title: Different meanings of brackets in Python
body: <p>I am curious, what do the 3 different brackets mean in Python programming? Not sure if I'm correct about this, but please correct me if I'm wrong:</p>
  <ul>
  <li><code>[]</code> - Normally used for dictionaries, list items</li>
  <li><code>()</code> - Used to identify params</li>
  <li><code>{}</code> - I have no idea what this does...</li>
  </ul>
  <p>Or if these brackets can be used for other purposes, any advice is welcomed! Thanks!</p>