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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 annotate_image(self, request, retry=None, timeout=None):
 """Run image detection and annotation for an image. Example: Args: request (:class:`~.vision_v1.types.AnnotateImageRequest`) retry (Optional[google.api_core.retry.Retry]):
 A retry object used to retry requests. If ``None`` is specified, requests will not be retried. timeout (Optional[float]):
 The amount of time, in seconds, to wait for the request to complete. Note that if ``retry`` is specified, the timeout applies to each individual attempt. Returns: :class:`~.vision_v1.types.AnnotateImageResponse` The API response. """

        # If the image is a file handler, set the content.
        image = protobuf.get(request, "image")
        if hasattr(image, "read"):
            img_bytes = image.read()
            protobuf.set(request, "image", {})
            protobuf.set(request, "image.content", img_bytes)
            image = protobuf.get(request, "image")

        # If a filename is provided, read the file.
        filename = protobuf.get(image, "source.filename", default=None)
        if filename:
            with io.open(filename, "rb") as img_file:
                protobuf.set(request, "image.content", img_file.read())
                protobuf.set(request, "image.source", None)

        # This method allows features not to be specified, and you get all
        # of them.
        protobuf.setdefault(request, "features", self._get_all_features())
        r = self.batch_annotate_images([request], retry=retry, timeout=timeout)
        return r.responses[0]