code: def download_to_file(self, file_obj, client=None, start=None, end=None):
          
          download_url = self._get_download_url()
          headers = _get_encryption_headers(self._encryption_key)
          headers["accept-encoding"] = "gzip"
  
          transport = self._get_transport(client)
          try:
              self._do_download(transport, file_obj, download_url, headers, start, end)
          except resumable_media.InvalidResponse as exc:
              _raise_from_invalid_response(exc)
docs: Download the contents of this blob into a file-like object.
  
          .. note::
  
             If the server-set property, :attr:`media_link`, is not yet
             initialized, makes an additional API request to load it.
  
          Downloading a file that has been encrypted with a `customer-supplied`_
          encryption key:
  
           .. literalinclude:: snippets.py
              :start-after: [START download_to_file]
              :end-before: [END download_to_file]
              :dedent: 4
  
          The ``encryption_key`` should be a str or bytes with a length of at
          least 32.
  
          For more fine-grained control over the download process, check out
          `google-resumable-media`_. For example, this library allows
          downloading **parts** of a blob rather than the whole thing.
  
          If :attr:`user_project` is set on the bucket, bills the API request
          to that project.
  
          :type file_obj: file
          :param file_obj: A file handle to which to write the blob's data.
  
          :type client: :class:`~google.cloud.storage.client.Client` or
                        ``NoneType``
          :param client: Optional. The client to use.  If not passed, falls back
                         to the ``client`` stored on the blob's bucket.
  
          :type start: int
          :param start: Optional, the first byte in a range to be downloaded.
  
          :type end: int
          :param end: Optional, The last byte in a range to be downloaded.
  
          :raises: :class:`google.cloud.exceptions.NotFound`