title: fmt.Println prints out format verbs like %s
body: <p>I've written code that is intended to print out keys and values in a map.</p>
  
  <pre><code>kvs := map[string]string{"a": "apple", "b": "banana"}
  for k, v := range kvs {
      fmt.Println("%s -&gt; %s\n", k, v)
  }
  </code></pre>
  
  <p>I'm expecting the output to be:</p>
  
  <pre><code>a -&gt; apple
  b -&gt; banana
  </code></pre>
  
  <p>But the output is actually:</p>
  
  <pre><code>%s -&gt; %s
  a apple
  %s -&gt; %s
  b banana
  </code></pre>