Python：合并 2 个字典列表

Question

I have this 2 list of dictionaries

a = [{'Month': 'Sep 2021', 'Like': 6}, {'Month': 'Oct 2021', 'Like': 7}]
b = [{'Month': 'Aug 2021', 'View': 20}, {'Month': 'Oct 2021', 'View': 8}]

I want this result

c = [{'Month': 'Aug 2021', 'Like': 0, 'View': 20}, 
     {'Month': 'Sep 2021', 'Like': 6, 'View': 0}, 
     {'Month': 'Oct 2021', 'Like': 7, 'View': 8}]

I tried this one

d = defaultdict(dict)
for l in (a, b):
    for elem in l:
        d[elem['Month']].update(elem)
c = d.values()

but the result is this

dict_values([{'Month': 'Aug 2021', 'View': 20},
             {'Month': 'Sept 2021', 'Like': 6},
             {'Month': 'Oct 2021', 'Like': 7, 'View': 8}])

How can I add 0 if there is no value?

Thanks!

Answer 1

根据评论中的@kaya3，我通过使用得到结果

 d = defaultdict(lambda: {'Like': 0, 'View': 0})