title: Creating a dictionary in a dictionary comprehension
body: <p>I have a list with repeated values and I want to count them using a dictionary comprehension</p>
  
  <p>Here is my initial attempt         </p>
  
  <pre><code>number_list = [1,1,2,2,3,3,4,4,5,5]
  number_count_dict = {i:1 for i in number_list}
  {k: (number_count_dict[k]+1 if k in number_count_dict() else 1) for k in number_list}
  </code></pre>
  
  <p>Is there a way of achieving this without initialising the dictionary?</p>