docs: def open(self, mode='r', name=None, **kwargs):
          """Opens this file, or a file under this directory.
  
          ``path.open(mode, name)`` is a shortcut for ``(path/name).open(mode)``.
  
          Note that this uses :func:`io.open()` which behaves differently from
          :func:`open()` on Python 2; see the appropriate documentation.
  
          :param name: Path component to append to this path before opening the
              file.
          """
          if name is not None:
              return io.open((self / name).path, mode=mode, **kwargs)
          else:
              return io.open(self.path, mode=mode, **kwargs)