environs: simplified environment variable parsing

environs is a Python library (current version 15.0.1) designed for simplified parsing of environment variables, aligning with the Twelve-Factor App methodology for separating configuration from code. It provides robust type-casting, validation, and flexible parsing of various data types including lists, dictionaries, dates, and URLs. It also integrates seamlessly with `.env` files. environs is actively maintained and has a steady release cadence.