返回一个项目列表，该列表中不包含任何具有相同值的元素

project_list = [1, 2, 3, 2, 4, 5, 1, 6, 6]
unique_project_list = list(set(project_list))
print(unique_project_list)

project_list = [1, 2, 3, 2, 4, 5, 1, 6, 6]
project_list.sort()
unique_project_list = [project_list[0]]
for i in range(1, len(project_list)):
    if project_list[i] != project_list[i-1]:
        unique_project_list.append(project_list[i])
print(unique_project_list)