title: Zero padding between values in Python
body: <p>I have problem during low-pass interpolation, I have to fill 1D array with zeros before processing it.</p>
  
  <p>I have something like this: [1 2 3 4 5 6]</p>
  
  <p>I want to have array like this [1 0 2 0 3 0 4 0 5 0 6] so it is L-1 zeros in array where L is the number of all values inside array before zero stuffing. </p>
  
  <p>How to do it in Python?</p>