Method PyEnv

imperative/src/test/helper.cpp:38–43

std::unique_ptr<PyEnv> PyEnv::m_instance = nullptr;

PyEnv::PyEnv() {
    mgb_assert(!m_instance);
    auto err = PyImport_AppendInittab(XSTR(MODULE_NAME), &pyinit);
    mgb_assert(!err);
    m_interpreter.reset(new py::scoped_interpreter());
}

PyEnv& PyEnv::instance() {
    if (!m_instance) {