discord.py：如何从 json 文件中删除一个值？

Question

我的代码：@bot.command()async def delwarn(ctx, member: discord.Member = None, warnid = None):    if member:          with open('warns.json', 'r') as fcheckifthere:                checkifthere = json.load(fcheckifthere)          if f'{member.id}' in checkifthere.keys():                amount = len(checkifthere[f'{member.id}'])                if f'{warnid}' in checkifthere[f'{member.id}']:                    if not amount == 1:                        # i want to delete the value f"{warnid}"                            del checkifthere[f'{member.id}'][f'{warnid}']                          with open('warns.json', 'w+') as fcheckifthere:                              json.dump(checkifthere, fcheckifthere, sort_keys=True, indent=4)错误：Traceback (most recent call last):  File "C:\Users\user\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\bot.py", line 892, in invoke    await ctx.command.invoke(ctx)  File "C:\Users\user\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\core.py", line 797, in invoke    await injected(*ctx.args, **ctx.kwargs)  File "C:\Users\user\AppData\Local\Programs\Python\Python37\lib\site-packages\discord\ext\commands\core.py", line 92, in wrapped    raise CommandInvokeError(exc) from excdiscord.ext.commands.errors.CommandInvokeError: Command raised an exception: TypeError: list indices must be integers or slices, not str我想删除特定值 f"{warnid}"，但我不知道如何删除此错误。以下是 json 文件的示例：{   305354423801217025: [      0145324124,      2142141244   ]{

Answer 1

您的错误在此行中，您尝试删除警告 ID：

del checkifthere[f'{member.id}'][f'{warnid}']

checkifthere[f'{member.id}']是一个列表，您提供的索引是一个字符串。列表索引必须是整数，所以你有一个错误。

删除列表元素的最简单方法是使用list.remove(element)：

checkifthere[str(member.id)].remove(warnid)

此外，您不需要f strings，您可以使用str()将整数和浮点数转换为字符串。

通过一些重构，您的命令如下所示：

from discord import Member

from discord.ext import commands

from json import load, dump

@bot.command()

async def delwarn(ctx, member: Member = None, warn_id: str = None):

    if not member:

        return

    with open('warns.json', 'r') as file:

        data = load(file)

        member_id = str(member.id)

    if not member_id in data.keys():

        return

    if warn_id in data[member_id] and not len(data[member_id]) == 1:

        with open('warns.json', 'w') as file:

            data[member_id].remove(warn_id)

            dump(data, file, sort_keys=True, indent=4)