title: How to write a dictionary comprehension and deriving a new dictionary with some changes
body: <p>This is the code that is given:</p>
  <p>`
  }</p>
  <pre><code>
  and I want to write a dictionary comprehension to derive a new dict object, called brazilian_players2, that maps a Brazilian player's name to his position!
  
  I came up with:
  </code></pre>
  <p>brazilian_players2 = { 'Brazil' : players['Brazil'] for x in players['Brazil'] }</p>
  <pre><code>
  but this only gives me the complete team.
  I would like to have this outcome:
  </code></pre>
  <p>{'Júlio César', 'Goalkeeper'}
  ...
  }</p>
  <pre><code>or like 
  ```{&quot;player_name&quot;, &quot;player_position&quot;}```
  </code></pre>