根据值组合字典

Question

我有一个看起来像这样的字典列表[{"Name": John, "Score": 1}, {"Name": John, "Score": 2}, {"Name": Steve, "Score": 3}, {"Name": Steve, "Score": 4}]我怎样才能像这样组合这些字典呢？[{"Name": John, "Score": [1,2]},{"Name": Steve, "Score": [3,4]}]

Answer 1

lst = [{"Name": "John", "Score": 1}, {"Name": "John", "Score": 2}, {"Name": "Steve", "Score": 3}, {"Name": "Steve", "Score": 4}]

out = {}

for d in lst:

    out.setdefault(d['Name'], []).append(d['Score'])

out = [{'Name': k, 'Score': v} for k, v in out.items()]

print(out)

印刷：

[{'Name': 'John', 'Score': [1, 2]}, {'Name': 'Steve', 'Score': [3, 4]}]

Answer 2

使用itertools

def combine(group):

    out = {}

    out['Name'] = group[0]['Name']

    score = []

    for sub in group:

        score.append(sub['Score'])

    out['Score'] = score

    return out

grouped = map(combine,[list(v) for k,v in groupby(x, lambda x: x['Name'])])

print(list(grouped))

[{'Name': 'John', 'Score': [1, 2]}, {'Name': 'Steve', 'Score': [3, 4]}]