去除列表中的重复元素
1 用集合 2 ```python 3 list(set(l)) 4 ``` 5 用字典 6 ```python 7 l1 = ['b','c','d','b','c','a','a'] 8 l2 = {}.fromkeys(l1).keys() 9 print l2 10 ``` 11 用列表并保持顺序 12 ```python 13 l1 = ['b','c','d','b','c','a','a'] 14 l2 = list(set(l1)) 15 l2.sort(key=l1.index) 16 print l2 17 ``` 以下用sorted
l1 = ['b','c','d','b','c','a','a'] l2=sorted(set(l1),key=l1.index) print(l2)
18 列表推导式 19 ```python 20 l1 = ['b','c','d','b','c','a','a'] 21 l2 = [] 22 [l2.append(i) for i in l1 if not i in l2]
