discord.py公告命令优化：将缩略图URL输入设为可选的实现方法

核心修改逻辑 #

• 拆分原有统一的异常捕获块：将必填的标题、描述输入环节保留在外层全局捕获中，这两个环节超时仍会终止命令
• 把可选的缩略图URL输入环节单独嵌套一层独立的try-except块，仅捕获该环节的超时异常，超时后自动提示并跳过该环节继续执行
• 生成Embed时新增判断逻辑，仅当用户输入了有效URL时才添加缩略图

修改后的完整代码 #

@bot.command(pass_context = True, aliases=[ 'a', 'announce' ])
async def announce_command(ctx):
    await ctx.send(f"**{ctx.author}**, send a title in 60 seconds, to begin embed builder!",delete_after=45)

    def check(m: discord.Message):
        return m.author.id == ctx.author.id and m.channel.id == ctx.channel.id
  
    try:
        # 必填环节：标题输入
        titlemsg = await bot.wait_for(event = 'message', check = check, timeout= 10 )
        await ctx.send(f"**{ctx.author}**, State a description.", delete_after=45)
        # 必填环节：描述输入
        msg= await bot.wait_for(event = 'message', check = check, timeout= 40)
        await ctx.send(f"**{ctx.author}**, State a Url, if you want a thumbnail added.",delete_after=45)
        
        # 可选环节：缩略图URL输入，单独捕获超时
        UrlThmsg = None
        try:
            UrlThmsg = await bot.wait_for(event= 'message', check = check, timeout= 10)
        except asyncio.TimeoutError:
            await ctx.send(f"**{ctx.author}**，将不添加缩略图", delete_after=45)

    except asyncio.TimeoutError:
        await ctx.send(f"**{ctx.author}**, you didn't send any message that meets the check in this channel for 60 seconds..", delete_after=45)
        return
    else:
        embed = d.Embed(title = f"{titlemsg.content}", description = f"{msg.content}", color = 0xFFFFFF)
        # 仅当获取到缩略图URL时才添加缩略图
        if UrlThmsg:
            embed.set_thumbnail(url = f"{UrlThmsg.content}")
        embed.set_footer(text = f'Annouced By {ctx.author}')
    
        await ctx.send('@everyone', embed = embed)

内容的提问来源于stack exchange，提问作者Spooky Hmm