title: Whats the difference between 'for x in list:' and 'for x in list[:]:'
body: <p>I'm following a pygame book and both of these notations appear:</p>
  
  <pre><code>for x in xs:
      # do something with x
  
  for x in xs[:]:
      # do something with x
  </code></pre>
  
  <p>Do they have the same meaning?</p>