python - 合并字典项值的重复列表

Question

我有以下具有重复值的字典列表(教练)。

d = [
    {"players": [{"id": 179, "name": "Santosh"}], "coach": "Xavi Alonso"}, 
    {"players": [{"id": 180, "name": "Hari"}], "coach": "Xavi Alonso"}, 
    {"players": [{"id": 175, "name": "Hitman"}], "coach": "Anna Puyol"}
]

我想根据教练姓名合并重复项目。我怎样才能做到这一点？

def exportplayers(request):
    d = [
        {"players": [{"id": 179, "name": "Santosh"}, {"id": 180, "name": "Hari"}], "coach": "Xavi Alonso"}, 
        {"players": [{"id": 175, "name": "Hitman"}], "coach": "Anna Puyol"}
    ]


    return HttpResponse(json.dumps(d))

Answer 1

一个可能的解决方案是构建一个辅助字典，以coach 为键，players 列表为值

d = [
    {"players": [{"id": 179, "name": "Santosh"}], "coach": "Xavi Alonso"},
    {"players": [{"id": 180, "name": "Hari"}], "coach": "Xavi Alonso"},
    {"players": [{"id": 175, "name": "Hitman"}], "coach": "Anna Puyol"}
]
aux = collections.defaultdict(list)
for e in d:
    aux[e['coach']].append(e['players'][0])

aux 现在是:

>>> aux
defaultdict(<type 'list'>, {'Xavi Alonso': [[{'id': 179, 'name': 'Santosh'}], [{'id': 180, 'name': 'Hari'}]], 'Anna Puyol': [[{'id': 175, 'name': 'Hitman'}]]})

然后你可以用列表推导来构建你的返回值

[{'players':v, 'coach':k} for k,v in aux.items()]

这是

[{'players': [{'id': 179, 'name': 'Santosh'}, {'id': 180, 'name': 'Hari'}], 'coach': 'Xavi Alonso'}, {'players': [{'id': 175, 'name': 'Hitman'}], 'coach': 'Anna Puyol'}]