具有相同键的字典中的Python列表

Question

I am running a python program using Visual Studio Code, and the data for it looks like this:

data = {
    [0, 0, 0] : 0,
    [0, 0, 1] : 0,
    [0, 1, 0] : 0,
    [0, 1, 1] : 0,
    [1, 0, 0] : 1,
    [1, 0, 1] : 1,
    [1, 1, 0] : 1,
    [1, 1, 1] : 1
}

But when I run this it gives me the error:

TypeError: unhashable type: 'list'

How can I store lists in a dictionary? I have the feeling that a list cannot be a key, but I want something like this, not a variable for each of the lists.

Answer 1

Keys in a dictionary have to be immutable. Lists are mutable, so they can't be keys. You can change them into tuples.

Answer 2

You need at least tuples instead of list, so:

data = {
    (0, 0, 0) : 0,
...
}

Note parenthesis, instead of square brackets. Tuples are like lists, except are immutable and can be used as keys in dictionary without a hassle.

Answer 3

You can instead use tuples

data = {
    (0, 0, 0) : 0,
    (0, 0, 1) : 0,
    (0, 1, 0) : 0,
    (0, 1, 1) : 0,
    (1, 0, 0) : 1,
    (1, 0, 1) : 1,
    (1, 1, 0) : 1,
    (1, 1, 1) : 1
}