# not immutable tuple.
v_tuple = (1,2,3,4)

z_list = [1,2,3,4,5]

- Dictionary.

x_dict = {1:'Boston', 2:'NY'}
y_set = {1,2,3,4,5}

keys_list = list(x_dict.keys())
values_list = list(x_dict.values())
items_list = list(x_dict.items())


the reason that word use more than 7 byte for each,
more frequent used word is shorter bit than others for efficiency.