我正在尝试从此 JSON 文件（可能格式不正确）中提取特定列。
这是一个数据示例：
{ "_id" : { "$oid" : "4ddb1e4a9a0881572c000008" }, "aggregates" : { "_id" : { "$oid" : "4e0cc19ccd62f55ff9000006" }, "comments" : 0, "followers" : 1610, "following" : 92, "likes" : 8, "mig" : 1, "ntf" : 294, "posts" : 1, "yaf" : 1 }, "created_at" : { "$date" : 1306205770619 }, "devices" : [ "ios2:b54e0199cbcf73ba602bd11365b8bd3a7024796b", "ios2:7511337bea3c2378533fedceb156fae0a4a12bfe" ], "email" : "abc@example.edu", "email_verified" : true, "fb_info" : { "ext_user_id" : "123", "ext_access_token" : "tok_id", "ext_token_expr" : { "$date" : …