Discord.py实现双参数DM斜杠命令报错求助

错误原因 #

你把参数user的类型注解语法用错了：Python中类型注解是用参数名: 类型的格式，而你写成了user = discord.Member——这是给参数设置默认值的语法，不是类型注解，导致discord.py无法识别user的参数类型，因此抛出了missing a type annotation错误。

修复后的完整代码 #

@tree.command(guild=discord.Object(id=guild_id), name='userping', description='DM the user to come back to the ticket')
@app_commands.describe(user="The user you want the DM to be sent to", reason="The reason to ping this user")
@app_commands.default_permissions(manage_channels=True)
@app_commands.checks.cooldown(3, 20, key=lambda i: (i.guild_id, i.user.id))
@app_commands.checks.bot_has_permissions(manage_channels=True)
async def userping(interaction: discord.Interaction, user: discord.Member, reason: str):
    # 检查是否在ticket频道
    if "ticket-for-" not in interaction.channel.name:
        await interaction.response.send_message("This isn't a ticket!", ephemeral=True)
        return
    
    # 尝试发送DM并处理异常
    try:
        await user.send(f"You've been pinged regarding your ticket: {reason}")
        await interaction.response.send_message(f"Successfully sent DM to {user.mention}!", ephemeral=True)
    except discord.Forbidden:
        await interaction.response.send_message(f"Failed to send DM to {user.mention} (user has DMs disabled or blocked the bot)", ephemeral=True)

关键修改点 #

1. 修正类型注解：将user = discord.Member改为user: discord.Member，明确参数类型为discord.Member
2. 优化参数顺序：把user参数移到reason前，贴合/dm @user 内容的使用逻辑，让用户先选择成员再输入理由
3. 补充核心功能：添加了DM发送逻辑，同时处理发送失败的情况（比如用户关闭DM或屏蔽机器人）
4. 简化判断逻辑：用not in直接返回提示，减少冗余代码

内容的提问来源于stack exchange，提问作者Lor Lor