如何从json文件中删除类别？

Question

我有一个900万字符的json文件，其中包含信息。有数百件这样的物品（见下文）

"\u2605 Shadow Daggers | Damascus Steel (Well-Worn)":{
   "steam":{
      "last_90d":87.15,
      "last_30d":92.14,
      "last_7d":95.88,
      "last_24h":0
   },
   "bitskins":{
      "price":"80.35",
      "instant_sale_price":"32.14"
   },
   "lootfarm":95.59,
   "csgotm":"null",
   "csmoney":{
      "price":109.97
   },
   "skinport":{
      "suggested_price":71.78,
      "steam_price":0,
      "instant_price":0,
      "starting_at":null
   },
   "csgotrader":{
      "price":97.92
   },
   "csgoempire":61.59,
   "swapgg":95.47,
   "csgoexo":98.3,
   "buff163":{
      "starting_at":{
         "price":75.09
      },
      "highest_order":{
         "price":65.28
      }
   }
},
"\u2605 Shadow Daggers | Doppler (Factory New)":{
   "steam":{
      "last_90d":167.17,
      "last_30d":171.5,
      "last_7d":177.03,
      "last_24h":185.34
   },
   "bitskins":{
      "price":"155.74",
      "instant_sale_price":"62.3"
   },
   "lootfarm":185.92,
   "csgotm":"135.825",
   "csmoney":{
      "price":178.89,
      "doppler":{
         "Phase 2":193.58,
         "Phase 4":216.46,
         "Black Pearl":322.49,
         "Phase 1":191.44,
         "Sapphire":571.21,
         "Phase 3":178.89,
         "Ruby":463.07,
         "(Factory New)":0
      }
   },
   "skinport":{
      "suggested_price":541.92,
      "steam_price":0,
      "instant_price":0,
      "starting_at":123.76
   },
   "csgotrader":{
      "price":185.34,
      "doppler":{
         "Phase 2":171.84,
         "Phase 4":192.15,
         "Black Pearl":286.27,
         "Phase 1":169.94,
         "Sapphire":507.06,
         "Phase 3":158.8,
         "Ruby":411.07,
         "(Factory New)":0.0
      }
   },
   "csgoempire":113.99,
   "swapgg":175.39,
   "csgoexo":186.0,
   "buff163":{
      "starting_at":{
         "price":130.1,
         "doppler":{
            "Sapphire":385.85,
            "Ruby":310.91,
            "Black Pearl":222.19,
            "Emerald":"null",
            "Phase 1":130.1,
            "Phase 2":141.44,
            "Phase 3":130.25,
            "Phase 4":139.29
         }
      },
      "highest_order":{
         "price":127.34,
         "doppler":{
            "Sapphire":372.36,
            "Ruby":283.49,
            "Black Pearl":201.35,
            "Emerald":"null",
            "Phase 1":127.49,
            "Phase 2":128.87,
            "Phase 3":127.34,
            "Phase 4":134.85
         }
      }
   }
},

我试图通过删除无用的类别，如蒸汽，bitskins，lootfarm和其他，使文件更小，所以只剩下buff163。最好的方法是什么？哦，我也在用python做这个

Answer 1

我会这样做：

[json[key]["buff163"] for key in [*json.keys()]]