有很大的不同.

1. 集不能包含重复项
2. 集合是无序的
3. 为了在集合中查找元素，使用了哈希查找(这就是为什么集合无序的原因).这使得__contains__(in运算符)的集合比列表更有效.
4. 集合只能包含可哈希项(请参阅#3).如果尝试:set(([1],[2]))，您将得到一个TypeError.

1. Sets can't contain duplicates
2. Sets are unordered
3. In order to find an element in a set, a hash lookup is used (which is why sets are unordered). This makes __contains__ (in operator) a lot more efficient for sets than lists.
4. Sets can only contain hashable items (see #3). If you try: set(([1],[2])) you'll get a TypeError.

在实际应用中，列表很容易排序和排序，而当您不想重复且不关心顺序时，可以很好地使用集合.

In practical applications, lists are very nice to sort and have order while sets are nice to use when you don't want duplicates and don't care about order.

还请注意，如果您不关心订单等，可以使用

new_set = myset.intersection(mylist)

以获得set和list之间的交集.

to get the intersection between a set and a list.