[PYTHON] Extrahieren Sie bestimmte Daten aus komplexem JSON

Einführung

Ursprünglich ist es ein JSON zum einfachen Ausdrücken einer komplizierten Datenstruktur, aber es kann aufgrund eines falschen Designs oder unentschlossener Spezifikationen kompliziert werden. Die Komplexität besteht darin, dass Sie nicht sicher sind, welche Datenebene Sie von JSON erhalten möchten und wie viele.

Der Zweck dieser Zeit ist es, bestimmte Daten von einem so komplizierten JSON zu erfassen.

Dieses Ziel

input

test.json


{"a": [{
  "b": 1, 
  "c": [{
    "star": [{"Deneb": "Deneb", "Altair": "Altair", "Vega": "Vega"}], 
    "d": [2,3]
    }], 
  "e": {"g": "x"}
  }],
 "f": "y",
}

output

[{"Deneb": "Deneb", "Altair": "Altair", "Vega": "Vega"}]

Die Daten, die Sie erhalten möchten, sind

→ JSON rekursiv durchsuchen

Implementierung

python


import json

def search(arg, cond):
    res =[]
    if cond(arg):
        res.append(arg)
    if isinstance(arg, list):
        for item in arg:
            res += search(item, cond)
    elif isinstance(arg, dict):
        for value in arg.values():
            res += search(value, cond)
    return res

def has_star_key(arg):
    if isinstance(arg, dict):
        return arg.keys() == {"Deneb", "Altair", "Vega"}
            
def get_star(arg):
    return search(arg, has_star_key)


if __name__ == "__main__":
    with open('test.json', encoding='utf-8') as f:
        data = json.load(f)
        print(get_star(data)) # [{"Deneb": "Deneb", "Altair": "Altair", "Vega": "Vega"}]

Ich konnte die gewünschten Daten erhalten!

Kommentar

① ** Funktion zum Durchsuchen von JSON **

python


def search(arg, cond):
    res =[]
    if cond(arg):
        res.append(arg)
    if isinstance(arg, list):
        for item in arg:
            res += search(item, cond)
    elif isinstance(arg, dict):
        for value in arg.values():
            res += search(value, cond)
    return res

Erstes Argument: Str-Typ oder Int-Typ oder List-Typ oder Dict-Typ Zweites Argument: Funktion, die bestimmt, ob die Daten erfasst werden sollen (Funktion (2)) Rückgabewert: Listentyp

② ** Funktion zur Beurteilung von Daten ** Wenn Sie Daten abrufen möchten, wird True zurückgegeben, andernfalls False.

python


def has_star_key(arg):
    if isinstance(arg, dict):
        return arg.keys() == {"Deneb", "Altair", "Vega"}

Erstes Argument: Str-Typ oder Int-Typ oder List-Typ oder Dict-Typ Rückgabewert: Bool-Typ

③ ** Funktion zum Abrufen von Daten **

python


def get_star(arg):
    return search(arg, has_star_key)

Erstes Argument: Diktattyp Rückgabewert: Listentyp

Prüfung

Lassen Sie uns prüfen, ob die Bedingungen geändert wurden oder ob andere JSON-Daten erfasst werden können. Sie kann einfach ausgeführt werden, indem Sie die Beurteilungsbedingungen der Daten ändern, die Sie erfassen möchten. (Funktionsänderung von ② und damit einhergehende Funktionsänderung von ③)

** Fall1. Alle Str-Typ-Daten abrufen ** input

python


{"a": [{
  "b": 1, 
  "c": [{
    "star": [{"Deneb": "Deneb", "Altair": "Altair", "Vega": "Vega"}], 
    "d": [2,3]
    }], 
  "e": {"g": "x"}
  }],
 "f": "y",
}

condition

python


def has_str(s):
    return isinstance(s, str)

output

python


["Deneb", "Vega", "Altair", "x", "y"]

Egal wie viele Daten ich haben wollte, sie haben sie richtig bekommen.

** Fall 2. Erhalten Sie spezifische Daten von JSON mit großen Datenmengen ** input

python


{"DBEngineVersions":[{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.1.73a","DBParameterGroupFamily":"mysql5.1","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.1.73a"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.1.73b","DBParameterGroupFamily":"mysql5.1","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.1.73b"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.5.40","DBParameterGroupFamily":"mysql5.5","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.5.40"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.5.40a","DBParameterGroupFamily":"mysql5.5","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.5.40a"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.5.40b","DBParameterGroupFamily":"mysql5.5","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.5.40b"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.5.41","DBParameterGroupFamily":"mysql5.5","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.5.41"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.6.19a","DBParameterGroupFamily":"mysql5.6","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.6.19a"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.6.19b","DBParameterGroupFamily":"mysql5.6","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.6.19b"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.6.21","DBParameterGroupFamily":"mysql5.6","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.6.21"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.6.21b","DBParameterGroupFamily":"mysql5.6","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.6.21b"},{"Engine":"mysql","DBEngineVersionDescription":"MySQL 5.6.22","DBParameterGroupFamily":"mysql5.6","DBEngineDescription":"MySQL Community Edition","EngineVersion":"5.6.22"},
{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.2.v3","DBEngineVersionDescription":"Oracle 11.2.0.2.v3"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.2.v4","DBEngineVersionDescription":"Oracle 11.2.0.2.v4"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.2.v5","DBEngineVersionDescription":"Oracle 11.2.0.2.v5"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.2.v6","DBEngineVersionDescription":"Oracle 11.2.0.2.v6"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.2.v7","DBEngineVersionDescription":"Oracle 11.2.0.2.v7"},
{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.3.v1","DBEngineVersionDescription":"Oracle 11.2.0.3.v1"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.3.v2","DBEngineVersionDescription":"Oracle 11.2.0.3.v2"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.4.v1","DBEngineVersionDescription":"Oracle 11.2.0.4.v1"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"11.2.0.4.v3","DBEngineVersionDescription":"Oracle 11.2.0.4.v3"},{"Engine":"oracle-ee","DBParameterGroupFamily":"oracle-ee-12.1","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Enterprise Edition","EngineVersion":"12.1.0.1.v1","DBEngineVersionDescription":"Oracle 12.1.0.1.v1"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.2.v3","DBEngineVersionDescription":"Oracle 11.2.0.2.v3"},
{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.2.v4","DBEngineVersionDescription":"Oracle 11.2.0.2.v4"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.2.v5","DBEngineVersionDescription":"Oracle 11.2.0.2.v5"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.2.v6","DBEngineVersionDescription":"Oracle 11.2.0.2.v6"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.2.v7","DBEngineVersionDescription":"Oracle 11.2.0.2.v7"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.3.v1","DBEngineVersionDescription":"Oracle 11.2.0.3.v1"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.3.v2","DBEngineVersionDescription":"Oracle 11.2.0.3.v2"},
{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.4.v1","DBEngineVersionDescription":"Oracle 11.2.0.4.v1"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"11.2.0.4.v3","DBEngineVersionDescription":"Oracle 11.2.0.4.v3"},{"Engine":"oracle-se","DBParameterGroupFamily":"oracle-se-12.1","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition","EngineVersion":"12.1.0.1.v1","DBEngineVersionDescription":"Oracle 12.1.0.1.v1"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.2.v3","DBEngineVersionDescription":"Oracle 11.2.0.2.v3"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.2.v4","DBEngineVersionDescription":"Oracle 11.2.0.2.v4"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.2.v5","DBEngineVersionDescription":"Oracle 11.2.0.2.v5"},
{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.2.v6","DBEngineVersionDescription":"Oracle 11.2.0.2.v6"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.2.v7","DBEngineVersionDescription":"Oracle 11.2.0.2.v7"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.3.v1","DBEngineVersionDescription":"Oracle 11.2.0.3.v1"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.3.v2","DBEngineVersionDescription":"Oracle 11.2.0.3.v2"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.4.v1","DBEngineVersionDescription":"Oracle 11.2.0.4.v1"},{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-11.2","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"11.2.0.4.v3","DBEngineVersionDescription":"Oracle 11.2.0.4.v3"},
{"Engine":"oracle-se1","DBParameterGroupFamily":"oracle-se1-12.1","DefaultCharacterSet":{"CharacterSetName":"AL32UTF8","CharacterSetDescription":"Unicode 5.0 UTF-8 Universal character set"},"DBEngineDescription":"Oracle Database Standard Edition One","EngineVersion":"12.1.0.1.v1","DBEngineVersionDescription":"Oracle 12.1.0.1.v1"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.3.1-R1","DBParameterGroupFamily":"postgres9.3","DBEngineDescription":"PostgreSQL","EngineVersion":"9.3.1"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.3.2-R1","DBParameterGroupFamily":"postgres9.3","DBEngineDescription":"PostgreSQL","EngineVersion":"9.3.2"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.3.3-R1","DBParameterGroupFamily":"postgres9.3","DBEngineDescription":"PostgreSQL","EngineVersion":"9.3.3"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.3.5-R1","DBParameterGroupFamily":"postgres9.3","DBEngineDescription":"PostgreSQL","EngineVersion":"9.3.5"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.3.6-R1","DBParameterGroupFamily":"postgres9.3","DBEngineDescription":"PostgreSQL","EngineVersion":"9.3.6"},{"Engine":"postgres","DBEngineVersionDescription":"PostgreSQL 9.4.1-R1","DBParameterGroupFamily":"postgres9.4","DBEngineDescription":"PostgreSQL","EngineVersion":"9.4.1"},{"Engine":"sqlserver-ee","DBEngineVersionDescription":"SQL Server 2008 R2 10.50.2789.0.v1","DBParameterGroupFamily":"sqlserver-ee-10.5","DBEngineDescription":"Microsoft SQL Server Enterprise Edition","EngineVersion":"10.50.2789.0.v1"},{"Engine":"sqlserver-ee","DBEngineVersionDescription":"SQL Server 2012 11.00.2100.60.v1","DBParameterGroupFamily":"sqlserver-ee-11.0","DBEngineDescription":"Microsoft SQL Server Enterprise Edition","EngineVersion":"11.00.2100.60.v1"},
{"Engine":"sqlserver-ex","DBEngineVersionDescription":"SQL Server 2008 R2 10.50.2789.0.v1","DBParameterGroupFamily":"sqlserver-ex-10.5","DBEngineDescription":"Microsoft SQL Server Express Edition","EngineVersion":"10.50.2789.0.v1"},{"Engine":"sqlserver-ex","DBEngineVersionDescription":"SQL Server 2012 11.00.2100.60.v1","DBParameterGroupFamily":"sqlserver-ex-11.0","DBEngineDescription":"Microsoft SQL Server Express Edition","EngineVersion":"11.00.2100.60.v1"},{"Engine":"sqlserver-se","DBEngineVersionDescription":"SQL Server 2008 R2 10.50.2789.0.v1","DBParameterGroupFamily":"sqlserver-se-10.5","DBEngineDescription":"Microsoft SQL Server Standard Edition","EngineVersion":"10.50.2789.0.v1"},{"Engine":"sqlserver-se","DBEngineVersionDescription":"SQL Server 2012 11.00.2100.60.v1","DBParameterGroupFamily":"sqlserver-se-11.0","DBEngineDescription":"Microsoft SQL Server Standard Edition","EngineVersion":"11.00.2100.60.v1"},{"Engine":"sqlserver-web","DBEngineVersionDescription":"SQL Server 2008 R2 10.50.2789.0.v1","DBParameterGroupFamily":"sqlserver-web-10.5","DBEngineDescription":"Microsoft SQL Server Web Edition","EngineVersion":"10.50.2789.0.v1"},{"Engine":"sqlserver-web","DBEngineVersionDescription":"SQL Server 2012 11.00.2100.60.v1","DBParameterGroupFamily":"sqlserver-web-11.0","DBEngineDescription":"Microsoft SQL Server Web Edition","EngineVersion":"11.00.2100.60.v1"}]}

condition

python


def judge_mysql51(d):
    if isinstance(d, dict):
        return "mysql5.1" in d.values()

output

python


[{"DBEngineVersionDescription": "MySQL 5.1.73a", "DBEngineDescription": "MySQL Community Edition", "Engine": "mysql", "EngineVersion": "5.1.73a",
 "DBParameterGroupFamily": "mysql5.1"}, 
{"DBEngineVersionDescription": "MySQL 5.1.73b", "DBEngineDescription": "MySQL Community Edition", "Engine": "mysql", "EngineVersion": "5.1.73b",
 "DBParameterGroupFamily": "mysql5.1"}]

Ich konnte bestimmte Daten abrufen, auch wenn die JSON-Daten groß waren.

schließlich

Ich habe einen ausführlicheren Artikel geschrieben, bitte beziehen Sie sich darauf.

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