title: How to use python to extract the mentions?
body: <p>I'm working on a code using python to extract the mentions from a tweet text. </p>
  
  <p>The parameter is a tweet text. This function should return a list containing all of the mentions in the tweet, in the order they appear in the tweet. Each mention in the returned list should have the initial mention symbol removed, and the list should contain every mention encountered — including repeats, if a user is mentioned more than once within a tweet.Here are two examples:</p>
  
  <pre><code>&gt;&gt;&gt;extract_mentions('@AndreaTantaros- You are a true journalistic\
  professional. I so agree with what you say. Keep up the great\
  work!@RepJohnLewis ')
  ['AndreaTantaros','RepJohnLewis']
  &gt;&gt;&gt;extract_mentions('@CPAC For all the closet #libertarians attending \
  #CPAC2016 , I'll be there Thurs/Fri -- speaking Thurs. a.m. on the main\
  stage. Look me up! @CPAC')
  ['CPAC','CPAC']
  </code></pre>
  
  <p>a mention begins with the '@' symbol and contains all alphanumeric characters up to (but not including) a space character, punctuation, or the end of a tweet.</p>
  
  <p>How can I extract the mentions from the string? And sorry, I haven't learned about regex, is there any other ways? </p>