title: The 'isalnum' method doesn't work properly in the code
body: <p>I just start learning Python a few days, and this is a silly question. I think this code should return false as the input characters are not alpha, but I don't understand why it will return true. How do I set up to make sure this method works properly.
  ``</p>
  <pre><code>word='½Ã'
  if word.isalnum():
      print(&quot;it's true&quot;)
  else:
      print(&quot;it's not alpha&quot;)
  </code></pre>
  <p>``
  <a href="https://i.stack.imgur.com/5EQH1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5EQH1.png" alt="enter image description here" /></a></p>