晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#ifndef Py_CPYTHON_PYLIFECYCLE_H
#  error "this header file must not be included directly"
#endif

/* Py_FrozenMain is kept out of the Limited API until documented and present
   in all builds of Python */
PyAPI_FUNC(int) Py_FrozenMain(int argc, char **argv);

/* PEP 432 Multi-phase initialization API (Private while provisional!) */

PyAPI_FUNC(PyStatus) Py_PreInitialize(
    const PyPreConfig *src_config);
PyAPI_FUNC(PyStatus) Py_PreInitializeFromBytesArgs(
    const PyPreConfig *src_config,
    Py_ssize_t argc,
    char **argv);
PyAPI_FUNC(PyStatus) Py_PreInitializeFromArgs(
    const PyPreConfig *src_config,
    Py_ssize_t argc,
    wchar_t **argv);


/* Initialization and finalization */

PyAPI_FUNC(PyStatus) Py_InitializeFromConfig(
    const PyConfig *config);

// Python 3.8 provisional API (PEP 587)
PyAPI_FUNC(PyStatus) _Py_InitializeMain(void);

PyAPI_FUNC(int) Py_RunMain(void);


PyAPI_FUNC(void) _Py_NO_RETURN Py_ExitStatusException(PyStatus err);

PyAPI_FUNC(int) Py_FdIsInteractive(FILE *, const char *);

/* --- PyInterpreterConfig ------------------------------------ */

#define PyInterpreterConfig_DEFAULT_GIL (0)
#define PyInterpreterConfig_SHARED_GIL (1)
#define PyInterpreterConfig_OWN_GIL (2)

typedef struct {
    // XXX "allow_object_sharing"?  "own_objects"?
    int use_main_obmalloc;
    int allow_fork;
    int allow_exec;
    int allow_threads;
    int allow_daemon_threads;
    int check_multi_interp_extensions;
    int gil;
} PyInterpreterConfig;

#define _PyInterpreterConfig_INIT \
    { \
        .use_main_obmalloc = 0, \
        .allow_fork = 0, \
        .allow_exec = 0, \
        .allow_threads = 1, \
        .allow_daemon_threads = 0, \
        .check_multi_interp_extensions = 1, \
        .gil = PyInterpreterConfig_OWN_GIL, \
    }

// gh-117649: The free-threaded build does not currently support single-phase
// init extensions in subinterpreters. For now, we ensure that
// `check_multi_interp_extensions` is always `1`, even in the legacy config.
#ifdef Py_GIL_DISABLED
#  define _PyInterpreterConfig_LEGACY_CHECK_MULTI_INTERP_EXTENSIONS 1
#else
#  define _PyInterpreterConfig_LEGACY_CHECK_MULTI_INTERP_EXTENSIONS 0
#endif

#define _PyInterpreterConfig_LEGACY_INIT \
    { \
        .use_main_obmalloc = 1, \
        .allow_fork = 1, \
        .allow_exec = 1, \
        .allow_threads = 1, \
        .allow_daemon_threads = 1, \
        .check_multi_interp_extensions = _PyInterpreterConfig_LEGACY_CHECK_MULTI_INTERP_EXTENSIONS, \
        .gil = PyInterpreterConfig_SHARED_GIL, \
    }

PyAPI_FUNC(PyStatus) Py_NewInterpreterFromConfig(
    PyThreadState **tstate_p,
    const PyInterpreterConfig *config);

typedef void (*atexit_datacallbackfunc)(void *);
PyAPI_FUNC(int) PyUnstable_AtExit(
        PyInterpreterState *, atexit_datacallbackfunc, void *);