def download_to_stream_by_name(self, filename, destination, revision=-1,
                                   session=None):
        """Write the contents of `filename` (with optional `revision`) to
        `destination`.

        For example::

          my_db = MongoClient().test
          fs = GridFSBucket(my_db)
          # Get file to write to
          file = open('myfile','wb')
          fs.download_to_stream_by_name("test_file", file)

        Raises :exc:`~gridfs.errors.NoFile` if no such version of
        that file exists.

        Raises :exc:`~ValueError` if `filename` is not a string.

        :Parameters:
          - `filename`: The name of the file to read from.
          - `destination`: A file-like object that implements :meth:`write`.
          - `revision` (optional): Which revision (documents with the same
            filename and different uploadDate) of the file to retrieve.
            Defaults to -1 (the most recent revision).
          - `session` (optional): a
            :class:`~pymongo.client_session.ClientSession`

        :Note: Revision numbers are defined as follows:

          - 0 = the original stored file
          - 1 = the first revision
          - 2 = the second revision
          - etc...
          - -2 = the second most recent revision
          - -1 = the most recent revision

        .. versionchanged:: 3.6
           Added ``session`` parameter.
        """
        with self.open_download_stream_by_name(
                filename, revision, session=session) as gout:
            for chunk in gout:
                destination.write(chunk)
Write the contents of `filename` (with optional `revision`) to
        `destination`.

        For example::

          my_db = MongoClient().test
          fs = GridFSBucket(my_db)
          # Get file to write to
          file = open('myfile','wb')
          fs.download_to_stream_by_name("test_file", file)

        Raises :exc:`~gridfs.errors.NoFile` if no such version of
        that file exists.

        Raises :exc:`~ValueError` if `filename` is not a string.

        :Parameters:
          - `filename`: The name of the file to read from.
          - `destination`: A file-like object that implements :meth:`write`.
          - `revision` (optional): Which revision (documents with the same
            filename and different uploadDate) of the file to retrieve.
            Defaults to -1 (the most recent revision).
          - `session` (optional): a
            :class:`~pymongo.client_session.ClientSession`

        :Note: Revision numbers are defined as follows:

          - 0 = the original stored file
          - 1 = the first revision
          - 2 = the second revision
          - etc...
          - -2 = the second most recent revision
          - -1 = the most recent revision

        .. versionchanged:: 3.6
           Added ``session`` parameter.
        
stackoverflow/venv/lib/python3.6/site-packages/gridfs/__init__.py