1.利用集合去重

def deduplicate(items):
    return list(set(items))

2.利用空列表

def deduplicate(items):
    result = []
    for item in items:
        if item not in result:
            result.append(item)
    return result

3.利用字典的fromkeys

def deduplicate(items):
    return {}.fromkeys(items).keys()

4.利用reduce函数

def deduplicate(items):
    from functools import reduce
    return list(reduce(lambda x, y: x if y in x else x+[y], items, []))

5.利用sorted函数

def deduplicate(items):
    return sorted(list(set(items)), key=items.index)

6.利用groupby函数

def deduplicate(items):
    from itertools import groupby
    items.sort()
    tem_res = groupby(items)
    result = []
    for x, y in tem_res:
        result.append(x)
    return result

7.基本方法

def deduplicate(items):
    for i in range(len(items) - 1, -1, -1):
        for j in range(i - 1, -1, -1):
            if items[i] == items[j]:
                items.pop(i)
                break
    return items