func machine(): PyStr {....raises: [], tags: [], forbids: [].}

func python_implementation(): PyStr {....raises: [], tags: [], forbids: [].}

func system(): PyStr {....raises: [], tags: [], forbids: [].}

proc version(): PyStr {....raises: [OSError, IOError],
                        tags: [ExecIOEffect, ReadIOEffect, RootEffect],
                        forbids: [].}