A.List,Set都是继承自Collection接口
B.List特点:元素有放入顺序,元素可重复
C.Set特点:元素无放入顺序,元素不可重复,重复元素会覆盖掉
D.Set:插入和删除会引起元素位置改变,List插入和删除不会引起元素位置改变
In the US; there is a long waiting list for orgasm because ______.
A.there is a shortage of actual organs
B.only a few people become organ donors
C.doctors have set a limit to the number of organ recipients
D.transplant surgery is still experimental
A.new_list=set(old_list)
B.new_list=list(old_list)
C.new_list=list(dir(old_list))
D.new_list=list(set(old_list))