使用 Python 从 Json 文件中删除项目/数据答案

【问题标题】：Remove item / data from Json file with Python使用 Python 从 Json 文件中删除项目/数据
【发布时间】：2021-11-10 14:44:30
【问题描述】：

我有以下名为 weapons.json 的 .json 文件：

{
  "weapons": [
    {
      "game": "EMPTY",
      "weapon": "EMPTY",
      "down": "0",
      "up": "0",
      "left": "0",
      "right": "0"
    },
    {
      "game": "DELETE",
      "weapon": "DELETE",
      "down": "0",
      "up": "0",
      "left": "0",
      "right": "0"
    }
  ]
}

此数据仅用于测试。

我想从这个文件中删除第二项：

{
  "game": "DELETE",
  "weapon": "DELETE",
  "down": "0",
  "up": "0",
  "left": "0",
  "right": "0"
}

为此，我尝试了以下功能：

#Deleting json info from the selected weapon
def deleteWeapon():
        with open('json/weapons.json') as info:
                weapons_dict =  json.load(info)
        
        for weapon in weapons_dict['weapons']:
                if (weapon['game']=="DELETE" and weapon['weapon']=="DELETE" and weapon['down']=="0" and weapon['up']=="0" and weapon['left']=="0" and weapon['right']=="0"):
                        del weapon
                        
        with open('json/weapons.json','w') as remove:
                json.dump(weapons_dict,remove,indent=2)
                
deleteWeapon()

我尝试使用del weapon 来删除该值，但这不起作用。我也试过做del weapon['XXX'] del weapon['XXX'] 包含所有项目值，但这样做的 .json 看起来像这样。

{
  "weapons": [
    {
      "game": "EMPTY",
      "weapon": "EMPTY",
      "down": "0",
      "up": "0",
      "left": "0",
      "right": "0"
    },
    {}
  ]
}

而不是：

{
  "weapons": [
    {
      "game": "EMPTY",
      "weapon": "EMPTY",
      "down": "0",
      "up": "0",
      "left": "0",
      "right": "0"
    }
  ]
}

很高兴听到任何帮助。

【问题讨论】：

如果需要任何澄清，我正在等待 cmets。
尝试使用武器_dict['weapons'].pop(weapon) 而不是'del Weapon'
@Wimanicesir 我认为从您当前正在迭代的列表中删除项目并不安全。另外我认为.pop(weapon) 会失败，因为weapon 不是int。我想你的意思是.remove(weapon)
@Alexci 请从问题中删除 tkinter 标记，因为问题没有直接链接到 tkinter。
@TheLizzard，已经完成了

标签： python arrays json removechild

【解决方案1】：

试试这个：

weapons = list(weapons_dict["weapons"])
for i, weapon in enumerate(weapons):
    if (weapon['game']=="DELETE" and weapon['weapon']=="DELETE" and weapon['down']=="0" and weapon['up']=="0" and weapon['left']=="0" and weapon['right']=="0"):
        del weapons_dict["weapons"][i]

使用i 作为当前索引遍历列表，然后在需要删除该武器时调用del weapons_dict["weapons"][i]。

【讨论】：

不行，还是不要删除值。
@Alexci 顺便说一句，我解决了这个问题。
是的，它已修复，您的解决方案从 json 中删除数据，也从 json 中删除数据并直接从我的 Treeview 中删除数据。

【解决方案2】：

已经找到解决办法了。

代码应该是这样的：

def deleteWeapon():
        with open('json/weapons.json') as info:
                weapons_dict =  json.load(info)
        
        weapons = list(weapons_dict["weapons"])
        for i, weapon in enumerate(weapons):
                if (weapon['game']=="DELETE" and weapon['weapon']=="DELETE" and weapon['down']=="0" and weapon['up']=="0" and weapon['left']=="0" and weapon['right']=="0"):
                        weapons_dict['weapons'].pop(i)
                        
        with open('json/weapons.json','w') as remove:
                json.dump(weapons_dict,remove,indent=2)

【讨论】：