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ytt (pronounced spelled out) is a templating tool that understands YAML structure. It helps you easily configure complex software via reusable templates and user provided values. Ytt includes the following features:
Structural templating: understands yaml structure so users can focus on their configuration instead of issues associated with text templating, such as YAML value quoting or manual template indentation
Built-in programming language: includes the "fully featured" Python-like programming language Starklark which helps ease the burden of configuring complex software through a richer set of functionality.
Reusable configuration: You can reuse the same configuration in different environments by applying environment-specific values.
Custom validations: coupled with the fast and deterministic execution, allows you to take advantage of faster feedback loops when creating and testing templates
Overlays: this advanced configuration helps users manage the customization required for complex software. For more, see this example in the online playground.
Sandboxing: provides a secure, deterministic environment for execution of templates