I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
>>> from collections import defaultdict
>>> s = 'mississippi'
>>> d = defaultdict(int)
>>> for k in s:
... d[k] += 1
...
>>> d.items()
dict_items([('m', 1), ('i', 4), ('s', 4), ('p', 2)])
and
>>> s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
>>> d = defaultdict(list)
>>> for k, v in s:
... d[k].append(v)
...
>>> d.items()
[('blue', [2, 4]), ('red', [1]), ('yellow', [1, 3])]
the parameters int and list are for what?