Python 如何以较少的延迟动态格式化dict嵌套列表
我需要你的专业知识来简化嵌套字典的格式设置。我有输入信号列表,需要根据分钟精度在u_id和时间戳字段上分组,并转换为各自的输出格式。我已经发布了我尝试过的格式。我需要尽可能快地格式化和处理它,因为这涉及到时间复杂性。非常感谢你的帮助 代码片段Python 如何以较少的延迟动态格式化dict嵌套列表,python,list,dictionary,time-complexity,itertools,Python,List,Dictionary,Time Complexity,Itertools,我需要你的专业知识来简化嵌套字典的格式设置。我有输入信号列表,需要根据分钟精度在u_id和时间戳字段上分组,并转换为各自的输出格式。我已经发布了我尝试过的格式。我需要尽可能快地格式化和处理它,因为这涉及到时间复杂性。非常感谢你的帮助 代码片段 final_output = [] sorted_signals = sorted(signals, key=lambda x: (x['u_id'], str(x['start_ts'])[0:8])) data = itertools.groupb
final_output = []
sorted_signals = sorted(signals, key=lambda x: (x['u_id'], str(x['start_ts'])[0:8]))
data = itertools.groupby(sorted_signals, key=lambda x: (x['u_id'], calendar.timegm(time.strptime(datetime.utcfromtimestamp(x['start_ts']).strftime('%Y-%m-%d-%H:%M'),'%Y-%m-%d-%H:%M'))))
def format_signals(v):
result =[]
for i in v:
temp_dict = {}
temp_dict.update({'timestamp_utc': i['start_ts']})
for data in i['sign']:
temp_dict.update({data['name'].split('.')[0]: data['val']})
result.append(temp_dict)
return result
for k, v in data:
output_format = {'ui_id': k[0], 'minute_utc': datetime.fromtimestamp(int(k[1])), 'data': format_signals(v),
'processing_timestamp_utc': datetime.strptime(datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S"),"%Y-%m-%d %H:%M:%S")}
final_output.append(output_format)
print(final_output)
signals = [
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 9},
{'name': 'pwr', 'val': 1415}], 'start_ts': 1598440244,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1416}], 'start_ts': 1598440243,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 287, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1417}], 'start_ts': 1598440344,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed.', 'val': 8.2},
{'name': 'pwr', 'val': 925}], 'start_ts': 1598440345,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT172', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'}
]
[{
'ui_id': 287,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
[{
'ui_id': 287,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
输入
final_output = []
sorted_signals = sorted(signals, key=lambda x: (x['u_id'], str(x['start_ts'])[0:8]))
data = itertools.groupby(sorted_signals, key=lambda x: (x['u_id'], calendar.timegm(time.strptime(datetime.utcfromtimestamp(x['start_ts']).strftime('%Y-%m-%d-%H:%M'),'%Y-%m-%d-%H:%M'))))
def format_signals(v):
result =[]
for i in v:
temp_dict = {}
temp_dict.update({'timestamp_utc': i['start_ts']})
for data in i['sign']:
temp_dict.update({data['name'].split('.')[0]: data['val']})
result.append(temp_dict)
return result
for k, v in data:
output_format = {'ui_id': k[0], 'minute_utc': datetime.fromtimestamp(int(k[1])), 'data': format_signals(v),
'processing_timestamp_utc': datetime.strptime(datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S"),"%Y-%m-%d %H:%M:%S")}
final_output.append(output_format)
print(final_output)
signals = [
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 9},
{'name': 'pwr', 'val': 1415}], 'start_ts': 1598440244,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1416}], 'start_ts': 1598440243,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 287, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1417}], 'start_ts': 1598440344,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed.', 'val': 8.2},
{'name': 'pwr', 'val': 925}], 'start_ts': 1598440345,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT172', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'}
]
[{
'ui_id': 287,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
[{
'ui_id': 287,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
电流输出
final_output = []
sorted_signals = sorted(signals, key=lambda x: (x['u_id'], str(x['start_ts'])[0:8]))
data = itertools.groupby(sorted_signals, key=lambda x: (x['u_id'], calendar.timegm(time.strptime(datetime.utcfromtimestamp(x['start_ts']).strftime('%Y-%m-%d-%H:%M'),'%Y-%m-%d-%H:%M'))))
def format_signals(v):
result =[]
for i in v:
temp_dict = {}
temp_dict.update({'timestamp_utc': i['start_ts']})
for data in i['sign']:
temp_dict.update({data['name'].split('.')[0]: data['val']})
result.append(temp_dict)
return result
for k, v in data:
output_format = {'ui_id': k[0], 'minute_utc': datetime.fromtimestamp(int(k[1])), 'data': format_signals(v),
'processing_timestamp_utc': datetime.strptime(datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S"),"%Y-%m-%d %H:%M:%S")}
final_output.append(output_format)
print(final_output)
signals = [
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 9},
{'name': 'pwr', 'val': 1415}], 'start_ts': 1598440244,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1416}], 'start_ts': 1598440243,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 287, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1417}], 'start_ts': 1598440344,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed.', 'val': 8.2},
{'name': 'pwr', 'val': 925}], 'start_ts': 1598440345,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT172', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'}
]
[{
'ui_id': 287,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
[{
'ui_id': 287,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
所需输出
final_output = []
sorted_signals = sorted(signals, key=lambda x: (x['u_id'], str(x['start_ts'])[0:8]))
data = itertools.groupby(sorted_signals, key=lambda x: (x['u_id'], calendar.timegm(time.strptime(datetime.utcfromtimestamp(x['start_ts']).strftime('%Y-%m-%d-%H:%M'),'%Y-%m-%d-%H:%M'))))
def format_signals(v):
result =[]
for i in v:
temp_dict = {}
temp_dict.update({'timestamp_utc': i['start_ts']})
for data in i['sign']:
temp_dict.update({data['name'].split('.')[0]: data['val']})
result.append(temp_dict)
return result
for k, v in data:
output_format = {'ui_id': k[0], 'minute_utc': datetime.fromtimestamp(int(k[1])), 'data': format_signals(v),
'processing_timestamp_utc': datetime.strptime(datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S"),"%Y-%m-%d %H:%M:%S")}
final_output.append(output_format)
print(final_output)
signals = [
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 9},
{'name': 'pwr', 'val': 1415}], 'start_ts': 1598440244,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1416}], 'start_ts': 1598440243,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 287, 'f_id': 331,
'sign': [{'name': 'speed', 'val': 10},
{'name': 'pwr', 'val': 1417}], 'start_ts': 1598440344,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT123', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'},
{'c_id': '1234', 'u_id': 288, 'f_id': 331,
'sign': [{'name': 'speed.', 'val': 8.2},
{'name': 'pwr', 'val': 925}], 'start_ts': 1598440345,
'crt_ts': 1598440349, 'map_crt_ts': 1598440351, 'ca_id': 'AT172', 'c_n': 'demo',
'msg_cnt': 2, 'window': 'na', 'type': 'na'}
]
[{
'ui_id': 287,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
[{
'ui_id': 287,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440344,
'speed': 10,
'pwr': 1417
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 40),
'data': [{
'timestamp_utc': 1598440244,
'speed': 9,
'pwr': 1415
}, {
'timestamp_utc': 1598440243,
'speed': 10,
'pwr': 1416
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}, {
'ui_id': 288,
'f_id': 311,
'c_id': 1234,
'minute_utc': datetime.datetime(2020, 8, 26, 16, 42),
'data': [{
'timestamp_utc': 1598440345,
'speed': 8.2,
'pwr': 925
}],
'processing_timestamp_utc': datetime.datetime(2020, 8, 29, 19, 35, 46)
}]
也许这可以帮助您以更直接的方式编写代码。如果你只需要遍历信号并将它们组织在一个循环中,也许你不需要更重的排序和分组 当您希望根据u_id收集信号时,字典可以方便地为每个u_id获取一个条目。这可以做到这一点,您只需添加创建基于此有组织的信号记录的输出:
organized = {}
for s in signals:
u_id = s['u_id']
entry = organized.get(u_id, None)
if entry is None:
entry = []
organized[u_id] = entry
entry.append(s)
pprint.pprint(organized)
是可执行的,输出粘贴在下面
因此,让我们定义一个简单的函数,它将从分组所需的每个对象键中提取:
def extract(obj):
return obj['u_id'], obj['f_id'], obj['c_id'], obj['start_ts'] // 60 * 60
注意:为了实现“分钟精度”,我将时间戳除以60以减少秒数,再乘以60以获得有效的时间戳
然后,让我们将对象分组并形成最终列表:
from itertools import groupby
from datetime import datetime
...
final_output = []
for (uid, fid, cid, ts), ss in groupby(sorted(signals, key=extract), extract):
obj = {
'ui_id': uid,
'f_id': fid,
'c_id': int(cid),
'minute_utc': datetime.utcfromtimestamp(ts),
'data': [],
'processing_timestamp_utc': datetime.utcnow()
}
for s in ss:
obj['data'].append({
'timestamp_utc': s['start_ts'],
**{i['name']: i['val'] for i in s['sign']}
})
final_output.append(obj)
要以可读形式打印最终输出
,我们可以使用pprint
:
from pprint import pprint
...
pprint(final_output, sort_dicts=False)
不清楚您如何在所需的输出中对项目进行分组。我在输入中没有看到具有相同
u\u id
和start\u ts
的项目,但您不知何故将具有相同u\u id
的两个项目分组到一个对象中,并将第三个项目放入另一个对象中。@OlvinRoght项目应根据u id和时间戳分钟进行分组。如果您看到,u_id 288的159844024、1598440243属于同一分钟您是否分析了时间花在哪里?我可以试着写一个简单的循环,通过输入并根据id存储信号-可能排序是不必要的,而且需要花费很多时间。@basic,groupby(signals,lambda x:(x['u\u id',x['start\u ts']//60*60))
可以工作。@basic,你没有对你得到的任何答案做出反应,问题解决了吗?他希望信号按'u\u id'
,'f\u id'
,'c\u id'
和'start\u ts'
的时间戳进行分组,精确到分钟。不过他说他只想按u\u id分组。我不理解时间戳的逻辑,但可能会逐步按照u_ID进行分组,然后处理时间戳,dunnoI已经在评论中问过了。@Anton,谢谢你的回复。