def update_version(self, version: Union[http.HttpVersion, str]) -> None:
        """Convert request version to two elements tuple.

        parser HTTP version '1.1' => (1, 1)
        """
        if isinstance(version, str):
            v = [part.strip() for part in version.split(".", 1)]
            try:
                version = http.HttpVersion(int(v[0]), int(v[1]))
            except ValueError:
                raise ValueError(
                    f"Can not parse http version number: {version}"
                ) from None
        self.version = version
Convert request version to two elements tuple.

        parser HTTP version '1.1' => (1, 1)
        
lib/aiohttp/client_reqrep.py