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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def download_to_file(self, file_obj, client=None, start=None, end=None):
 """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` """

        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)