title: Chain iterable with strip
body: <p>Is it possible to strip the iterable below without resorting to a list comprehension?</p>
  
  <pre><code>&gt;&gt;&gt; values=f.df['AvailableInTerritories'].tolist()
  &gt;&gt;&gt; values
  ['AU, CA,GB,US', 'AU, CA, GB, US', 'AU, AT, CA, GB, US', 'AU, CA, GB, US', 'AU, CA, GB, US']
  &gt;&gt;&gt; list_separator=','
  
  &gt;&gt;&gt; [item.strip() for item in itertools.chain.from_iterable((str(_val).split(list_separator) for _val in values))]
  ['AU', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US', 'AU', 'AT', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US', 'AU', 'CA', 'GB', 'US']
  </code></pre>