Python : 去除列表中的重复元素

用集合

list(set(l))
用字典

l1 = [‘b’,‘c’,‘d’,‘b’,‘c’,‘a’,‘a’]
l2 = {}.fromkeys(l1).keys()
print l2
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
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]
sorted排序并且用列表推导式.

l = [‘b’,‘c’,‘d’,‘b’,‘c’,‘a’,‘a’] [single.append(i) for i in sorted(l) if i not in single] print single