How to use the kaggle.api.competition_download_file function in kaggle

def _7z_from_kaggle(self):
        import subprocess
        try:
            import kaggle
        except OSError as e:
            raise OSError(
            f""""
            Need to provide Kaggle credentials to download this data set. See guide at
            https://github.com/Kaggle/kaggle-api#api-credentials.
            """
            )
        files =  ['train', 'transactions', 'members_v3']
        print('Downloading from Kaggle...')
        for file in files:
            kaggle.api.competition_download_file('kkbox-churn-prediction-challenge', file + '.csv.7z',
                                                 path=self._path_dir, force=True)
        for file in files:
            print(f"Extracting '{file}'...")
            subprocess.check_output(['7z',  'x', str(self._path_dir / (file + '.csv.7z')),
                                     f"-o{self._path_dir}"])
            print(f"Finished extracting '{file}'.")