python之如何删除列表中的重复值

Possible Duplicate:
How do you remove duplicates from a list in Python whilst preserving order?

让我们考虑一下列表:

x = ['a', 'b', 'c', 'c', 'a', 'd', 'z', 'z'] 

我想删除这些重复的值 list-x 并希望结果为:

y = ['a', 'b', 'c', 'd', 'z']