Need help in python scripting

[rajrishi990]

Json file: -
{
"id": 1,
"name": "Auto",
"architecture": {
"axe": [
"j",
"y",
"r",
"t",
"x"
],
"p": [
"Vir",
"M"
]
},
"LL": [
{
"id": 10,
"name": "A",
"xx": "D",
"bb": "aa",
"yy": "S"
]
}
}

python script used:-

import sys
import json
import csv
reload(sys)
sys.setdefaultencoding('utf8')
with open('a.json','r') as f:
        json_data=json.load(f,strict=False)
with open('a.csv','w') as outfile:
        csv_write=csv.writer(outfile,quoting=csv.QUOTE_ALL)
        csv_write.writerow(["id","xx"])
        for json_d in json_data["a"]:
                row_array = []
                try:
                        row_array.append(json_d["Id"])
                except KeyError:
                        row_array.append('')
                try:
                        row_array.append(json_d["LL"][0]["xx"])
                except (KeyError,TypeError):
                        row_array.append('')
                except TypeError:
                        row_array.append('')
                csv_write.writerow(row_array)
outfile.close()

i am getting error -IndexError: list index out of range on command -row_array.append(json_d["LL"][0]["xx"])