title: creating tuple with repeating elements
body: <p>I am trying to create tuple of following kind:</p>
  
  <pre><code>('a', 0), ('b', 0), ('a', 1), ('b', 1), ('a', 2), ('b', 2), ('a', 3), ('b', 3)
  </code></pre>
  
  <p>from arrays:</p>
  
  <p><code>A = ['a','b']</code> and numbers 0 through 3.</p>
  
  <p>What is good pythonic representation as I am ending with a real for loop here.</p>