def get_dir_from_zipfile(zip_file, fallback=None):
    """Return the name of the root folder in a zip file.

    :param zip_file: a :class:`zipfile.ZipFile` instance.
    :param fallback: if `None`, the name of the zip file is used. This is
        returned if the zip file contains more than one top-level directory,
        or none at all.
    """
    fallback = fallback or zip_file.filename
    directories = [name for name in zip_file.namelist() if name.endswith("/")
                   and len(PurePath(name).parts) == 1]
    return fallback if len(directories) > 1 else directories[0]
def teardown(self, stage: Optional[str] = None) -> None:
        """
        Execute arbitrary post-profiling tear-down steps.

        Closes the currently open file and stream.
        """
        self._write_stream = None
        if self._output_file is not None:
            self._output_file.close()
            self._output_file = None  # can't pickle TextIOWrapper