Python: map list to a dict

Question

I need something like

list_dict_dict = {
    [] : {}
}

the problem is [] isnt hashable and cannot be used as a dictionary key

any data structure out there i can used to map a list to a dict?

@Constantinius each item in the list requires info in the dict — ealeon, May 05 '16 at 14:07
This is a duplicate of this question: http://stackoverflow.com/questions/2671211/create-a-dictionary-in-python-which-is-indexed-by-lists — Ken Kinder, May 05 '16 at 14:08

score 8 · Accepted Answer · answered May 05 '16 at 14:06

Convert the list to a tuple

my_dict = {}
my_tuple = tuple(my_list)
my_dict[my_tuple] = my_value

However, afterwards if you make any changes in the list, those will not be reflected in the tuple that you used as the key. List cannot be used as a dict key because it can be mutated, which will change its hash each time an object is added or removed.

Python: map list to a dict

1 Answers1