How to use the gsutil.copy function in gsutil

def upload_split(self):
        """Uploads the individual results recursively to GCS."""
        self.report.populate_upload_directory(output_dir=self._upload_dir)

        # 1. Copy [ID]-summary.json.gz to gs://wptd/[SHA]/[ID]-summary.json.gz.
        gsutil.copy(
            os.path.join(self._upload_dir, self.report.sha_summary_path),
            self.results_gs_url,
            gzipped=True)

        # 2. Copy the individual results recursively if there is any (i.e. if
        # the report is not empty).
        results_dir = os.path.join(
            self._upload_dir, self.report.sha_product_path)
        if os.path.exists(results_dir):
            # gs://wptd/[SHA] is guaranteed to exist after 1, so copying foo to
            # gs://wptd/[SHA] will create gs://wptd/[SHA]/foo according to
            # `gsutil cp --help`.
            gsutil.copy(
                results_dir,
                self.results_gs_url[:self.results_gs_url.rfind('/')],
                gzipped=True)

# 1. Copy [ID]-summary.json.gz to gs://wptd/[SHA]/[ID]-summary.json.gz.
        gsutil.copy(
            os.path.join(self._upload_dir, self.report.sha_summary_path),
            self.results_gs_url,
            gzipped=True)

        # 2. Copy the individual results recursively if there is any (i.e. if
        # the report is not empty).
        results_dir = os.path.join(
            self._upload_dir, self.report.sha_product_path)
        if os.path.exists(results_dir):
            # gs://wptd/[SHA] is guaranteed to exist after 1, so copying foo to
            # gs://wptd/[SHA] will create gs://wptd/[SHA]/foo according to
            # `gsutil cp --help`.
            gsutil.copy(
                results_dir,
                self.results_gs_url[:self.results_gs_url.rfind('/')],
                gzipped=True)

def _download_gcs(self, gcs):
        assert gcs.startswith('gs://')
        ext = self.known_extension(gcs)
        fd, path = tempfile.mkstemp(suffix=ext, dir=self._temp_dir)
        os.close(fd)
        # gsutil will log itself.
        gsutil.copy(gcs, path)
        return path

def upload_raw(self):
        """Uploads the merged raw JSON report to GCS."""
        with tempfile.NamedTemporaryFile(
                suffix='.json.gz', dir=self._temp_dir) as temp:
            self.report.serialize_gzip(temp.name)
            gsutil.copy(temp.name, self.raw_results_gs_url, gzipped=True)