__init__.py 文件源码

def _read_file(self, blob, format):
        """Reads a non-notebook file.

        blob: instance of :class:`google.cloud.storage.Blob`.
        format:
          If "text", the contents will be decoded as UTF-8.
          If "base64", the raw bytes contents will be encoded as base64.
          If not specified, try to decode as UTF-8, and fall back to base64
        """
        bcontent = blob.download_as_string()

        if format is None or format == "text":
            # Try to interpret as unicode if format is unknown or if unicode
            # was explicitly requested.
            try:
                return bcontent.decode("utf8"), "text"
            except UnicodeError:
                if format == "text":
                    raise web.HTTPError(
                        400, "%s is not UTF-8 encoded" %
                             self._get_blob_path(blob),
                        reason="bad format",
                    )
        return base64.encodebytes(bcontent).decode("ascii"), "base64"