Question

I need to make a dictionary where you can reference [[1,2],[3,4]] –> ([1,2]:0, [2,3]:0)
I’ve tried different ways but I can’t use a list in a dictionary. So i tried using tuples, but its still the same. Any help is appreciated!

Answer 1

You need to use tuples:

dict.fromkeys((tuple(i) for i in [[1,2],[3,4]]), 0)

or (for python2.7+)

{tuple(i): 0 for i in [[1,2], [3,4]]}

Edit:

Reading the comments, OP probably want to count occurrences of a list:

>>> collections.Counter(tuple(i) for i in [[1,2], [1,2], [3,4]])
Counter({(1, 2): 2, (3, 4): 1})