在python列表中，删除相似或关闭的值，并且只写一次

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

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

my_list = [1, 2, 3, 2, 4, 3, 5, 6, 5]
new_list = []
for item in my_list:
    if item not in new_list:
        new_list.append(item)
print(new_list)

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

my_list = [1, 2, 3, 2, 4, 3, 5, 6, 5]
new_list = list(dict.fromkeys(my_list))
print(new_list)

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