我有一个包含数千个项目的过时字典，以及数千个项目的更新列表，这些项目存储为包含要在过时字典中更新的功能的字典，尽管更新列表通常较小（但并非总是如此）。
目前，我使用两个for循环来迭代旧字典和更新列表，以将旧字典中的项目与更新列表的正确成员进行匹配，然后覆盖旧字典的相应部分已更新的字典成员（并非所有k，值对都会更新，并且所有对都不会在更新的成员中列出）。
这是我的代码（已修改）：
import copy
json_lyr = {"features": [{"geometry": {"y": 92093.79407307506, "x": 1042519.5130774938},
"attributes": {"WildlifeSi": " ", "EditDate": 1462554757161, "Inlet_Elevation": None,
"COVER_DEPT": 0, "Comments": " ", "UpBankfu_4": 0, "SteepRiffl": " ",
"HeadwallMa": " ", "UpBankfu_3": 0, "UpBankfu_2": 0, "CulvertDro": 0,
"OUTFLOW_BO": " ", "RoadkillWi": " ", "DnLtDomina": " ", "CrossingTy": " ",
"UpBankfull": 0, "UPDATE_COM": " ", "LOCAL_REVI": " ", "RefBankf_4": 0,
"RefBankf_2": 0, "RefBankf_3": 0, "RefBankf_1": 0, "CrossingCo": " ",
"Flow_Condi": " ", "ID": 2209, "DnDepositT": " ", "WildlifeIn": " ",
"Crossing_slope": 0, "DnDimensioB": 0, "PIPE_SPALL": " ", "RoadType": " ",
"Wall_Rise": None, "DnBedrockP": " ", "UpBankArmo": " ", "DnDeposits": " ",
"USER_ID": "JUNK", "Tp_Pipe_Out": None, "Wingwall_Angle": None,
"AvulsionDi": 0, "Editor": "cdowd_NHSADES", "CrossDepth": " ", "UpBankfu_1": 0,
"Geomorph_1": " ", "PoolDepthM": 0, "DnRtDomina": " ", "DnDimensioD": 0,
"DnDimensioC": 0, "INSTALLATI": None, "DnDimensioA": 0, "UpUndermin": " ",
"UpDeposits": " ", "STEEPER_WI": " ", "OUTFALL_TR": " ", "PoolDepthS": 0,
"StructureM": " ", "StructureL": 0, "SED_BUILDU": " ", "OUTLET_H_1": " ",
"JOINT_SEPE": " ", "DnUndermin": " ", "RAILROAD_C": " ", "UpDepositT": " ",
"UpDimensio": 0, "StructureU": " ", "StructureS": " ", "UpEviEroAg": " ",
"Town": " ", "CulvertWat": 0, "FloodPlain": " ", "ASSE_DATE": 1433289600000,
"DnBedMater": " ", "ApproachAn": " ", "PIPE_DEFOR": " ", "Tp_pipe_Inlet": None,
"DnEvidEroA": " ", "UpLtVegeta": " ", "HydCntrlTy": " ", "STORM_DRAI": " ",
"Dn_Side_Ele": None, "UpBeaverDa": " ", "T2_REVIEW": " ", "PoolDepth4": " ",
"DnBeaver_1": 0, "InSubstrat": " ", "SCREENING_": " ", "ChannelAvu": " ",
"DRIVEWAY_C": " ", "INLET_HEAD": " ", "UpRtVegeta": " ", "MARKER_POS": " ",
"HighDownst": " ", "DnBankEros": " ", "AOPCompat": " ", "DistToHydC": 0,
"CulvertSlo": " ", "DnBankArmo": " ", "Observers": " ", "Dn_Hydr_Elev": None,
"POINT_X": 1042519.51307749, "POINT_Y": 92093.7940730751, "Up_Side_Ele": None,
"Road_Elevation": None, "DES_REVIEW": " ", "OUTLET_HEI": " ",
"InDepositT": " ", "OBJECTID": 1, "UpBedMater": " ", "OUTLET_HEA": " ",
"InBedMat_1": " ", "PIPE_CORRO": " ", "UpRtDomina": " ", "SCOUR_OUTL": " ",
"InDeposits": " ", "NoShoulder": 0, "CULVERT_OU": " ",
"Creator": "cdowd_NHSADES", "RefBankful": 0, "SteppedFoo": " ",
"Pool_Btm_Elev": None, "PAINTED_MA": " ", "DnBankFull": 0, "UpBedrockP": " ",
"StreamName": " ", "DnRtVegeta": " ", "Hyd_Cont_Elev": None,
"GlobalID_2": "8bb7eb9e-45b2-4e16-b563-f2a44787342b", "UpBeaver_1": 0,
"Outlet_Elevation": None, "Dn_to_Hydr_Cont": 0, "WildlifeUp": " ",
"ROAD_NAME": " ", "StructureCount": 0, "UpLtDomina": " ", "Downstream": " ",
"CulvertOverflow": " ", "Inlet_Type": None, "INFLOW_BOD": " ", "TIDAL": " ",
"DnBeaverDa": " ", "CrossVelMa": " ", "UpBankEros": " ", "DnLtVegeta": " ",
"UPDATE_OBS": " ", "DnBankFu_4": 0, "InBedMater": " ", "DnBankFu_1": 0,
"DnBankFu_2": 0, "DnBankFu_3": 0, "RECENT_RAI": " ",
"CreationDate": 1462554757161,
"GlobalID": "{e5f9d928-c9c2-4c43-b7de-eeefa7820955}", "NoTravelLa": 0,
"UpDimens_2": 0, "UpDimens_3": 0, "REVIEW_LEV": "Incomplete", "UpDimens_1": 0,
"Jurisdicti": " ", "UPDATE_DAT": None, "EMBEDDED_D": 0, "CULVERT_IN": " ",
"GeomorphCo": " "}},
{"geometry": {"y": 157642.015010491, "x": 1164940.328930911},
"attributes": {"WildlifeSi": " ", "EditDate": 1462554757161, "Inlet_Elevation": None,
"COVER_DEPT": 0.25, "Comments": " ", "UpBankfu_4": 9, "SteepRiffl": "No",
"HeadwallMa": "Concrete", "UpBankfu_3": 6, "UpBankfu_2": 6.5, "CulvertDro": 0,
"OUTFLOW_BO": "Wetland", "RoadkillWi": "Goupher",
"DnLtDomina": "Herbaceous/grass", "CrossingTy": "Box Culvert",
"UpBankfull": 9.5,
"UPDATE_COM": "1) Wetland present. Would argue that geomorphic compatibility determination is inappropriate in this instance. 2) What is the substrate type of material (if exists) in the structure? ",
"LOCAL_REVI": " ", "RefBankf_4": 3, "RefBankf_2": 5, "RefBankf_3": 3.25,
"RefBankf_1": 8, "CrossingCo": "Old", "Flow_Condi": "Typically Low",
"ID": 2210, "DnDepositT": "None", "WildlifeIn": " ", "Crossing_slope": 0,
"DnDimensioB": 4.1, "PIPE_SPALL": "Low", "RoadType": "Paved",
"Wall_Rise": None, "DnBedrockP": "No", "UpBankArmo": "None", "DnDeposits": " ",
"USER_ID": "EKINNorthRd01", "Tp_Pipe_Out": None, "Wingwall_Angle": None,
"AvulsionDi": 40, "Editor": "cdowd_NHSADES", "CrossDepth": "Yes",
"UpBankfu_1": 5.5, "Geomorph_1": " ", "PoolDepthM": 0,
"DnRtDomina": "Shrub/sapling", "DnDimensioD": 0, "DnDimensioC": 0,
"INSTALLATI": 1433808000000, "DnDimensioA": 6, "UpUndermin": "None",
"UpDeposits": " ", "STEEPER_WI": "No", "OUTFALL_TR": "None", "PoolDepthS": 0,
"StructureM": "Concrete", "StructureL": 35, "SED_BUILDU": "Open",
"OUTLET_H_1": "Good", "JOINT_SEPE": "None", "DnUndermin": "None",
"RAILROAD_C": "No", "UpDepositT": "None", "UpDimensio": 6,
"StructureU": "None", "StructureS": "No", "UpEviEroAg": "None",
"Town": "East Kingston", "CulvertWat": 4.5, "FloodPlain": "Not Significant",
"ASSE_DATE": 1433808000000, "DnBedMater": "Cobble",
"ApproachAn": "Naturally Straight", "PIPE_DEFOR": " ", "Tp_pipe_Inlet": None,
"DnEvidEroA": "None", "UpLtVegeta": "Yes", "HydCntrlTy": " ",
"STORM_DRAI": "No", "Dn_Side_Ele": None, "UpBeaverDa": "No", "T2_REVIEW": " ",
"PoolDepth4": " ", "DnBeaver_1": 0, "InSubstrat": "NA", "SCREENING_": "No",
"ChannelAvu": "Cross & Follow Road", "DRIVEWAY_C": "No", "INLET_HEAD": "Good",
"UpRtVegeta": "Yes", "MARKER_POS": "NA", "HighDownst": "No",
"DnBankEros": "None", "AOPCompat": " ", "DistToHydC": 0,
"CulvertSlo": "About the Same", "DnBankArmo": "None", "Observers": "RPC_NLCW",
"Dn_Hydr_Elev": None, "POINT_X": 1164965.05788408, "POINT_Y": 157629.355258904,
"Up_Side_Ele": None, "Road_Elevation": None, "DES_REVIEW": " ",
"OUTLET_HEI": "< 1 ft above Channel", "InDepositT": "None", "OBJECTID": 2,
"UpBedMater": "Cobble", "OUTLET_HEA": "Concrete", "InBedMat_1": " ",
"PIPE_CORRO": " ", "UpRtDomina": "Shrub/sapling", "SCOUR_OUTL": "None",
"InDeposits": " ", "NoShoulder": 0, "CULVERT_OU": "At Grade",
"Creator": "cdowd_NHSADES", "RefBankful": 7, "SteppedFoo": "No",
"Pool_Btm_Elev": None, "PAINTED_MA": "NA", "DnBankFull": 7.33,
"UpBedrockP": "No",
"StreamName": "NHRIV600030805-04 GREAT BROOK - BRICKYARD BROOK",
"DnRtVegeta": "Yes", "Hyd_Cont_Elev": None,
"GlobalID_2": "ce43e49c-5386-4127-8db9-793228b03c13", "UpBeaver_1": 0,
"Outlet_Elevation": None, "Dn_to_Hydr_Cont": 0, "WildlifeUp": "Bugs, birds",
"ROAD_NAME": "Rt 108 north rd", "StructureCount": 1,
"UpLtDomina": "Herbaceous/grass", "Downstream": "No", "CulvertOverflow": "No",
"Inlet_Type": None, "INFLOW_BOD": "Wetland", "TIDAL": "No", "DnBeaverDa": "No",
"CrossVelMa": "Yes", "UpBankEros": "None", "DnLtVegeta": "Yes",
"UPDATE_OBS": " ", "DnBankFu_4": 3.5, "InBedMater": "No", "DnBankFu_1": 5.9,
"DnBankFu_2": 7.75, "DnBankFu_3": 5, "RECENT_RAI": "Within 1 week",
"CreationDate": 1462554757161,
"GlobalID": "{89bc7cfd-b115-42ca-aa07-16ce42539c4d}", "NoTravelLa": 2,
"UpDimens_2": 0, "UpDimens_3": 0, "REVIEW_LEV": "Incomplete",
"UpDimens_1": 4.1, "Jurisdicti": "NH DOT", "UPDATE_DAT": None, "EMBEDDED_D": 0,
"CULVERT_IN": "At Grade", "GeomorphCo": " "}}]}
update_list = [{'ID': 2209, 'GeomorphCo': 'Fail'},
{'ID': 2210, 'GlobalID': '{e5f9d928-c9c2-4c43-b7de-eeefa7820955}'}]
updated_features_superlist = []
for feature in json_lyr['features']:
for update_feature in update_list:
# if the IDs match
if feature['attributes']['ID'] == update_feature['ID']:
updated_feature = copy.deepcopy(feature)
for key, value in update_feature.items():
if key == 'ID':
continue # don't need to update this
else:
updated_feature['attributes'][key] = update_feature[key]
# adding to the list of features that are updated
updated_features_superlist.append(updated_feature)
其中json_lyr是我的过时字典，update_list是我更新的功能列表。
在过时字典和字典更新列表中有数千个点，需要几分钟才能完成2个for循环。是否有一种快速方法来构建更新的功能列表？
此外，每次运行脚本时，需要更新的属性（键，值对）都会有很大差异，从1个属性到几十个 - 因此迭代通过存储在update_list中的字典中的键值对。 / p>
修改
过时功能的示例：
{
'geometry': {
'y': 104288.95701865852,
'x': 854862.8250714131
},
'attributes': {
'WildlifeSi': None,
'EditDate': None,
'Inlet_Elevation': 0,
'COVER_DEPT': 1.89999997615814,
'Comments': None,
'UpBankfu_4': None,
'SteepRiffl': None,
'HeadwallMa': 'DryFitStone',
'UpBankfu_3': None,
'UpBankfu_2': None,
'CulvertDro': None,
'OUTFLOW_BO': 'Ditch',
'RoadkillWi': 'None',
'DnLtDomina': None,
'CrossingTy': 'RoundCulvert',
'UpBankfull': None,
'UPDATE_COM': None,
'LOCAL_REVI': None,
'RefBankf_4': None,
'RefBankf_2': None,
'RefBankf_3': None,
'RefBankf_1': None,
'CrossingCo': 'Old',
'Flow_Condi': None,
'SADES_ID': 6574,
'DnDepositT': None,
'WildlifeIn': None,
'Crossing_slope': 1,
'DnDimensioB': 0,
'PIPE_SPALL': 'NotRated',
'RoadType': 'Paved',
'Wall_Rise': 0,
'DnBedrockP': None,
'UpBankArmo': None,
'DnDeposits': None,
'USER_ID': None,
'Tp_Pipe_Out': 0,
'Wingwall_Angle': 'NoneofThese',
'AvulsionDi': None,
'Editor': None,
'CrossDepth': None,
'UpBankfu_1': None,
'Geomorph_1': None,
'PoolDepthM': None,
'DnRtDomina': None,
'DnDimensioD': 0,
'DnDimensioC': 0,
'INSTALLATI': None,
'DnDimensioA': 0.930000007152557,
'UpUndermin': 'None',
'UpDeposits': None,
'STEEPER_WI': None,
'OUTFALL_TR': 'None',
'PoolDepthS': None,
'StructureM': 'Plastic-Smooth',
'StructureL': 29.8299999237061,
'SED_BUILD': '1/4Plugged',
'OUTLET_H_1': 'Fair',
'JOINT_SEPE': 'None',
'DnUndermin': 'None',
'RAILROAD_C': 'No',
'UpDepositT': None,
'UpDimensio': 0.980000019073486,
'Structure': 'None',
'StructureS': 'No',
'UpEviEroAg': None,
'Town': 'Fitzwilliam',
'CulvertWat': None,
'FloodPlain': None,
'ASSE_DATE': 1469033829000L,
'DnBedMater': None,
'ApproachAn': None,
'PIPE_DEFOR': 'None',
'Tp_pipe_Inlet': 0,
'DnEvidEroA': None,
'UpLtVegeta': None,
'HydCntrlTy': None,
'STORM_DRAI': 'Yes',
'Dn_Side_Ele': 0,
'UpBeaverDa': 'No',
'T2_REVIEW': None,
'PoolDepth4': None,
'DnBeaver_1': None,
'InSubstrat': None,
'SCREENING_': 'No',
'ChannelAv': None,
'DRIVEWAY_C': 'No',
'INLET_HEAD': 'Fair',
'UpRtVegeta': None,
'MARKER_POS': 'NA',
'HighDownst': None,
'DnBankEros': None,
'AOPCompat': '',
'DistToHydC': None,
'CulvertSlo': None,
'DnBankArmo': None,
'Observers': 'SWRPCMCHG',
'Dn_Hydr_Elev': None,
'POINT_X': None,
'POINT_Y': None,
'Up_Side_Ele': 0,
'Road_Elevation': 0,
'DES_REVIEW': None,
'OUTLET_HEI': 'AtGrade',
'InDepositT': None,
'OBJECTID': 6994,
'UpBedMater': None,
'OUTLET_HEA': 'DryFitStone',
'InBedMat_1': None,
'PIPE_CORRO': 'NotRated',
'UpRtDomina': None,
'SCOUR_OUTL': 'None',
'InDeposits': None,
'NoShoulder': 0,
'CULVERT_O': None,
'Creator': None,
'RefBankful': None,
'SteppedFoo': None,
'Pool_Btm_Elev': None,
'PAINTED_MA': 'NA',
'DnBankFull': None,
'UpBedrockP': None,
'StreamName': 'NA',
'DnRtVegeta': None,
'Hyd_Cont_Elev': None,
'GlobalID_2': '0544fd95-aee7-4874-9e03-fb8800b51da4',
'UpBeaver_1': None,
'Outlet_Elevation': None,
'Dn_to_Hydr_Cont': None,
'WildlifeUp': None,
'ROAD_NAME': 'RobbinsRoad',
'StructureCount': 1,
'UpLtDomina': None,
'Downstream': None,
'CulvertOverflow': 'No',
'Inlet_Type': 'NoneofThese',
'INFLOW_BOD': 'Ditch',
'TIDAL': 'No',
'DnBeaverDa': None,
'CrossVelMa': None,
'UpBankEros': None,
'DnLtVegeta': None,
'UPDATE_OBS': None,
'DnBankFu_4': None,
'InBedMater': None,
'DnBankFu_1': None,
'DnBankFu_2': None,
'DnBankFu_3': None,
'RECENT_RAI': 'Within1week',
'CreationDate': None,
'GlobalID': None,
'NoTravelLa': 2,
'UpDimens_2': 0,
'UpDimens_3': 0,
'REVIEW_LEV': 'QAisN/A',
'UpDimens_1': 0,
'Jurisdicti': 'Municipal',
'UPDATE_DAT': None,
'EMBEDDED_D': 0,
'CULVERT_IN': None,
'GeomorphCo': ''
}
}
功能的更新列表示例 - 在这种情况下，只需要更新一个属性：
{'SADES_ID': 6574, 'GeomorphCo': 'Fail'}
答案 0 :(得分：2)
首先，我要创建一个字典映射ID到update_list中的项目：
update_mapping = dict((update_feature['ID'], update_feature)
for update_feature in update_list)
然后运行你的循环，但使用字典查找而不是for循环来获取update_feature：
for feature in json_lyr['layers'][0]['features']:
if feature['attributes']['ID'] in update_mapping:
update_feature = update_mapping[feature['attributes']['ID']]
updated_feature = copy.deepcopy(feature)
for key, value in update_feature.items():
if key == 'ID': continue # don't need to update this
else:
updated_feature['attributes'][key] = update_feature[key]
# adding to the list of features that are updated
updated_features_superlist.append(updated_feature)