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Python Docstrings

Google Style (Recommended)

def calculate_total(items: list[Item], tax_rate: float = 0.0) -> float:
    """Calculate total cost including tax.

    Args:
        items: List of items to calculate total for.
        tax_rate: Tax rate as decimal (e.g., 0.08 for 8%).

    Returns:
        Total cost including tax.

    Raises:
        ValueError: If tax_rate is negative or items is empty.

    Example:
        >>> calculate_total([Item(10), Item(20)], 0.1)
        33.0
    """

NumPy Style

def calculate_total(items: list[Item], tax_rate: float = 0.0) -> float:
    """
    Calculate total cost including tax.

    Parameters
    ----------
    items : list[Item]
        List of items to calculate total for.
    tax_rate : float, optional
        Tax rate as decimal (e.g., 0.08 for 8%). Default is 0.0.

    Returns
    -------
    float
        Total cost including tax.

    Raises
    ------
    ValueError
        If tax_rate is negative or items is empty.

    Examples
    --------
    >>> calculate_total([Item(10), Item(20)], 0.1)
    33.0
    """

Sphinx Style

def calculate_total(items: list[Item], tax_rate: float = 0.0) -> float:
    """Calculate total cost including tax.

    :param items: List of items to calculate total for.
    :type items: list[Item]
    :param tax_rate: Tax rate as decimal (e.g., 0.08 for 8%).
    :type tax_rate: float
    :returns: Total cost including tax.
    :rtype: float
    :raises ValueError: If tax_rate is negative or items is empty.

    .. code-block:: python

        >>> calculate_total([Item(10), Item(20)], 0.1)
        33.0
    """

Class Documentation

class UserService:
    """Service for managing user operations.

    This service handles CRUD operations for users and
    integrates with the authentication system.

    Attributes:
        db: Database session for queries.
        cache: Redis client for caching.

    Example:
        >>> service = UserService(db, cache)
        >>> user = await service.create_user(data)
    """

    def __init__(self, db: AsyncSession, cache: Redis) -> None:
        """Initialize UserService.

        Args:
            db: Database session for queries.
            cache: Redis client for caching.
        """

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