title: How to make a discord.py bot private/direct message someone who's not the author?
body: <p>Say I want to make a bot with a "poke" feature (aka sends a pm to a user saying "Boop" when someone says "!poke @user#0000"), how would I do this? It works perfectly when I do this:</p>
  
  <pre><code>@bot.command(pass_context=True)
  async def poke(ctx, message):
      await client.send_message(ctx.message.author, 'boop')
  </code></pre>
  
  <p>but only if I want to poke the <em>author</em> of the message. I want to poke whoever's being @'d.</p>
  
  <p>I know the discord.py documents say I can use this:</p>
  
  <pre><code>start_private_message(user)
  </code></pre>
  
  <p>but I don't know what to put in place of user.</p>