问如何在Python列表中找到重复元素

EN

mylist = [1,2,3,4,5,6,7,8,9,10,1,2]

def remove_duplicates(l):
    seen = {}
    res = []
    for item in l:
        if item not in seen:
            seen[item] = 1
            res.append(item)
    return res

print(remove_duplicates(mylist))

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

mylist = [1,10,3,4,5,6,7,8,9,2,1,2]
print(remove_duplicates(mylist))
[1, 10, 3, 4, 5, 6, 7, 8, 9, 2]

mylist = [1,2,3,4,5,6,7,8,9,10,1,2]
myset = set(mylist)
// myset = {1,2,3,4,5,6,7,8,9,10}

mylist = [1,2,3,4,5,6,7,8,9,10,1,2]

myset = set()
indices_of_duplicates = []

for ind, val in enumerate(mylist):
    if val in myset:
        indices_of_duplicates.append(ind)
    else:
        myset.add(val)

for ind in reversed(indices_of_duplicates):
    del mylist[ind]