(self, items)
return self
Adds `items`, avoiding duplicates.

    Args:
      items: An iterable of items to add, or a single item to add.

    Returns:
      This instance of `QuietSet`.
Adds `items`, avoiding duplicates.
Adds items avoiding duplicates .
def __iadd__(self, items):
    """Adds `items`, avoiding duplicates.

    Args:
      items: An iterable of items to add, or a single item to add.

    Returns:
      This instance of `QuietSet`.
    """
    self._items.update(to_iterable(items))
    self._items.discard(None)
    return self
def __iadd__ ( self , items ) : self . _items . update ( to_iterable ( items ) ) self . _items . discard ( None ) return self