title: Write to CSV a List of Tuples of Lists
body: <p>I have the following variable:</p>
  <pre class="lang-py prettyprint-override"><code>data = [(['a', 'b', '3'], ['c', 'a', 'r']),
          (['*', '[', 'e'], ['33', 'gh', 'ew']),
          (['23^', 're#', '4$'], ['tr', 'fF', '5%'])]
  </code></pre>
  <p>I want to write <code>data</code> into a CSV file as follows:</p>
  <pre><code>a c
  b a
  3 r
  
  * 33
  [ gh
  e ew
  
  23^ tr
  re# fF
  4$ 5%
  </code></pre>
  <p>Note that after each iteration I have a black space in between.</p>
  <hr />
  <p>I tried:</p>
  <pre class="lang-py prettyprint-override"><code>import csv 
  with open ('train.csv', 'w') as out:
      writer = csv.writer(out)
      for row in dataset:
          writer.writerows(row)
  </code></pre>
  <p>But does not work properly.</p>