proc PySys_GetAttr(name: PyStrObject): PyObject {....raises: [],
    tags: [RootEffect], forbids: [].}

proc PySys_GetAttr(name: PyStrObject; value: var PyObject): PyBaseErrorObject {.
    ...raises: [], tags: [RootEffect], forbids: [].}

proc PySys_GetOptionalAttr(name: PyStrObject; value: var PyObject): PyBaseErrorObject {.
    ...raises: [], tags: [RootEffect], forbids: [].}

proc PySys_GetOptionalAttr(name: PyStrObject; value: var PyObject;
                           exists: var bool): PyBaseErrorObject {....raises: [],
    tags: [RootEffect], forbids: [].}

proc PySys_SetAttrNonNil(name: PyStrObject; valueNonNil: PyObject): PyBaseErrorObject {.
    ...raises: [], tags: [RootEffect], forbids: [].}

template sysdict(): PyDictObject