带变量字段的Python JSON到CSV

我有一个非常大的json文件(如1.5gb),我需要将其转换为csv。

问题是,有时会有一个额外的字段,如:

[
    {
        "item": {
            "name": "something",
            "colors": {
                "color_of_something": "something",
                "color_of_something2": "something",
                "color_of_something3": "something"
            },
            "dimensions": {
                "dimensions1": "something",
                "dimensions2": "something",
                "dimensions3": "something"
            },
            "This_field_appears_sometimes": "something",
            "description": {
                "text": "something"
            }
        }
    }]

# -*- coding: utf-8 -*-
import json, csv
with open("items.json") as file:
    data = json.load(file)
    csv_data = csv.writer(open('items.csv','wb+'))
    csv_data.writerow(['item_name','item_color','item_dimension','item_random_field','item_description')
    for json_parsed in data:
        csv_data.writerow([
            json_parsed['item']['name'],
            json_parsed['item']['colors']['color_of_something'],
            json_parsed['item']['dimensions']['dimensions1'],
            json_parsed['item']['This_field_appears_sometimes'],
            json_parsed['item']['description']['text']
        ])

当我运行任务时,出现以下错误:

需要一些提示或建议来解决这个问题,同时我会尝试一下len检查是否对这段代码有效。