title: Remove non-int from rows in CSV
body: <p>I'm trying to teach myself Python for data analysis and to practice I'm working on analyzing a CSV file containing 27k survey responses.</p>
  <p>The responses take the form of &quot;# - Rating&quot; (For example: &quot;10 - Extremely Interested&quot;)</p>
  <p>Would anyone be able to tell me how would I go about removing everything but the numerical value so that I could plot this data with matplotlib?</p>
  <p>Thank you :)</p>
  <p>Edit: My apologies, here is the code for the df I'm working with:</p>
  <pre><code>likely_recc = pd.read_csv('test_data.csv', usecols = (['How likely are you to recommend this product to a friend?']))
  </code></pre>