title: Nested dictionary key and values
body: <pre><code>mydict = {'Papa': {12: {45: {'AG'}}}}
  mydict['Rocks']['Big'] = 'black'
  &gt;&gt;&gt;print(mydict)
  {'Papa': {Marbles: {Small: {'blue'}}}, {'Rocks': {'Big': {'black'}}
  
  [evaluate asdf.py]
  Traceback (most recent call last):
    File "C:/Users/Justin/asdf.py", line 2, in &lt;module&gt;
      mydict['Rocks']['Big'] = 'black'
  builtins.KeyError: 'Rocks'
  </code></pre>
  
  <p>I'm getting a key error...</p>