human
Here's a good function header given the following:
I wrote the below code

    def _ResultHook(rpc):
        mapped_errors = [modules_service_pb.ModulesServiceError.INVALID_MODULE, modules_service_pb.ModulesServiceError.TRANSIENT_ERROR]
        _CheckAsyncResult(rpc, mapped_errors, {})
        return list(rpc.response.version_list())
    request = modules_service_pb.GetVersionsRequest()
    if module:
        request.set_module(module)
    response = modules_service_pb.GetVersionsResponse()
    return _MakeAsyncCall('GetVersions', request, response, _ResultHook).get_result()

What's a good function header?
assistant
#Here's a good function header.

def get_versions(module=None):