title: Python "Every Other Element" Idiom
body: <p>I feel like I spend a lot of time writing code in Python, but not enough time creating Pythonic code.  Recently I ran into a funny little problem that I thought might have an easy, idiomatic solution.  Paraphrasing the original, I needed to collect every sequential pair in a list.  For example, given the list <code>[1,2,3,4,5,6]</code>, I wanted to compute <code>[(1,2),(3,4),(5,6)]</code>.</p>
  
  <p>I came up with a quick solution at the time that looked like translated Java.  Revisiting the question, the best I could do was</p>
  
  <pre><code>l = [1,2,3,4,5,6]
  [(l[2*x],l[2*x+1]) for x in range(len(l)/2)]
  </code></pre>
  
  <p>which has the side effect of tossing out the last number in the case that the length isn't even.</p>
  
  <p>Is there a more idiomatic approach that I'm missing, or is this the best I'm going to get?</p>