@classmethod
def delete_one(cls, strategy):
    """Deletes a single item in a table.
        You can perform a conditional delete operation that deletes the item if it exists,
        or if it has an expected attribute value.

        see :ref:`doc_delete_one`

        :return: The deleted item
        """
    cls._schema()
    keys, condition = cls._parse_one_strategy(strategy)
    return cls._delete_one(keys, condition)
