从嵌套列表中删除重复项

nested_list = [[1, 2], [3, 4], [1, 2], [5, 6]]

def remove_duplicates(nested_list):
    seen = set()
    result = []
    for item in nested_list:
        # 将列表转换为元组
        tuple_item = tuple(item)
        if tuple_item not in seen:
            seen.add(tuple_item)
            result.append(item)
    return result

# 示例
nested_list = [[1, 2], [3, 4], [1, 2], [5, 6]]
unique_list = remove_duplicates(nested_list)
print(unique_list)  # 输出: [[1, 2], [3, 4], [5, 6]]