title: List formation in python
body: <p>I need to put 3 items in the list.</p>
  
  <ol>
  <li>state..eg(1,2)</li>
  <li>action...eg..west</li>
  <li>cost....5</li>
  </ol>
  
  <p><code>list=[(state,action,cost), (state,action,cost).........]</code></p>
  
  <p>how can i make it in a form of list. For a particular state , action and cost is there. Moreover, if i need only state from the list, i should be able to extract it from the list.same thing goes for action too.</p>