여러 dict 병합하기

from itertools import chain

from collections import defaultdict

dict1 = {'bookA': 1, 'bookB': 2, 'bookC': 3}

dict2 = {'bookC': 2, 'bookD': 4, 'bookE': 5}

dict3 = defaultdict(list)

for k, v in chain(dict1.items(), dict2.items()):

    dict3[k].append(v)

 

for k, v in dict3.items():

    print(k, v)