Python去除列表中的重复元素

1.用集合

2.list(set(l))

用字典

l1 = ['b','c','d','b','c','a','a']

l2 = {}.fromkeys(l1).keys()

print l2

3.用字典并保持顺序l1 = ['b','c','d','b','c','a','a']

l2 = list(set(l1))

l2.sort(key=l1.index)

print l2

4.列表推导式

l1 = ['b','c','d','b','c','a','a']

l2 = []

[l2.append(i) for i in l1 if not i in l2]