code: def compare_dicts(old=None, new=None):
      '''
      Compare before and after results from various salt functions, returning a
      dict describing the changes that were made.
      '''
      ret = {}
      for key in set((new or {})).union((old or {})):
          if key not in old:
              # New key
              ret[key] = {'old': '',
                          'new': new[key]}
          elif key not in new:
              # Key removed
              ret[key] = {'new': '',
                          'old': old[key]}
          elif new[key] != old[key]:
              # Key modified
              ret[key] = {'old': old[key],
                          'new': new[key]}
      return ref compare_dicts(old=None, new=None):
      '''
      Compare before and after results from various salt functions, returning a
      dict describing the changes that were made.
      '''
      ret = {}
      for key in set((new or {})).union((old or {})):
          if key not in old:
              # New key
              ret[key] = {'old': '',
                          'new': new[key]}
          elif key not in new:
              # Key removed
              ret[key] = {'new': '',
                          'old': old[key]}
          elif new[key] != old[key]:
              # Key modified
              ret[key] = {'old': old[key],
                          'new': new[key]}
      return ret
docs: Compare before and after results from various salt functions, returning a
      dict describing the changes that were made.