title: I want to make a blacklist command that blocks an invite from a specific guild discord.py
body: <p>I'm pretty new to all of this. I want to make a command that blocks user from sending a link from blacklisted guild.
  The command would look like this:
  <em>!blacklist (guild id) reason</em>
  This is the code so far</p>
  <pre><code>async def server_blacklist(ctx, guild_id: int,*,reason= &quot;no reason provided&quot;):
      guild = client.get_guild(guild_id)
      invitelink = await delete_invite(guild)
  </code></pre>
  <p>My 1st thought is that I need to store the guild ids somehow ( in .txt or .db ). But I don't know how.</p>