title: How do i find if an object occurs twice in a list (Python)
body: <p>I have a basic program that lets the user input items into a list. How do i check if an input has been put twice?</p>
  
  <p>This is what i am starting with</p>
  
  <pre><code>a=input("")
  a=a.title()
  abilities=append(a)
  </code></pre>
  
  <p>I have got no further as i cannot find a solution</p>
  
  <p>Thanks so much for the help</p>