title: Passed Pandas Dataframe to_string and want to remove leading and trailing apostrophe's
body: <p>I have a sqlite3 database that i am using Pandas to pull values.  I want to pass these to Highcharts.  My challenge is that I cannot get rid of the leading and trailing apostrophe's in my .to_string output.</p>
  
  <p>My abbreviated steps are:</p>
  
  <ul>
  <li><p><code>ddt = pd.read_sql_query('SELECT sensor_id from humidities limit 10', con)</code></p></li>
  <li><p><code>ddtnb = ddt.to_string(header=False, index=False, index_names=False).split('\\r')</code></p></li>
  <li><p><code>vals = [",".join(ele.split()) for ele in ddtnb]</code></p></li>
  </ul>
  
  <p>my output for vals is:
  <code>['35,35,35,35,35,36,35,35,36,35']</code></p>
  
  <p>I have tried everything but i cannot get rid of the leading and trailing apostrophe's.  Looking for guidance.  Thanks.</p>