title: How to convert an user input to a set in python?
body: <p>I want to make a set from alphabets of a user input for example:
  input is: &quot;something&quot; and the output must be: { 's', 'o', 'm', 'e', 't', 'h', 'i', 'n', 'g'}
  I wrote it like below but it caused an error saying the input must be iterable!</p>
  <pre><code> str = print(&quot;please enter a string:&quot;)
   str_set = set(str)
   print(str_set)
  </code></pre>