load_dotenv()` is called early in your application's entry point. Verify `MY_VAR` exists in your `.env` file and that the file is correctly placed (or specify `dotenv_path`). Use `os.getenv('MY_VAR', 'default_value')` to provide fallbacks and prevent `TypeError`.","cause":"The environment variable `MY_VAR` was not loaded, not present in the `.env` file, or the `.env` file itself was not found/loaded when accessing `os.environ['MY_VAR']` or calling a method on `os.getenv('MY_VAR')` when it returns `None`.","error":"KeyError: 'MY_VAR' or TypeError: 'NoneType' object is not subscriptable"},{"fix":"If you intend to prioritize values from `.env` over existing shell variables, call `load_dotenv(override=True)`.","cause":"`load_dotenv()` by default does not overwrite existing environment variables that were already set in the shell before the script runs.","error":"Environment variable not updating / Old value of variable is loaded"},{"fix":"Place your `.env` file in the project's root directory. Alternatively, provide the explicit path to your `.env` file using the `dotenv_path` argument: `load_dotenv(dotenv_path='/path/to/your/.env')`.","cause":"The `load_dotenv()` function couldn't locate a `.env` file in the current directory or any parent directories as it searches upwards.","error":"'.env file not found' (when expecting variables to load)"}],"ecosystem":"pypi"}