title: getting max value of a lambda and its key in one line
body: <p>Let's say I have</p>
  
  <pre><code>a = [11,2,5,-3]
  </code></pre>
  
  <p>I want to apply a lambda (<strong>1/i</strong> for each <strong>i in a</strong>) and I want to get an output as: <strong>i, max(1/i)</strong></p>
  
  <pre><code>output: 2, 0.5
  </code></pre>
  
  <p>How can I achieve it in <strong>one line</strong> of code where calling <strong>max</strong> only once?</p>
  
  <p>I can get like below, but it calls the <strong>max</strong> function twice.</p>
  
  <pre><code>max(a, key = lambda i : 1/i), max([1/i  for i in a])
  </code></pre>