title: How can I reach values of a key pair value within a value with list comprehensions?
body: <p>I want to loop through &quot;prices&quot; dict (Imean t1 or t2, not e1 or e2) and get their values by using list comprehensions</p>
  <pre><code>def combine2(ticks: Mapping[str, Generator[Tick, None, None]]) -&gt; None:
      [????]
  
  t1 = Tick(time=datetime.now(), prices={'i1': 11.11, 'i2': 12.12, })
  t2 = Tick(time=datetime.now(), prices={'i1': 13.13, 'i2': 14.14, })
  t3 = Tick(time=datetime.now(), prices={'i1': 15.15, 'i2': 16.16, })
  
  combine2({'e1': t1, 'e2': t2, 'e3': t3})
  </code></pre>