title: best way of search items of list in another list python?
body: <p>I have a list with 32683 of length and i have to search items of this list in another list with 2905 of length that i wrote it like this:</p>
  
  <pre><code>for item in phone_register_users:
      if item not in service_users_ids:
         counter += 1
  </code></pre>
  
  <p>(length of phone_register_users is 32683 and service_users_ids is 2905)
  but it takes about 14 seconds to complete it and this is too much, how can i improve this?</p>