title: Create list of object attributes in python
body: <p>I have a list of objects:</p>
  
  <pre><code>[Object_1, Object_2, Object_3]
  </code></pre>
  
  <p>Each object has an attribute: time:</p>
  
  <pre><code>Object_1.time = 20
  Object_2.time = 30
  Object_3.time = 40
  </code></pre>
  
  <p>I want to create a list of the time attributes:</p>
  
  <pre><code>[20, 30, 40]
  </code></pre>
  
  <p>What is the most efficient way to get this output?  It can't be to iterate over the object list, right?:</p>
  
  <pre><code>items = []
  for item in objects:
      items.append(item.time)
  </code></pre>