title: Cartesian product of two lists in python
body: <p>Cartesian product of two lists in python</p>
  
  <pre><code>list1 = ['a', 'b']
  list2 = [1, 2, 3, 4, 5]
  </code></pre>
  
  <p>Expected Output:</p>
  
  <pre><code>list3 = ['a1', 'a2', 'a3', 'a4', 'a5', 'b1', 'b2', 'b3', 'b4', 'b5']
  </code></pre>