old_contents: #!/bin/env python
  
  import asyncio
  import discord
  from discord.ext import commands
  
  
  class Admin:
      def __init__(self, bot):
          self.bot = bot
  
      async def on_member_join(self, ctx):
          await ctx.send('Welcome to the server! For a complete list of commands, type `.help`.')
  
      @commands.command()
      @commands.is_owner()
      async def load(self, ctx, extension_name: str):
          """ Loads an extension """
          try:
              self.bot.load_extension(extension_name)
          except (AttributeError, ImportError) as e:
              return await ctx.send('```py\n{}: {}\n```'.format(type(e).__name__, str(e)))
          await ctx.send('Cog `{}` loaded successfully.'.format(extension_name))
  
  
      @commands.command()
      @commands.is_owner()
      async def unload(self, ctx, extension_name: str):
          """ Unloads an extension. """
          self.bot.unload_extension(extension_name)
          await ctx.send('Cog `{}` has been unloaded.'.format(extension_name))
  
  
      @commands.command(name='reload', aliases='r')
      @commands.is_owner()
      async def _reload(self, ctx, extension_name: str):
          """ Reloads an extension """
          self.bot.unload_extension(extension_name)
          self.bot.load_extension(extension_name)
          await ctx.send('Cog `{}` has been reloaded.'.format(extension_name))
  
      @commands.command(name='reload_all', aliases=['ra'])
      @commands.is_owner()
      async def reload_all(self, ctx):
          """ Reloads all extensions """
  
          # Gets cog list and pops admin cog (can't reload without it)
          ext_list = []
          for extension in self.bot.startup_extensions:
              ext_list.append(extension)
          ext_list.pop(ext_list.index('cogs.admin'))
  
          # Reloads all cogs
          for extension in self.bot.startup_extensions:
              self.bot.unload_extension(extension)
              self.bot.load_extension(extension)
  
          await ctx.send('All cogs have been reloaded.')
  
  
  def setup(bot):
      bot.add_cog(Admin(bot))
  
new_contents: #!/bin/env python
  
  import discord
  from discord.ext import commands
  
  
  class Admin:
      def __init__(self, bot):
          self.bot = bot
  
      async def on_member_join(self, ctx):
          await ctx.send('Welcome to the server! For a complete list of commands, type `.help`.')
  
      @commands.command()
      @commands.is_owner()
      async def load(self, ctx, extension_name: str):
          """ Loads an extension """
          try:
              self.bot.load_extension(extension_name)
          except (AttributeError, ImportError) as e:
              return await ctx.send('```py\n{}: {}\n```'.format(type(e).__name__, str(e)))
          await ctx.send('Cog `{}` loaded successfully.'.format(extension_name))
  
  
      @commands.command()
      @commands.is_owner()
      async def unload(self, ctx, extension_name: str):
          """ Unloads an extension. """
          self.bot.unload_extension(extension_name)
          await ctx.send('Cog `{}` has been unloaded.'.format(extension_name))
  
  
      @commands.command(name='reload', aliases='r')
      @commands.is_owner()
      async def _reload(self, ctx, extension_name: str):
          """ Reloads an extension """
          self.bot.unload_extension(extension_name)
          self.bot.load_extension(extension_name)
          await ctx.send('Cog `{}` has been reloaded.'.format(extension_name))
  
      @commands.command(name='reload_all', aliases=['ra'])
      @commands.is_owner()
      async def reload_all(self, ctx):
          """ Reloads all extensions """
  
          # Gets cog list and pops admin cog (can't reload without it)
          ext_list = []
          for extension in self.bot.startup_extensions:
              ext_list.append(extension)
          ext_list.pop(ext_list.index('cogs.admin'))
  
          # Reloads all cogs
          for extension in self.bot.startup_extensions:
              self.bot.unload_extension(extension)
              self.bot.load_extension(extension)
  
          await ctx.send('All cogs have been reloaded.')
  
  
  def setup(bot):
      bot.add_cog(Admin(bot))
  
subject: remove unused import