尝试获取表情符号 ID 并进行比较时出现“分配前引用的局部变量”错误

Question

I would like to get from an emoji in the ctx.guild the corresponding ID, because this is not changeable and so it is easier to query it and not get in the way if suddenly the name is changed. But now the following problem:

I always get the following error when I try to make an entry in the database:

    roles = rxner.find_one({"role1": role1.id}, {"emoji": emoji2}) # Search for existing entry about role + emoji
UnboundLocalError: local variable 'emoji2' referenced before assignment

My code to get the ID looks like this so far:

for em in ctx.guild.emojis: # loop over emojis
    if str(em.id) == emoji:
        emoji2 = em.id # get the ID
        break # break

roles = rxner.find_one({"role1": role1.id}, {"emoji": emoji2})  # Search for existing entry about role + emoji
emojicheck = rxner.find_one({"emoji": emoji})  # Check which role + emoji belong together
roletofind = rxner.find_one({"role1": role1.id})

This must be where the error is somewhere, but I don't know exactly where.

I've looked at many posts here, even defined emoji globally, but that didn't help. I also tried to return the emoji but none of that works. As I set emoji: str as a required argument in the command that totally works but if the name is changed or something, I can't work with that anymore. Is there a solution how to get the ID in an easier way/fix the problem?

And yes, I looked at the following posts:

• UnboundLocalError: local variable 'x' referenced before assignment in Discord.py
• "UnboundLocalError: local variable 'x' referenced before assignment" But it's a global variable
• "UnboundLocalError: local variable referenced before assignment" after an if statement

Answer 1

The error message is quite clear: emoji2 isn't defined by the time you get to the roles definition. This would mean that str(em.id) == emoji never is true.

Answer 2

As Ulrich Eckhardt in his comment:

It makes sense to use an else statement here. I assume you are looking for a specific emoji while going through the loop?

Since you can have custom emojis and some kind of Unicode emoji, you have to check both ways.

Have a look at the following code:

        for em in ctx.guild.emojis:
            print(em) # We print all the emojis
            if str(em) == emoji: # State what has to match
                emoji2 = em.id # em.id is our emoji2
                print(emoji2) # Prints out the ID
                break # If something was found

        else: # If there is no match and the for-loop is over
            emoji2 = emoji # We just take the str or whatever (unicode emojis)

• Removing str(em.id) and replacing it with str(em) and giving an else -statement should do the trick here.