def get_item_with_id(self, uid):
        """
        Returns item for defined UID.

        >>> book.get_item_with_id('image_001')

        :Args:
          - uid: UID for the item

        :Returns:
          Returns item object. Returns None if nothing was found.
        """
        for item in self.get_items():
            if item.id == uid:
                return item

        return None
Returns item for defined UID.

        >>> book.get_item_with_id('image_001')

        :Args:
          - uid: UID for the item

        :Returns:
          Returns item object. Returns None if nothing was found.