title: All permutations of random value within list of values using python
body: <p>I need to reach the following result using python (thought about itertools), I have 4 rows that each can get one the values = ['v1', 'v2', 'v3'], since we have 3 options and 4 rows, then number of possibilities will be 3^4 = 81</p>
  <p>For example:</p>
  <pre><code>    col1  col2  col3 ....... col81  
  1    v1    v1    v_  
  2    v2    v3
  3    v1    v2
  4    v3    v1
  </code></pre>
  <p>how can I achieve it, in such a way that I cover all the possibilities?</p>