isliceで辞書を分割する実装

dict_slice.py

data = { i:i**2 for i in range(10) }
pprint.pprint(data, width=40, indent=4)
# {
#     0: 0,
#     1: 1,
#     2: 4,
#     3: 9,
#     4: 16,
#     5: 25,
#     6: 36,
#     7: 49,
#     8: 64,
#     9: 81
# }

from pprint import pprint
from itertools import islice

def dict_chunks(data, size):
    it = iter(data)
    for i in range(0, len(data), size):
        yield {k:data[k] for k in islice(it, size)}

chunks = dict_chunks(data, size=3)
count = 0
for c in chunks:
    print(f"chunk {count}: {c.keys()}")
    count += 1
# chunk 0: dict_keys([0, 1, 2])
# chunk 1: dict_keys([3, 4, 5])
# chunk 2: dict_keys([6, 7, 8])
# chunk 3: dict_keys([9])

より突っ込んだことを書くと長くなるので記事にまとめています。