Here???s whathappens if you try:>>> t = [1, 2, 3]>>> d = dict()>>> d[t] = oopsTraceback (most recent call last): File <stdin>, line 1, in ?TypeError: list objects are unhashableI mentioned earlier that a dictionary is implemented using a hashtable and that means that the keyshave to be hashable.A hash is a function that takes a value (of any kind) and returns an integer.