code: def set_nested(data, value, *keys):
      
      if len(keys) == 1:
          data[keys[0]] = value
      else:
          if keys[0] not in data:
              data[keys[0]] = {}
          set_nested(data[keys[0]], value, *keys[1:])
docs: Assign to a nested dictionary.
  
      :param dict data: Dictionary to mutate
      :param value: Value to set
      :param list *keys: List of nested keys
  
      >>> data = {}
      >>> set_nested(data, 'hi', 'k0', 'k1', 'k2')
      >>> data
      {'k0': {'k1': {'k2': 'hi'}}}