Discord.py, Required argument that is missing - python-3.x

Question

from discord.utils import get
import discord
TOKEN = '########' #Taken out
BOT_PREFIX = '!'
ROLE = 'Bot'
bot = commands.Bot(command_prefix=BOT_PREFIX)
#bot.event
async def on_ready():
print("Logged in as: " + bot.user.name + "\n")
#bot.command(pass_context=True)
#commands.has_role("Sergeant") # This must be exactly the name of the appropriate role
async def addrole(ctx, members):
member = ctx.message.author
role = get(member.server.roles, name="Test")
await bot.add_roles(member, role)
bot.run(TOKEN)
So the code above is what I use.
Traceback (most recent call last):
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\bot.py", line 892, in invoke
await ctx.command.invoke(ctx)
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py", line 790, in invoke
await self.prepare(ctx)
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py", line 751, in prepare
await self._parse_arguments(ctx)
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py", line 670, in _parse_arguments
transformed = await self.transform(ctx, param)
File "C:\Users\Joshua\AppData\Local\Programs\Python\Python37-32\lib\site-packages\discord\ext\commands\core.py", line 516, in transform
raise MissingRequiredArgument(param)
discord.ext.commands.errors.MissingRequiredArgument: author is a required argument that is missing.
And this is the error, I belive this is todo with the rewrite but honestly I can't get to grips with it. If anyboby could shine some light on this I would really appreciate it.

Answer 1

Alright, so first you need to import commands from discord at the top of your file. Your bot variable calls this when grabbing the prefix:
from discord.ext import commands
Next, you no longer need pass_content=True in #bot.command(), as context is now always passed. The documentation stating that can be found here.
I noticed that you are checking if the author has a role by name. Although this does work, a better method is checking if the author has the permissions to manage roles, or if he/she is an administrator. That is typed like so:
#commands.has_permissions(administrator=True)
A full list of the different arguments that you can pass into that decorator are found here.
Now regarding your error message, you have a parameter called members in your command function. Since this is a positional parameter, you must provide it when typing your command in discord. However, its not doing anything in your code, so you can remove it:
async def addrole(ctx):
More info on command parameters can be found here.
In you variable named member, you can change ctx.message.author to ctx.author.
In the role variable, when attempting to get the roles on your server, we no longer use member.server.roles. It has been changed to guild, as shown in the docs. Here's how you would type it:
role = get(member.guild.roles, name="Test")
And the final change is adding the role to the member. The rewrite version of discord.py removed a lot of functionality from bot. The add_roles function is now called from a member object, so this would be written like so:
await member.add_roles(role)
We're taking your member variable (ctx.author, which is a member object) and adding a role (the role variable, which fetches a role object with the name Test) to that member. Docs on it are found here.
So your code should look something like this:
from discord.ext import commands
from discord.utils import get
import discord
TOKEN = '########' # Taken out
BOT_PREFIX = '!'
ROLE = 'Bot'
bot = commands.Bot(command_prefix=BOT_PREFIX)
#bot.event
async def on_ready():
print(f"Logged in as: {bot.user.name}")
#bot.command()
#commands.has_permissions(administrator=True)
async def addrole(ctx):
member = ctx.author
role = get(member.guild.roles, name="Test")
await member.add_roles(role)
bot.run(TOKEN)
I hope this helps with your problem :-)
Here's some links that can help you get a better grip on how discord.py-rewrite works:
Migrating to the rewrite branch
Discord.py Rewrite API