title: how to use strip in map function
body: <p>I'd like to use map to get list of strings:</p>
  
  <pre><code>value = '1, 2, 3'
  
  my_list = list(map(strip, value.split(',')))
  </code></pre>
  
  <p>but got:</p>
  
  <pre><code>NameError: name 'strip' is not defined
  </code></pre>
  
  <p>expected result: <code>my_list=['1','2','3']</code> </p>