我有一个页面ID的字典，映射到支持者ID。我将它们分成名为avatars和non_avatars的列表，因为我希望它们按照具有化身的对象和没有化身的对象进行排序，并且我也想按['user']['supported_date']对其进行排序。
这是我的原始数据字典:
pages = {
274: {
1307: {
'support': 1,
'profile_id': 1307,
'id': 16,
'user': {
'first_name': 'robot10',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-11-18 19:56:35.961452+00:00',
'id': 1307,
},
},
1298: {
'support': 1,
'profile_id': 1298,
'id': 19,
'user': {
'first_name': 'robot1',
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'supported_date': '2014-12-12 22:28:35.262345+00:00',
'id': 1298,
},
},
1299: {
'support': 1,
'profile_id': 1299,
'id': 24,
'user': {
'first_name': 'robot2',
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'supported_date': '2014-12-12 22:28:54.382168+00:00',
'id': 1299,
},
},
1300: {
'support': 1,
'profile_id': 1300,
'id': 29,
'user': {
'first_name': 'robot3',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-12-12 22:30:53.800588+00:00',
'id': 1300,
},
},
1302: {
'support': 1,
'profile_id': 1302,
'id': 35,
'user': {
'first_name': 'robot5',
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'supported_date': '2014-12-12 22:31:14.376383+00:00',
'id': 1302,
},
},
},
347: {1298: {
'support': 1,
'profile_id': 1298,
'id': 23,
'user': {
'first_name': 'robot1',
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'supported_date': '2014-12-12 22:28:38.751230+00:00',
'id': 1298,
},
}, 1299: {
'support': 1,
'profile_id': 1299,
'id': 28,
'user': {
'first_name': 'robot2',
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'supported_date': '2014-12-12 22:30:04.421848+00:00',
'id': 1299,
},
}, 1300: {
'support': 1,
'profile_id': 1300,
'id': 33,
'user': {
'first_name': 'robot3',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-12-12 22:30:55.968285+00:00',
'id': 1300,
},
}},
348: {
1298: {
'support': 1,
'profile_id': 1298,
'id': 20,
'user': {
'first_name': 'robot1',
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'supported_date': '2014-12-12 22:28:35.855000+00:00',
'id': 1298,
},
},
1299: {
'support': 1,
'profile_id': 1299,
'id': 25,
'user': {
'first_name': 'robot2',
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'supported_date': '2014-12-12 22:28:56.569903+00:00',
'id': 1299,
},
},
1300: {
'support': 1,
'profile_id': 1300,
'id': 30,
'user': {
'first_name': 'robot3',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-12-12 22:30:54.204695+00:00',
'id': 1300,
},
},
1302: {
'support': 1,
'profile_id': 1302,
'id': 36,
'user': {
'first_name': 'robot5',
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'supported_date': '2014-12-12 22:31:19.885209+00:00',
'id': 1302,
},
},
},
278: {
1298: {
'support': 1,
'profile_id': 1298,
'id': 21,
'user': {
'first_name': 'robot1',
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'supported_date': '2014-12-12 22:28:36.780765+00:00',
'id': 1298,
},
},
1299: {
'support': 1,
'profile_id': 1299,
'id': 26,
'user': {
'first_name': 'robot2',
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'supported_date': '2014-12-12 22:28:57.598403+00:00',
'id': 1299,
},
},
1300: {
'support': 1,
'profile_id': 1300,
'id': 31,
'user': {
'first_name': 'robot3',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-12-12 22:30:54.979874+00:00',
'id': 1300,
},
},
1302: {
'support': 1,
'profile_id': 1302,
'id': 34,
'user': {
'first_name': 'robot5',
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'supported_date': '2014-12-12 22:31:12.505020+00:00',
'id': 1302,
},
},
},
279: {1298: {
'support': 1,
'profile_id': 1298,
'id': 22,
'user': {
'first_name': 'robot1',
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'supported_date': '2014-12-12 22:28:37.330745+00:00',
'id': 1298,
},
}, 1299: {
'support': 1,
'profile_id': 1299,
'id': 27,
'user': {
'first_name': 'robot2',
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'supported_date': '2014-12-12 22:28:58.149790+00:00',
'id': 1299,
},
}, 1300: {
'support': 1,
'profile_id': 1300,
'id': 32,
'user': {
'first_name': 'robot3',
'photo': '/static/images/avatars/avatar-male-100.png',
'supported_date': '2014-12-12 22:30:55.475817+00:00',
'id': 1300,
},
}},
}
然后，我遍历页面dict，抽出支持者并使用化身，并将其放入自己的列表中。我还将那些没有化身的人物放入自己的列表中。
avatars = []
non_avatars = []
for pid, page_supporters in pages.items():
for supporter_id, page_supporter in page_supporters.items():
page_supporter['page_id'] = pid
if 'user_photos' in page_supporter['user']['photo']:
avatars.append(page_supporter)
else:
non_avatars.append(page_supporter)
现在，我按用户支持的日期对它们进行排序。
# Sort all avatars by user supported date
avatars = sorted(avatars, key=lambda supporter: supporter['user']['supported_date'], reverse=True)
# Do the same for the non avatars
non_avatars = sorted(non_avatars, key=lambda supporter: supporter['user']['supported_date'], reverse=True)
最后，将它们组合成一个列表。
# These are now supported by those who have avatars first and their supported date DESC
combined_supporters = avatars + non_avatars
从这里，我需要重新创建原始词典。我尝试做update，但是它一直覆盖以前的值。我认为我需要使用setdefault，但我不确定。
如何将我的combined_supporters列表恢复为与pages字典相同的结构？
python大神给出的解决方案
如果需要保持顺序，则必须用collections.OrderedDict() instances替换页面词典；这些音轨插入顺序，然后所有迭代重复该顺序:
from collections import OrderedDict
# replace existing pages dict with a new one maintaining ordering
pages = {page_id: OrderedDict() for page_id in pages}
for supporter in combined_supporters:
page_id = supporter.pop('page_id')
pages[page_id][supporter['profile_id']] = supporter
根据您的设置，将产生:
>>> from collections import OrderedDict
>>> pages = {page_id: OrderedDict() for page_id in pages}
>>> for supporter in combined_supporters:
... page_id = supporter.pop('page_id')
... pages[page_id][supporter['profile_id']] = supporter
...
>>> from pprint import pprint
>>> pprint(pages)
{274: OrderedDict([(1302, {'support': 1, 'profile_id': 1302, 'id': 35, 'user': {'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png', 'first_name': 'robot5', 'supported_date': '2014-12-12 22:31:14.376383+00:00', 'id': 1302}}), (1299, {'support': 1, 'profile_id': 1299, 'id': 24, 'user': {'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png', 'first_name': 'robot2', 'supported_date': '2014-12-12 22:28:54.382168+00:00', 'id': 1299}}), (1298, {'support': 1, 'profile_id': 1298, 'id': 19, 'user': {'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png', 'first_name': 'robot1', 'supported_date': '2014-12-12 22:28:35.262345+00:00', 'id': 1298}}), (1300, {'support': 1, 'profile_id': 1300, 'id': 29, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot3', 'supported_date': '2014-12-12 22:30:53.800588+00:00', 'id': 1300}}), (1307, {'support': 1, 'profile_id': 1307, 'id': 16, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot10', 'supported_date': '2014-11-18 19:56:35.961452+00:00', 'id': 1307}})]),
278: OrderedDict([(1302, {'support': 1, 'profile_id': 1302, 'id': 34, 'user': {'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png', 'first_name': 'robot5', 'supported_date': '2014-12-12 22:31:12.505020+00:00', 'id': 1302}}), (1299, {'support': 1, 'profile_id': 1299, 'id': 26, 'user': {'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png', 'first_name': 'robot2', 'supported_date': '2014-12-12 22:28:57.598403+00:00', 'id': 1299}}), (1298, {'support': 1, 'profile_id': 1298, 'id': 21, 'user': {'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png', 'first_name': 'robot1', 'supported_date': '2014-12-12 22:28:36.780765+00:00', 'id': 1298}}), (1300, {'support': 1, 'profile_id': 1300, 'id': 31, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot3', 'supported_date': '2014-12-12 22:30:54.979874+00:00', 'id': 1300}})]),
279: OrderedDict([(1299, {'support': 1, 'profile_id': 1299, 'id': 27, 'user': {'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png', 'first_name': 'robot2', 'supported_date': '2014-12-12 22:28:58.149790+00:00', 'id': 1299}}), (1298, {'support': 1, 'profile_id': 1298, 'id': 22, 'user': {'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png', 'first_name': 'robot1', 'supported_date': '2014-12-12 22:28:37.330745+00:00', 'id': 1298}}), (1300, {'support': 1, 'profile_id': 1300, 'id': 32, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot3', 'supported_date': '2014-12-12 22:30:55.475817+00:00', 'id': 1300}})]),
347: OrderedDict([(1299, {'support': 1, 'profile_id': 1299, 'id': 28, 'user': {'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png', 'first_name': 'robot2', 'supported_date': '2014-12-12 22:30:04.421848+00:00', 'id': 1299}}), (1298, {'support': 1, 'profile_id': 1298, 'id': 23, 'user': {'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png', 'first_name': 'robot1', 'supported_date': '2014-12-12 22:28:38.751230+00:00', 'id': 1298}}), (1300, {'support': 1, 'profile_id': 1300, 'id': 33, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot3', 'supported_date': '2014-12-12 22:30:55.968285+00:00', 'id': 1300}})]),
348: OrderedDict([(1302, {'support': 1, 'profile_id': 1302, 'id': 36, 'user': {'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png', 'first_name': 'robot5', 'supported_date': '2014-12-12 22:31:19.885209+00:00', 'id': 1302}}), (1299, {'support': 1, 'profile_id': 1299, 'id': 25, 'user': {'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png', 'first_name': 'robot2', 'supported_date': '2014-12-12 22:28:56.569903+00:00', 'id': 1299}}), (1298, {'support': 1, 'profile_id': 1298, 'id': 20, 'user': {'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png', 'first_name': 'robot1', 'supported_date': '2014-12-12 22:28:35.855000+00:00', 'id': 1298}}), (1300, {'support': 1, 'profile_id': 1300, 'id': 30, 'user': {'photo': '/static/images/avatars/avatar-male-100.png', 'first_name': 'robot3', 'supported_date': '2014-12-12 22:30:54.204695+00:00', 'id': 1300}})])}
重新格式化输出:
pages = {
274: OrderedDict([
(
1302, {
'support': 1,
'profile_id': 1302,
'id': 35,
'user': {
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'first_name': 'robot5',
'supported_date': '2014-12-12 22:31:14.376383+00:00',
'id': 1302
}
}
),
(
1299, {
'support': 1,
'profile_id': 1299,
'id': 24,
'user': {
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'first_name': 'robot2',
'supported_date': '2014-12-12 22:28:54.382168+00:00',
'id': 1299
}
}
),
(
1298, {
'support': 1,
'profile_id': 1298,
'id': 19,
'user': {
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'first_name': 'robot1',
'supported_date': '2014-12-12 22:28:35.262345+00:00',
'id': 1298
}
}
),
(
1300, {
'support': 1,
'profile_id': 1300,
'id': 29,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot3',
'supported_date': '2014-12-12 22:30:53.800588+00:00',
'id': 1300
}
}
),
(
1307, {
'support': 1,
'profile_id': 1307,
'id': 16,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot10',
'supported_date': '2014-11-18 19:56:35.961452+00:00',
'id': 1307
}
}
)
]),
278: OrderedDict([
(
1302, {
'support': 1,
'profile_id': 1302,
'id': 34,
'user': {
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'first_name': 'robot5',
'supported_date': '2014-12-12 22:31:12.505020+00:00',
'id': 1302
}
}
),
(
1299, {
'support': 1,
'profile_id': 1299,
'id': 26,
'user': {
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'first_name': 'robot2',
'supported_date': '2014-12-12 22:28:57.598403+00:00',
'id': 1299
}
}
),
(
1298, {
'support': 1,
'profile_id': 1298,
'id': 21,
'user': {
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'first_name': 'robot1',
'supported_date': '2014-12-12 22:28:36.780765+00:00',
'id': 1298
}
}
),
(
1300, {
'support': 1,
'profile_id': 1300,
'id': 31,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot3',
'supported_date': '2014-12-12 22:30:54.979874+00:00',
'id': 1300
}
}
)
]),
279: OrderedDict([
(
1299, {
'support': 1,
'profile_id': 1299,
'id': 27,
'user': {
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'first_name': 'robot2',
'supported_date': '2014-12-12 22:28:58.149790+00:00',
'id': 1299
}
}
),
(
1298, {
'support': 1,
'profile_id': 1298,
'id': 22,
'user': {
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'first_name': 'robot1',
'supported_date': '2014-12-12 22:28:37.330745+00:00',
'id': 1298
}
}
),
(
1300, {
'support': 1,
'profile_id': 1300,
'id': 32,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot3',
'supported_date': '2014-12-12 22:30:55.475817+00:00',
'id': 1300
}
}
)
]),
347: OrderedDict([
(
1299, {
'support': 1,
'profile_id': 1299,
'id': 28,
'user': {
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'first_name': 'robot2',
'supported_date': '2014-12-12 22:30:04.421848+00:00',
'id': 1299
}
}
),
(
1298, {
'support': 1,
'profile_id': 1298,
'id': 23,
'user': {
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'first_name': 'robot1',
'supported_date': '2014-12-12 22:28:38.751230+00:00',
'id': 1298
}
}
),
(
1300, {
'support': 1,
'profile_id': 1300,
'id': 33,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot3',
'supported_date': '2014-12-12 22:30:55.968285+00:00',
'id': 1300
}
}
)
]),
348: OrderedDict([
(
1302, {
'support': 1,
'profile_id': 1302,
'id': 36,
'user': {
'photo': '/user_photos/24/35/24351b2c4cf99723c7a04b9bbf5706cb.png',
'first_name': 'robot5',
'supported_date': '2014-12-12 22:31:19.885209+00:00',
'id': 1302
}
}
),
(
1299, {
'support': 1,
'profile_id': 1299,
'id': 25,
'user': {
'photo': '/user_photos/da/ea/daea1c07bc50568fab0462327b66c251.png',
'first_name': 'robot2',
'supported_date': '2014-12-12 22:28:56.569903+00:00',
'id': 1299
}
}
),
(
1298, {
'support': 1,
'profile_id': 1298,
'id': 20,
'user': {
'photo': '/user_photos/01/f2/01f236a6a15fee6153f834010deafffa.png',
'first_name': 'robot1',
'supported_date': '2014-12-12 22:28:35.855000+00:00',
'id': 1298
}
}
),
(
1300, {
'support': 1,
'profile_id': 1300,
'id': 30,
'user': {
'photo': '/static/images/avatars/avatar-male-100.png',
'first_name': 'robot3',
'supported_date': '2014-12-12 22:30:54.204695+00:00',
'id': 1300
}
}
)
])
}