py::exec(cmd.c_str(), main_namespace);
py::exec("import signal", main_namespace);
py::exec("signal.signal(signal.SIGINT, signal.SIG_DFL)", main_namespace);
py::exec(cmd.c_str(), main_namespace);
py::exec("import signal", main_namespace);
py::exec("signal.signal(signal.SIGINT, signal.SIG_DFL)", main_namespace);