I like the spirit, however a lot of these can be done with a simple one liner... Example for chunked iteration:

```

def chunk_iter(some_seq, n):

    return (seq[pos:pos + n] for pos in range(0, len(seq), n))

```

example for multi-dict: (unless I'm missing something)

```

from collections import defaultdict

d = defaultdict(list)

d['a'].append('b')

d['a'].append('c')

dict(d)

{'a': ['b', 'c']}

```