title: how shall i call out this function using string format method?
body: <p>i'm learning Python and have began with Google's Python Automation Beginner course. Idk if i chose it right but im already in week 4 and now have started facing confusion. </p>
  
  <p>Fill in the gaps in the nametag function so that it uses the format method to return first_name and the first initial of last_name followed by a period. For example, nametag("Jane", "Smith") should return "Jane S."</p>
  
  <pre><code>  def nametag(first_name, last_name):
  return("___.".format(___))
  </code></pre>