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cpython/Python/preconfig.c
Victor Stinner 74f6568bbd
bpo-36301: Add _PyWstrList structure (GH-12343) 
Replace messy _Py_wstrlist_xxx() functions with a new clean
_PyWstrList structure and new _PyWstrList_xxx() functions.

Changes:

* Add _PyCoreConfig.use_module_search_paths to decide if
  _PyCoreConfig.module_search_paths should be computed or not, to
  support empty search path list.
* _PyWstrList_Clear() sets length to 0 and items to NULL, whereas
  _Py_wstrlist_clear() only freed memory.
* _PyWstrList_Append() returns an int, whereas _Py_wstrlist_append()
  returned _PyInitError.
* _PyWstrList uses Py_ssize_t for the length, instead of int.
* Replace (int, wchar_t**) with _PyWstrList in:

  * _PyPreConfig
  * _PyCoreConfig
  * _PyPreCmdline
  * _PyCmdline

* Replace "int orig_argv; wchar_t **orig_argv;"
  with "_PyWstrList orig_argv".
* _PyCmdline and _PyPreCmdline now also copy wchar_argv.
* Rename _PyArgv_Decode() to _PyArgv_AsWstrList().
* PySys_SetArgvEx() now pass the fixed (argc, argv) to
  _PyPathConfig_ComputeArgv0() (don't pass negative argc or NULL
  argv).
* _PyOS_GetOpt() uses Py_ssize_t
2019-03-15 15:08:05 +01:00

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#include "Python.h"
#include "pycore_coreconfig.h"
#include "pycore_getopt.h"
#include "pycore_pystate.h" /* _PyRuntime_Initialize() */
#include <locale.h> /* setlocale() */
#define DECODE_LOCALE_ERR(NAME, LEN) \
(((LEN) == -2) \
? _Py_INIT_USER_ERR("cannot decode " NAME) \
: _Py_INIT_NO_MEMORY())
/* --- File system encoding/errors -------------------------------- */
/* The filesystem encoding is chosen by config_init_fs_encoding(),
see also initfsencoding(). */
const char *Py_FileSystemDefaultEncoding = NULL;
int Py_HasFileSystemDefaultEncoding = 0;
const char *Py_FileSystemDefaultEncodeErrors = NULL;
int _Py_HasFileSystemDefaultEncodeErrors = 0;
void
_Py_ClearFileSystemEncoding(void)
{
if (!Py_HasFileSystemDefaultEncoding && Py_FileSystemDefaultEncoding) {
PyMem_RawFree((char*)Py_FileSystemDefaultEncoding);
Py_FileSystemDefaultEncoding = NULL;
}
if (!_Py_HasFileSystemDefaultEncodeErrors && Py_FileSystemDefaultEncodeErrors) {
PyMem_RawFree((char*)Py_FileSystemDefaultEncodeErrors);
Py_FileSystemDefaultEncodeErrors = NULL;
}
}
/* Set Py_FileSystemDefaultEncoding and Py_FileSystemDefaultEncodeErrors
global configuration variables. */
int
_Py_SetFileSystemEncoding(const char *encoding, const char *errors)
{
char *encoding2 = _PyMem_RawStrdup(encoding);
if (encoding2 == NULL) {
return -1;
}
char *errors2 = _PyMem_RawStrdup(errors);
if (errors2 == NULL) {
PyMem_RawFree(encoding2);
return -1;
}
_Py_ClearFileSystemEncoding();
Py_FileSystemDefaultEncoding = encoding2;
Py_HasFileSystemDefaultEncoding = 0;
Py_FileSystemDefaultEncodeErrors = errors2;
_Py_HasFileSystemDefaultEncodeErrors = 0;
return 0;
}
/* --- _PyArgv ---------------------------------------------------- */
_PyInitError
_PyArgv_AsWstrList(const _PyArgv *args, _PyWstrList *list)
{
_PyWstrList wargv = _PyWstrList_INIT;
if (args->use_bytes_argv) {
size_t size = sizeof(wchar_t*) * args->argc;
wargv.items = (wchar_t **)PyMem_RawMalloc(size);
if (wargv.items == NULL) {
return _Py_INIT_NO_MEMORY();
}
for (Py_ssize_t i = 0; i < args->argc; i++) {
size_t len;
wchar_t *arg = Py_DecodeLocale(args->bytes_argv[i], &len);
if (arg == NULL) {
_PyWstrList_Clear(&wargv);
return DECODE_LOCALE_ERR("command line arguments",
(Py_ssize_t)len);
}
wargv.items[i] = arg;
wargv.length++;
}
_PyWstrList_Clear(list);
*list = wargv;
}
else {
wargv.length = args->argc;
wargv.items = args->wchar_argv;
if (_PyWstrList_Copy(list, &wargv) < 0) {
return _Py_INIT_NO_MEMORY();
}
}
return _Py_INIT_OK();
}
/* --- _PyPreCmdline ------------------------------------------------- */
typedef struct {
_PyWstrList argv;
_PyWstrList xoptions; /* -X options */
} _PyPreCmdline;
static void
precmdline_clear(_PyPreCmdline *cmdline)
{
_PyWstrList_Clear(&cmdline->argv);
_PyWstrList_Clear(&cmdline->xoptions);
}
/* --- _PyPreConfig ----------------------------------------------- */
void
_PyPreConfig_Clear(_PyPreConfig *config)
{
PyMem_RawFree(config->allocator);
config->allocator = NULL;
}
int
_PyPreConfig_Copy(_PyPreConfig *config, const _PyPreConfig *config2)
{
_PyPreConfig_Clear(config);
#define COPY_ATTR(ATTR) config->ATTR = config2->ATTR
#define COPY_STR_ATTR(ATTR) \
do { \
if (config2->ATTR != NULL) { \
config->ATTR = _PyMem_RawStrdup(config2->ATTR); \
if (config->ATTR == NULL) { \
return -1; \
} \
} \
} while (0)
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(coerce_c_locale);
COPY_ATTR(coerce_c_locale_warn);
#ifdef MS_WINDOWS
COPY_ATTR(legacy_windows_fs_encoding);
#endif
COPY_ATTR(utf8_mode);
COPY_ATTR(dev_mode);
COPY_STR_ATTR(allocator);
#undef COPY_ATTR
#undef COPY_STR_ATTR
return 0;
}
void
_PyPreConfig_GetGlobalConfig(_PyPreConfig *config)
{
#define COPY_FLAG(ATTR, VALUE) \
if (config->ATTR == -1) { \
config->ATTR = VALUE; \
}
#define COPY_NOT_FLAG(ATTR, VALUE) \
if (config->ATTR == -1) { \
config->ATTR = !(VALUE); \
}
COPY_FLAG(isolated, Py_IsolatedFlag);
COPY_NOT_FLAG(use_environment, Py_IgnoreEnvironmentFlag);
#ifdef MS_WINDOWS
COPY_FLAG(legacy_windows_fs_encoding, Py_LegacyWindowsFSEncodingFlag);
#endif
COPY_FLAG(utf8_mode, Py_UTF8Mode);
#undef COPY_FLAG
#undef COPY_NOT_FLAG
}
void
_PyPreConfig_SetGlobalConfig(const _PyPreConfig *config)
{
#define COPY_FLAG(ATTR, VAR) \
if (config->ATTR != -1) { \
VAR = config->ATTR; \
}
#define COPY_NOT_FLAG(ATTR, VAR) \
if (config->ATTR != -1) { \
VAR = !config->ATTR; \
}
COPY_FLAG(isolated, Py_IsolatedFlag);
COPY_NOT_FLAG(use_environment, Py_IgnoreEnvironmentFlag);
#ifdef MS_WINDOWS
COPY_FLAG(legacy_windows_fs_encoding, Py_LegacyWindowsFSEncodingFlag);
#endif
COPY_FLAG(utf8_mode, Py_UTF8Mode);
#undef COPY_FLAG
#undef COPY_NOT_FLAG
}
const char*
_PyPreConfig_GetEnv(const _PyPreConfig *config, const char *name)
{
assert(config->use_environment >= 0);
if (!config->use_environment) {
return NULL;
}
const char *var = getenv(name);
if (var && var[0] != '\0') {
return var;
}
else {
return NULL;
}
}
int
_Py_str_to_int(const char *str, int *result)
{
const char *endptr = str;
errno = 0;
long value = strtol(str, (char **)&endptr, 10);
if (*endptr != '\0' || errno == ERANGE) {
return -1;
}
if (value < INT_MIN || value > INT_MAX) {
return -1;
}
*result = (int)value;
return 0;
}
void
_Py_get_env_flag(_PyPreConfig *config, int *flag, const char *name)
{
const char *var = _PyPreConfig_GetEnv(config, name);
if (!var) {
return;
}
int value;
if (_Py_str_to_int(var, &value) < 0 || value < 0) {
/* PYTHONDEBUG=text and PYTHONDEBUG=-2 behave as PYTHONDEBUG=1 */
value = 1;
}
if (*flag < value) {
*flag = value;
}
}
const wchar_t*
_Py_get_xoption(const _PyWstrList *xoptions, const wchar_t *name)
{
for (Py_ssize_t i=0; i < xoptions->length; i++) {
const wchar_t *option = xoptions->items[i];
size_t len;
wchar_t *sep = wcschr(option, L'=');
if (sep != NULL) {
len = (sep - option);
}
else {
len = wcslen(option);
}
if (wcsncmp(option, name, len) == 0 && name[len] == L'\0') {
return option;
}
}
return NULL;
}
static _PyInitError
preconfig_init_utf8_mode(_PyPreConfig *config, const _PyPreCmdline *cmdline)
{
const wchar_t *xopt;
if (cmdline) {
xopt = _Py_get_xoption(&cmdline->xoptions, L"utf8");
}
else {
xopt = NULL;
}
if (xopt) {
wchar_t *sep = wcschr(xopt, L'=');
if (sep) {
xopt = sep + 1;
if (wcscmp(xopt, L"1") == 0) {
config->utf8_mode = 1;
}
else if (wcscmp(xopt, L"0") == 0) {
config->utf8_mode = 0;
}
else {
return _Py_INIT_USER_ERR("invalid -X utf8 option value");
}
}
else {
config->utf8_mode = 1;
}
return _Py_INIT_OK();
}
const char *opt = _PyPreConfig_GetEnv(config, "PYTHONUTF8");
if (opt) {
if (strcmp(opt, "1") == 0) {
config->utf8_mode = 1;
}
else if (strcmp(opt, "0") == 0) {
config->utf8_mode = 0;
}
else {
return _Py_INIT_USER_ERR("invalid PYTHONUTF8 environment "
"variable value");
}
return _Py_INIT_OK();
}
return _Py_INIT_OK();
}
static void
preconfig_init_locale(_PyPreConfig *config)
{
/* Test also if coerce_c_locale equals 1: PYTHONCOERCECLOCALE=1 doesn't
imply that the C locale is always coerced. It is only coerced if
if the LC_CTYPE locale is "C". */
if (config->coerce_c_locale != 0) {
/* The C locale enables the C locale coercion (PEP 538) */
if (_Py_LegacyLocaleDetected()) {
config->coerce_c_locale = 1;
}
else {
config->coerce_c_locale = 0;
}
}
}
static _PyInitError
preconfig_read(_PyPreConfig *config, const _PyPreCmdline *cmdline)
{
_PyPreConfig_GetGlobalConfig(config);
/* isolated and use_environment */
if (config->isolated > 0) {
config->use_environment = 0;
}
/* Default values */
if (config->use_environment < 0) {
config->use_environment = 0;
}
/* legacy_windows_fs_encoding, utf8_mode, coerce_c_locale */
if (config->use_environment) {
#ifdef MS_WINDOWS
_Py_get_env_flag(config, &config->legacy_windows_fs_encoding,
"PYTHONLEGACYWINDOWSFSENCODING");
#endif
const char *env = _PyPreConfig_GetEnv(config, "PYTHONCOERCECLOCALE");
if (env) {
if (strcmp(env, "0") == 0) {
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 0;
}
}
else if (strcmp(env, "warn") == 0) {
config->coerce_c_locale_warn = 1;
}
else {
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 1;
}
}
}
}
#ifdef MS_WINDOWS
if (config->legacy_windows_fs_encoding) {
config->utf8_mode = 0;
}
#endif
if (config->utf8_mode < 0) {
_PyInitError err = preconfig_init_utf8_mode(config, cmdline);
if (_Py_INIT_FAILED(err)) {
return err;
}
}
if (config->coerce_c_locale != 0) {
preconfig_init_locale(config);
}
#ifndef MS_WINDOWS
if (config->utf8_mode < 0) {
/* The C locale and the POSIX locale enable the UTF-8 Mode (PEP 540) */
const char *ctype_loc = setlocale(LC_CTYPE, NULL);
if (ctype_loc != NULL
&& (strcmp(ctype_loc, "C") == 0
|| strcmp(ctype_loc, "POSIX") == 0))
{
config->utf8_mode = 1;
}
}
#endif
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 0;
}
if (config->utf8_mode < 0) {
config->utf8_mode = 0;
}
if (config->coerce_c_locale < 0) {
config->coerce_c_locale = 0;
}
/* dev_mode */
if ((cmdline && _Py_get_xoption(&cmdline->xoptions, L"dev"))
|| _PyPreConfig_GetEnv(config, "PYTHONDEVMODE"))
{
config->dev_mode = 1;
}
if (config->dev_mode < 0) {
config->dev_mode = 0;
}
/* allocator */
if (config->allocator == NULL) {
/* bpo-34247. The PYTHONMALLOC environment variable has the priority
over PYTHONDEV env var and "-X dev" command line option.
For example, PYTHONMALLOC=malloc PYTHONDEVMODE=1 sets the memory
allocators to "malloc" (and not to "debug"). */
const char *allocator = _PyPreConfig_GetEnv(config, "PYTHONMALLOC");
if (allocator) {
config->allocator = _PyMem_RawStrdup(allocator);
if (config->allocator == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
}
if (config->dev_mode && config->allocator == NULL) {
config->allocator = _PyMem_RawStrdup("debug");
if (config->allocator == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
assert(config->coerce_c_locale >= 0);
assert(config->utf8_mode >= 0);
assert(config->isolated >= 0);
assert(config->use_environment >= 0);
assert(config->dev_mode >= 0);
return _Py_INIT_OK();
}
static _PyInitError
get_ctype_locale(char **locale_p)
{
const char *loc = setlocale(LC_CTYPE, NULL);
if (loc == NULL) {
return _Py_INIT_ERR("failed to LC_CTYPE locale");
}
char *copy = _PyMem_RawStrdup(loc);
if (copy == NULL) {
return _Py_INIT_NO_MEMORY();
}
*locale_p = copy;
return _Py_INIT_OK();
}
/* Read the configuration from:
- environment variables
- Py_xxx global configuration variables
- the LC_CTYPE locale
See _PyPreConfig_ReadFromArgv() to parse also command line arguments. */
_PyInitError
_PyPreConfig_Read(_PyPreConfig *config)
{
_PyInitError err;
char *old_loc;
err = get_ctype_locale(&old_loc);
if (_Py_INIT_FAILED(err)) {
return err;
}
/* Set LC_CTYPE to the user preferred locale */
_Py_SetLocaleFromEnv(LC_CTYPE);
err = preconfig_read(config, NULL);
setlocale(LC_CTYPE, old_loc);
return err;
}
int
_PyPreConfig_AsDict(const _PyPreConfig *config, PyObject *dict)
{
#define SET_ITEM(KEY, EXPR) \
do { \
PyObject *obj = (EXPR); \
if (obj == NULL) { \
goto fail; \
} \
int res = PyDict_SetItemString(dict, (KEY), obj); \
Py_DECREF(obj); \
if (res < 0) { \
goto fail; \
} \
} while (0)
#define SET_ITEM_INT(ATTR) \
SET_ITEM(#ATTR, PyLong_FromLong(config->ATTR))
#define FROM_STRING(STR) \
((STR != NULL) ? \
PyUnicode_FromString(STR) \
: (Py_INCREF(Py_None), Py_None))
#define SET_ITEM_STR(ATTR) \
SET_ITEM(#ATTR, FROM_STRING(config->ATTR))
SET_ITEM_INT(isolated);
SET_ITEM_INT(use_environment);
SET_ITEM_INT(coerce_c_locale);
SET_ITEM_INT(coerce_c_locale_warn);
SET_ITEM_INT(utf8_mode);
#ifdef MS_WINDOWS
SET_ITEM_INT(legacy_windows_fs_encoding);
#endif
SET_ITEM_INT(dev_mode);
SET_ITEM_STR(allocator);
return 0;
fail:
return -1;
#undef FROM_STRING
#undef SET_ITEM
#undef SET_ITEM_INT
#undef SET_ITEM_STR
}
/* Parse the command line arguments */
static _PyInitError
preconfig_parse_cmdline(_PyPreConfig *config, _PyPreCmdline *cmdline)
{
_PyOS_ResetGetOpt();
/* Don't log parsing errors into stderr here: _PyCoreConfig_ReadFromArgv()
is responsible for that */
_PyOS_opterr = 0;
do {
int longindex = -1;
int c = _PyOS_GetOpt(cmdline->argv.length, cmdline->argv.items, &longindex);
if (c == EOF || c == 'c' || c == 'm') {
break;
}
switch (c) {
case 'E':
config->use_environment = 0;
break;
case 'I':
config->isolated++;
break;
case 'X':
{
if (_PyWstrList_Append(&cmdline->xoptions, _PyOS_optarg) < 0) {
return _Py_INIT_NO_MEMORY();
}
break;
}
default:
/* ignore other argument:
handled by _PyCoreConfig_ReadFromArgv() */
break;
}
} while (1);
return _Py_INIT_OK();
}
static _PyInitError
preconfig_from_argv(_PyPreConfig *config, const _PyArgv *args)
{
_PyInitError err;
_PyPreCmdline cmdline;
memset(&cmdline, 0, sizeof(cmdline));
err = _PyArgv_AsWstrList(args, &cmdline.argv);
if (_Py_INIT_FAILED(err)) {
goto done;
}
err = preconfig_parse_cmdline(config, &cmdline);
if (_Py_INIT_FAILED(err)) {
goto done;
}
err = preconfig_read(config, &cmdline);
if (_Py_INIT_FAILED(err)) {
goto done;
}
err = _Py_INIT_OK();
done:
precmdline_clear(&cmdline);
return err;
}
/* Read the configuration from:
- command line arguments
- environment variables
- Py_xxx global configuration variables
- the LC_CTYPE locale
See _PyPreConfig_ReadFromArgv() to parse also command line arguments. */
_PyInitError
_PyPreConfig_ReadFromArgv(_PyPreConfig *config, const _PyArgv *args)
{
_PyInitError err;
err = _PyRuntime_Initialize();
if (_Py_INIT_FAILED(err)) {
return err;
}
char *init_ctype_locale = NULL;
int init_utf8_mode = Py_UTF8Mode;
#ifdef MS_WINDOWS
int init_legacy_encoding = Py_LegacyWindowsFSEncodingFlag;
#endif
_PyPreConfig save_config = _PyPreConfig_INIT;
int locale_coerced = 0;
int loops = 0;
err = get_ctype_locale(&init_ctype_locale);
if (_Py_INIT_FAILED(err)) {
goto done;
}
if (_PyPreConfig_Copy(&save_config, config) < 0) {
err = _Py_INIT_NO_MEMORY();
goto done;
}
/* Set LC_CTYPE to the user preferred locale */
_Py_SetLocaleFromEnv(LC_CTYPE);
while (1) {
int utf8_mode = config->utf8_mode;
/* Watchdog to prevent an infinite loop */
loops++;
if (loops == 3) {
err = _Py_INIT_ERR("Encoding changed twice while "
"reading the configuration");
goto done;
}
/* bpo-34207: Py_DecodeLocale() and Py_EncodeLocale() depend
on Py_UTF8Mode and Py_LegacyWindowsFSEncodingFlag. */
Py_UTF8Mode = config->utf8_mode;
#ifdef MS_WINDOWS
Py_LegacyWindowsFSEncodingFlag = config->legacy_windows_fs_encoding;
#endif
err = preconfig_from_argv(config, args);
if (_Py_INIT_FAILED(err)) {
goto done;
}
if (locale_coerced) {
config->coerce_c_locale = 1;
}
/* The legacy C locale assumes ASCII as the default text encoding, which
* causes problems not only for the CPython runtime, but also other
* components like GNU readline.
*
* Accordingly, when the CLI detects it, it attempts to coerce it to a
* more capable UTF-8 based alternative.
*
* See the documentation of the PYTHONCOERCECLOCALE setting for more
* details.
*/
int encoding_changed = 0;
if (config->coerce_c_locale && !locale_coerced) {
locale_coerced = 1;
_Py_CoerceLegacyLocale(0);
encoding_changed = 1;
}
if (utf8_mode == -1) {
if (config->utf8_mode == 1) {
/* UTF-8 Mode enabled */
encoding_changed = 1;
}
}
else {
if (config->utf8_mode != utf8_mode) {
encoding_changed = 1;
}
}
if (!encoding_changed) {
break;
}
/* Reset the configuration before reading again the configuration,
just keep UTF-8 Mode value. */
int new_utf8_mode = config->utf8_mode;
int new_coerce_c_locale = config->coerce_c_locale;
if (_PyPreConfig_Copy(config, &save_config) < 0) {
err = _Py_INIT_NO_MEMORY();
goto done;
}
config->utf8_mode = new_utf8_mode;
config->coerce_c_locale = new_coerce_c_locale;
/* The encoding changed: read again the configuration
with the new encoding */
}
err = _Py_INIT_OK();
done:
if (init_ctype_locale != NULL) {
setlocale(LC_CTYPE, init_ctype_locale);
}
_PyPreConfig_Clear(&save_config);
Py_UTF8Mode = init_utf8_mode ;
#ifdef MS_WINDOWS
Py_LegacyWindowsFSEncodingFlag = init_legacy_encoding;
#endif
return err;
}
static _PyInitError
_PyPreConfig_SetAllocator(_PyPreConfig *config)
{
assert(!_PyRuntime.core_initialized);
PyMemAllocatorEx old_alloc;
PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (_PyMem_SetupAllocators(config->allocator) < 0) {
return _Py_INIT_USER_ERR("Unknown PYTHONMALLOC allocator");
}
/* Copy the pre-configuration with the new allocator */
_PyPreConfig config2 = _PyPreConfig_INIT;
if (_PyPreConfig_Copy(&config2, config) < 0) {
_PyPreConfig_Clear(&config2);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return _Py_INIT_NO_MEMORY();
}
/* Free the old config and replace config with config2. Since config now
owns the data, don't free config2. */
PyMemAllocatorEx new_alloc;
PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &new_alloc);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyPreConfig_Clear(config);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &new_alloc);
*config = config2;
return _Py_INIT_OK();
}
/* Write the pre-configuration:
- set the memory allocators
- set Py_xxx global configuration variables
- set the LC_CTYPE locale (coerce C locale, PEP 538) and set the UTF-8 mode
(PEP 540)
If the memory allocator is changed, config is re-allocated with new
allocator. So calling _PyPreConfig_Clear(config) is safe after this call.
Do nothing if called after Py_Initialize(): ignore the new
pre-configuration. */
_PyInitError
_PyPreConfig_Write(_PyPreConfig *config)
{
if (_PyRuntime.core_initialized) {
/* bpo-34008: Calling this functions after Py_Initialize() ignores
the new configuration. */
return _Py_INIT_OK();
}
if (config->allocator != NULL) {
_PyInitError err = _PyPreConfig_SetAllocator(config);
if (_Py_INIT_FAILED(err)) {
return err;
}
}
_PyPreConfig_SetGlobalConfig(config);
if (config->coerce_c_locale) {
_Py_CoerceLegacyLocale(config->coerce_c_locale_warn);
}
/* Set LC_CTYPE to the user preferred locale */
_Py_SetLocaleFromEnv(LC_CTYPE);
return _Py_INIT_OK();
}
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