踢命令（discord.py）

Question

所以我试图制作一个踢命令，以便如果没有任何原因，那么它会说“没有原因”而不是“没有”。别问为什么。

这是我的代码：

@client.command()

@commands.has_permissions(kick_members=True)

async def kick(ctx, user: discord.Member, *, reason: str):

  if reason is None:

    await user.kick()

    await ctx.send(f"**{user}** has been kicked for **no reason**.")

  else:

    await user.kick(reason=reason)

    await ctx.send(f"**{user}** has been kicked for **{reason}**.")

这是错误：

Ignoring exception in command kick:

Traceback (most recent call last):

  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/bot.py", line 903, in invoke

    await ctx.command.invoke(ctx)

  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 847, in invoke

    await self.prepare(ctx)

  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 784, in prepare

    await self._parse_arguments(ctx)

  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 699, in _parse_arguments

    kwargs[name] = await self.transform(ctx, param)

  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 535, in transform

    raise MissingRequiredArgument(param)

discord.ext.commands.errors.MissingRequiredArgument: reason is a required argument that is missing.

我不明白为什么它说“原因是缺少的必需参数”，因为我说如果原因是 None 它会说没有原因？

Answer 1

如果您分配None给reason，那么您可以检查它。例如reason = None。之后，您可以检查命令是否原因为None。这是代码：@client.command()@commands.has_permissions(kick_members=True)async def kick(ctx, user: discord.Member, *, reason = None):  if not reason:    await user.kick()    await ctx.send(f"**{user}** has been kicked for **no reason**.")  else:    await user.kick(reason=reason)    await ctx.send(f"**{user}** has been kicked for **{reason}**.")

Answer 2

很简单，只需写：@client.command()@commands.has_permissions(kick_members=True)    async def kick(self, ctx, user: discord.Member, *, reason=None):        await user.kick(reason=reason)        await ctx.send(f'{user.mention} has been kicked for {reason}!')

Answer 3

您收到该错误是因为您的函数如下所示：async def kick(ctx, user: discord.Member, *, reason: str):Reason 在这里不是可选的，因此它是一个required argument. 这意味着在没有该参数的情况下调用此函数将导致错误。添加默认值使其成为可选。def function(requiredArgument, optionalArgument=defaultValue)在这种情况下，defaultValue应该是None. 现在，当您不为该参数传递任何内容时，将使用它的默认值。这样，您就不再需要添加理由。