title: Why convert map function to list in Pandas DataFrame?
body: <p>For a school assignment, I am analyzing tweets. From the gained Twitter data, we are only interested in the text of the tweet. They are putting it in a DataFrame with this code:</p>
  <pre><code>tweets['text'] =    list(map(lambda tweet: tweet['text'], tweets_data))
  </code></pre>
  <p>I do not understand why the map function is converted to a list. The DataFrame looks good like desired, but I can't understand why it needs to be converted to a list. Can someone please explain this?</p>