python - 像这样在 python 中合并两个字典

Question

我想像这样合并两个字典:

来自:

  a1 = {u'2016-03-11': [u'20:00', u'22:10']}
  a2 = {u'2016-03-11': [u'20:00', u'23:10'],u'2016-03-12': [u'20:00', u'22:10']}

到:

  an = {u'2016-03-11': [u'20:00',u'22:10', u'23:10'],u'2016-03-12': [u'20:00', u'22:10']}

我需要一个合并两个字典的函数

Answer 1

from collections import defaultdict


a1 = {u'2016-03-11': [u'20:00', u'22:10']}
a2 = {u'2016-03-11': [u'20:00', u'23:10'],u'2016-03-12': [u'20:00', u'22:10']}    

dd = defaultdict(set)
for d in a1, a2:
    for k, v in d.items():
        dd[k] |= set(v)
res = {k: sorted(v) for k, v in dd.items()}

print(res)
# {'2016-03-12': ['20:00', '22:10'], '2016-03-11': ['20:00', '22:10', '23:10']}