Douki

Language-agnostic YAML docstrings for Python.

Douki is a developer tool that uses a structured YAML format inside Python docstrings. It keeps your docstrings in sync with your function signatures and validates them against a schema — all without adding a runtime dependency to your package.

Why Douki?

• Structured — docstrings are YAML, not free-form text. Parameters have type, description, optional, and default fields.
• Auto-synced — douki sync adds new parameters, removes stale ones, and updates return types automatically.
• Validated — every docstring is checked against a JSON Schema so typos and invalid fields are caught early.
• Dev-only — Douki is a development tool. It does not need to be a runtime dependency of your package.
• Migratable — convert existing NumPy-style docstrings with douki migrate numpydoc.

Quick Start

Install Douki as a dev dependency:

pip install douki

Write a docstring in Douki YAML format:

def add(a: int, b: int = 0) -> int:
    """
    title: Add two integers
    parameters:
      a:
        type: int
        description: First value.
      b:
        type: int
        description: Second value.
        default: 0
    returns:
      type: int
      description: Sum of a and b.
    """
    return a + b

Sync your docstrings with the actual signatures:

# Preview changes
douki check src/

# Apply changes in-place
douki sync src/

What's Next?

• Installation — install via pip, conda, or from source
• Usage Guide — CLI commands, YAML schema, and migration
• Changelog — release history
• Contributing — how to contribute