title: Modify keys of multiple dictionaries with the same keys within another dictionary at the same time
body: <p>I am creating a dictionary which includes some values and another dictionary with multiple entries with identical fields (or keys). The structure would be something like this:</p>
  <pre><code>dict = {
          'value1': None,
          'valuei': None,
          'valuen': None
          'newdicts':{
              'subdict1': {
                  'subvalue1': None,
                  'subvaluei': None,
                  'subvaluen': None
              },
              'subdicti': {
                  'subvalue1': None,
                  'subvaluei': None,
                  'subvaluen': None
              },
              'subdictn': {
                  'subvalue1': None,
                  'subvaluei': None,
                  'subvaluen': None
              }
          }
      }
  ``
  
  I would like to build the data structure in a way that I could let it know I want to add a new key to these dictionaries and all of them would be updated and not having to manually change all of them individually. Is this possible?
  
  Thank you very much!
  </code></pre>