title: Finding the longest word
body: <p>I have a problem with finding the longest word from list of words in python. I wrote code, but it said:</p>
  <pre><code>ValueError: Keyword arguments are not supported by this function on line 2
  </code></pre>
  <p>Code:</p>
  <pre><code>def find_longest_word(words_list):
      longest_string = max(words_list, key=len) 
      print(longest_string) 
  </code></pre>
  <p>Do you know why it doesn't work?</p>