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_INTERNAL_PATHCONFIG_H
#define Py_INTERNAL_PATHCONFIG_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

typedef struct _PyPathConfig {
    /* Full path to the Python program */
    wchar_t *program_full_path;
    wchar_t *prefix;
    wchar_t *exec_prefix;
    /* Set by Py_SetPath(), or computed by _PyConfig_InitPathConfig() */
    wchar_t *module_search_path;
    /* Python program name */
    wchar_t *program_name;
    /* Set by Py_SetPythonHome() or PYTHONHOME environment variable */
    wchar_t *home;
#ifdef MS_WINDOWS
    /* isolated and site_import are used to set Py_IsolatedFlag and
       Py_NoSiteFlag flags on Windows in read_pth_file(). These fields
       are ignored when their value are equal to -1 (unset). */
    int isolated;
    int site_import;
    /* Set when a venv is detected */
    wchar_t *base_executable;
#endif
} _PyPathConfig;

#ifdef MS_WINDOWS
#  define _PyPathConfig_INIT \
      {.module_search_path = NULL, \
       .isolated = -1, \
       .site_import = -1}
#else
#  define _PyPathConfig_INIT \
      {.module_search_path = NULL}
#endif
/* Note: _PyPathConfig_INIT sets other fields to 0/NULL */

PyAPI_DATA(_PyPathConfig) _Py_path_config;
#ifdef MS_WINDOWS
PyAPI_DATA(wchar_t*) _Py_dll_path;
#endif

extern void _PyPathConfig_ClearGlobal(void);
extern PyStatus _PyPathConfig_SetGlobal(
    const struct _PyPathConfig *pathconfig);

extern PyStatus _PyPathConfig_Calculate(
    _PyPathConfig *pathconfig,
    const PyConfig *config);
extern int _PyPathConfig_ComputeSysPath0(
    const PyWideStringList *argv,
    PyObject **path0);
extern int _Py_FindEnvConfigValue(
    FILE *env_file,
    const wchar_t *key,
    wchar_t *value,
    size_t value_size);

#ifdef MS_WINDOWS
extern wchar_t* _Py_GetDLLPath(void);
#endif

extern PyStatus _PyConfig_WritePathConfig(const PyConfig *config);
extern void _Py_DumpPathConfig(PyThreadState *tstate);

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_PATHCONFIG_H */