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我正在尝试做一个合并2个json文件的python脚本，例如：

第一个文件：test.json

[
  {
    "user_id": "273631610",
    "item_id": "0829482",
    "rating": "7"
  },
  {
    "user_id": "40688800",
    "item_id": "1343092",
    "rating": "8"
  },
  {
    "user_id": "395680865",
    "item_id": "1453405",
    "rating": "8"
  }
]

第二个文件：test_userz.json

[
{"contributors": null, "truncated": false, "text": "", "in_reply_to_status_id": null, "id": 421040281296052225, "favorite_count": 0, "source": "<a href=\"http://itunes.apple.com/us/app/imdb-movies-tv/id342792525?mt=8&uo=4\" rel=\"nofollow\">IMDb Movies & TV on iOS</a>", "retweeted": false, "coordinates": null, "entities": {"symbols": [], "user_mentions": [], "hashtags": [{"indices": [23, 28], "text": "IMDb"}], "urls": [{"url": "5E1fLOxB", "indices": [29, 51], "expanded_url": "http://www.imdb.com/title/tt0829482", "display_url": "imdb.com/title/tt0829482"}]}, "in_reply_to_screen_name": null, "id_str": "421040281296052225", …