python中如何删除元组的元素

>>> a = ("aaa","bbb","ccc","ddd","eee","fff")
>>> a[:2] + a[3:]   ## 删除元素ccc
('aaa', 'bbb', 'ddd', 'eee', 'fff')
>>> a[:2] + a[4:]    ## 删除元素ccc和ddd
('aaa', 'bbb', 'eee', 'fff')