title: Save data to csv file using Python
body: <p>My data, that I've extracted from a webpage looks like below after using print statement. </p>
  
  <pre><code>[[u'Neoplasms', u'Medical Subject Headings', u'direct', u'cancer', u'Neoplasms', u'Medical Subject Headings', u'Malignant Neoplasm', u'National Cancer Institute Thesaurus', u'direct', u'cancer', u'Malignant Neoplasm', u'National Cancer Institute Thesaurus']]
  </code></pre>
  
  <p>I'd like to write it to a csv file like this, with each row containing six elements. </p>
  
  <pre><code>Neoplasms, Medical Subject Headings, direct, cancer, Neoplasms, Medical Subject Headings
  Malignant Neoplasm, National Cancer Institute Thesaurus, direct, cancer, Malignant Neoplasm, National Cancer Institute Thesaurus
  </code></pre>
  
  <p>Please suggest me how I can go about doing that. </p>