title: How to get unique values from a csv file
body: <p>I have this csv file</p>
  
  <pre><code>Cat, and, dog, bites
  Yahoo, news, claims, a, cat, mated, with, a, dog, and, produced, viable, offspring
  Cat, killer, likely, is, a, big, dog
  Professional, free, advice, on, dog, training, puppy, training
  Cat, and, kitten, training, and, behavior
  Dog, &amp;, Cat, provides, dog, training, in Eugene, Oregon
  Dog, and, cat, is, a, slang, term, used, by, police, officers, for, a, male-female, relationship
  Shop, for, your, show, dog, grooming, and, pet, supplies
  </code></pre>
  
  <p>I want to make all the words start with a small letter and create a list which will include all the unique items from the above csv file.
  Have you any idea? Thanks in advance!
  So far, I have managed to convert all the words with a small letter:</p>
  
  <pre><code>unique_row_items = set([field.strip().lower() for field in row])
  </code></pre>
  
  <p>But i can't manage the other one.</p>
  
  <pre><code>def unique():
  
      rows = list(csv.reader(open('example_1.csv', 'r'), delimiter=','))
  
      result = []
  
      for r in rows:
          key = r
          if key not in result:
              result.append(r)
      return result
  </code></pre>
  
  <p>Which does not give the results I want</p>