env-tools

import os from env_tools import load_env, get_env, EnvNotFoundError # --- Example .env file content (assume this is in a file named .env) --- # MY_APP_DEBUG=True # DATABASE_URL=postgresql://user:pass@host:5432/db # API_KEY=abc-123-xyz # WORKERS=4 # ---------------------------------------------------------------------- # Load environment variables from the .env file in the current directory. # By default, load_env doesn't raise an error if the .env file is missing. # Set critical=True to make file loading mandatory. load_env() # Access environment variables with optional type casting and defaults debug_mode = get_env("MY_APP_DEBUG", cast_to_type=bool, default=False) db_url = get_env("DATABASE_URL") api_key = get_env("API_KEY", default="default_api_key_if_not_set") workers = get_env("WORKERS", cast_to_type=int) # No default, will raise EnvNotFoundError if missing print(f"Debug Mode: {debug_mode} (Type: {type(debug_mode)})") print(f"Database URL: {db_url}") print(f"API Key: {api_key}") print(f"Workers: {workers} (Type: {type(workers)})") # Demonstrating a missing variable without a default try: get_env("UNDEFINED_VAR_NO_DEFAULT") except EnvNotFoundError as e: print(f"\nCaught expected error for missing variable: {e}") # OS environment variables take precedence over .env file values os.environ['API_KEY'] = 'overridden_key_from_os' # No need to reload load_env, subsequent get_env calls will check os.environ first print(f"API Key (OS override): {get_env('API_KEY')}") # Clean up the OS environment variable after the example del os.environ['API_KEY']