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我正在努力解决与django自定义管理命令相关的问题。这是用于从json文件加载数据的自定义管理命令代码：

import time
import json
import sys
from cycu.models import hfModel
from django.db import IntegrityError
from django.core.management import BaseCommand
from django.utils.text import slugify
from django.contrib.gis.geos import Point


class Command(BaseCommand):
    stdin = sys.stdin

    def handle(self, *args, **options):
        start_time = time.time()
        self.stdout.write("Loading Facilities...")
        data = json.load(self.stdin)

        if data:
            hfModel.objects.all().delete()
        instances = []

        for d in data["features"]:
            try:
                if d["properties"]["statename"] == 'Kano':
                    a = hfModel(
                        id=int(d["properties"]["id"]),
                        wardname=d["properties"]["wardname"],
                        wardcode=d["properties"]["wardcode"],
                        lganame=d["properties"]["lganame"],
                        lgacode=int(d["properties"]["lgacode"]),
                        zonename=d["properties"]["zone"],
                        statename=d["properties"]["statename"],
                        source=d["properties"]["source"],
                        ownership=d["properties"]["ownership"],
                        category=d["properties"]["category"],
                        primary_name=d["properties"]["primary_name"],
                        hthfa_code=d["properties"]["hthfa_code"],
                        hthfa_code_slug=slugify(d["properties"]["hthfa_code"]),
                        masterlist_type=d["properties"]["masterlist_type"],
                        point=Point(d["geometry"]["coordinates"])
                    )
                    instances.append(a)
            except …