Discord.py中@app_commands.required属性不存在的报错问题

问题场景 #

你编写了以下Discord.py命令代码，试图用@app_commands.required设置可选参数：

@client.tree.command(name='decide', description='Bing will now help you to decide what happens')        
@app_commands.describe(choice1 = "What is your 1st choice?")
@app_commands.describe(choice2 = "What is your 2nd choice?")
@app_commands.describe(choice3 = "What is your 3rd choice?")
@app_commands.required(choice3 = False)
@app_commands.describe(choice4 = "What is your 4th choice?")
@app_commands.requiredt(choice3 = False)  # 此处存在装饰器名称拼写错误
@app_commands.describe(choice5 = "What is your 5th choice?")
@app_commands.required(choice3 = False)
async def decide(interaction: discord.Interaction, choice1: str, choice2: str, choice3: str, choice4: str, choice5: str):
    print(choice1, choice2, choice3, choice4, choice5)

运行时触发报错：

Traceback (most recent call last):
  File "C:\Users\relen\Downloads\BingChatAI.py", line 987, in <module>
    @app_commands.required(choice3 = False)
AttributeError: module 'discord.app_commands' has no attribute 'required'

错误原因 #

discord.app_commands模块不存在required装饰器，你可能误读了文档或混淆了其他框架的写法。同时代码中还出现了拼写错误的requiredt装饰器，这也是无效的。

正确的参数必填设置方式 #

在Discord.py的app_commands框架中，标记参数为可选的正确方式是：

• 给函数参数设置默认值= None
• 配合@app_commands.describe添加参数描述即可

具体操作：

1. 删除所有@app_commands.required和写错的@app_commands.requiredt装饰器
2. 给需要设为可选的参数（choice3、choice4、choice5）添加默认值= None
3. 保留@app_commands.describe来定义每个参数的说明文本

修正后的完整代码 #

@client.tree.command(name='decide', description='Bing will now help you to decide what happens')        
@app_commands.describe(choice1 = "What is your 1st choice?")
@app_commands.describe(choice2 = "What is your 2nd choice?")
@app_commands.describe(choice3 = "What is your 3rd choice?")
@app_commands.describe(choice4 = "What is your 4th choice?")
@app_commands.describe(choice5 = "What is your 5th choice?")
async def decide(interaction: discord.Interaction, choice1: str, choice2: str, choice3: str = None, choice4: str = None, choice5: str = None):
    print(choice1, choice2, choice3, choice4, choice5)

修改后，choice1和choice2会被自动标记为必填参数，choice3到choice5则为可选参数，不会再触发AttributeError。

内容的提问来源于stack exchange，提问作者RealyetRelentless