docs: def delete(self, key):
          """Remove a value from the `DotDict`.
  
          The `key` parameter can either be a regular string key,
          e.g. "foo", or it can be a string key with dot notation,
          e.g. "foo.bar.baz", to signify a nested element.
  
          If the key does not exist in the `DotDict`, it will continue
          silently.
  
          Args:
              key (str): The key to remove.
          """
          dct = self
          keys = key.split('.')
          last_key = keys[-1]
          for k in keys:
              # if the key is the last one, e.g. 'z' in 'x.y.z', try
              # to delete it from its dict.
              if k == last_key:
                  del dct[k]
                  break
  
              # if the dct is a DotDict, get the value for the key `k` from it.
              if isinstance(dct, DotDict):
                  dct = super(DotDict, dct).__getitem__(k)
  
              # otherwise, just get the value from the default __getitem__
              # implementation.
              else:
                  dct = dct.__getitem__(k)
                  if not isinstance(dct, (DotDict, dict)):
                      raise KeyError(
                          'Subkey "{}" in "{}" invalid for deletion'.format(k, key)
                      )