title: How to get comments from last week using PRAW?
body: <p>I'm reading the <a href="https://praw.readthedocs.org/en/latest/pages/code_overview.html#praw.objects.Redditor.get_comments" rel="nofollow">doc for <code>get_comments</code></a> and I can't figure out what the correct input for the <code>time</code> parameter is. I know the default is "all", but do I input specific dates, or does it have to be words like "day", "week", etc?</p>
  
  <p>Say I want to get comments a user made within the week, would it be something like:</p>
  
  <pre><code>r = praw.Reddit(user_agent='blah')
  user = r.get_redditor(username)
  comments = user.get_comments(sort='new', time='week', limit=None)
  </code></pre>