PyYAML Environment Variable Tag

pyyaml-env-tag (current version 1.1) is a Python library that provides a custom YAML tag (!ENV) for referencing environment variables within YAML files. This allows for dynamic configuration and injecting sensitive data securely. It builds upon the PyYAML library. The project has seen recent releases in 2025, suggesting active maintenance, though official release cadence isn't explicitly stated beyond these updates.