title: multiply all the integers in a list of lists python?
body: <p>I want to multiply all the values in a list of lists in python:</p>
  
  <pre><code>    input = 3*[[1,2,3],[3,2,1]]
  </code></pre>
  
  <p>so i get this output:</p>
  
  <pre><code>    output = [[3,6,9],[9,6,3]]
  </code></pre>
  
  <p>i tried this:</p>
  
  <pre><code>    l = [[1,2,3],[3,2,1]]
      l = [i * 2 for i in x in l]
  </code></pre>