diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index ba8f001..5c2f019 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -377,7 +377,7 @@
     {
         PyObject *RawIO_class = (PyObject *)&PyFileIO_Type;
 #ifdef MS_WINDOWS
-        _PyCoreConfig *config = &_PyInterpreterState_GET_UNSAFE()->core_config;
+        PyConfig *config = &_PyInterpreterState_GET_UNSAFE()->config;
         if (!config->legacy_windows_stdio && _PyIO_get_console_type(path_or_fd) != '\0') {
             RawIO_class = (PyObject *)&PyWindowsConsoleIO_Type;
             encoding = "utf-8";
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 6a0d9be..a5727b8 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -288,7 +288,7 @@
            shutdown issues). */
         if (res == NULL) {
 #ifndef Py_DEBUG
-            const _PyCoreConfig *config = &_PyInterpreterState_GET_UNSAFE()->core_config;
+            const PyConfig *config = &_PyInterpreterState_GET_UNSAFE()->config;
             if (config->dev_mode) {
                 PyErr_WriteUnraisable(self);
             }
diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
index 3a43ec1..3ea77e6 100644
--- a/Modules/_testinternalcapi.c
+++ b/Modules/_testinternalcapi.c
@@ -9,7 +9,7 @@
 #define PY_SSIZE_T_CLEAN
 
 #include "Python.h"
-#include "pycore_coreconfig.h"
+#include "pycore_initconfig.h"
 
 
 static PyObject *
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index aa466c4..f2b5a50 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -1,5 +1,5 @@
 #include "Python.h"
-#include "pycore_coreconfig.h"
+#include "pycore_initconfig.h"
 #include "pycore_traceback.h"
 #include "pythread.h"
 #include <signal.h>
@@ -1315,7 +1315,7 @@
     return 0;
 }
 
-_PyInitError
+PyStatus
 _PyFaulthandler_Init(int enable)
 {
 #ifdef HAVE_SIGALTSTACK
@@ -1340,17 +1340,17 @@
     thread.cancel_event = PyThread_allocate_lock();
     thread.running = PyThread_allocate_lock();
     if (!thread.cancel_event || !thread.running) {
-        return _Py_INIT_ERR("failed to allocate locks for faulthandler");
+        return _PyStatus_ERR("failed to allocate locks for faulthandler");
     }
     PyThread_acquire_lock(thread.cancel_event, 1);
 #endif
 
     if (enable) {
         if (faulthandler_init_enable() < 0) {
-            return _Py_INIT_ERR("failed to enable faulthandler");
+            return _PyStatus_ERR("failed to enable faulthandler");
         }
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 void _PyFaulthandler_Fini(void)
diff --git a/Modules/getpath.c b/Modules/getpath.c
index 3dcfcef..5f80738 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -1,7 +1,7 @@
 /* Return the initial module search path. */
 
 #include "Python.h"
-#include "pycore_coreconfig.h"
+#include "pycore_initconfig.h"
 #include "osdefs.h"
 #include "pycore_fileutils.h"
 #include "pycore_pathconfig.h"
@@ -115,10 +115,10 @@
 
 #define DECODE_LOCALE_ERR(NAME, LEN) \
     ((LEN) == (size_t)-2) \
-     ? _Py_INIT_ERR("cannot decode " NAME) \
-     : _Py_INIT_NO_MEMORY()
+     ? _PyStatus_ERR("cannot decode " NAME) \
+     : _PyStatus_NO_MEMORY()
 
-#define PATHLEN_ERR() _Py_INIT_ERR("path configuration: path too long")
+#define PATHLEN_ERR() _PyStatus_ERR("path configuration: path too long")
 
 typedef struct {
     wchar_t *path_env;                 /* PATH environment variable */
@@ -236,7 +236,7 @@
 
 /* Add a path component, by appending stuff to buffer.
    buflen: 'buffer' length in characters including trailing NUL. */
-static _PyInitError
+static PyStatus
 joinpath(wchar_t *buffer, const wchar_t *stuff, size_t buflen)
 {
     size_t n, k;
@@ -261,7 +261,7 @@
     wcsncpy(buffer+n, stuff, k);
     buffer[n+k] = '\0';
 
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
@@ -280,7 +280,7 @@
 
 /* copy_absolute requires that path be allocated at least
    'pathlen' characters (including trailing NUL). */
-static _PyInitError
+static PyStatus
 copy_absolute(wchar_t *path, const wchar_t *p, size_t pathlen)
 {
     if (p[0] == SEP) {
@@ -294,38 +294,38 @@
             if (safe_wcscpy(path, p, pathlen) < 0) {
                 return PATHLEN_ERR();
             }
-            return _Py_INIT_OK();
+            return _PyStatus_OK();
         }
         if (p[0] == '.' && p[1] == SEP) {
             p += 2;
         }
-        _PyInitError err = joinpath(path, p, pathlen);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        PyStatus status = joinpath(path, p, pathlen);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
 /* path_len: path length in characters including trailing NUL */
-static _PyInitError
+static PyStatus
 absolutize(wchar_t *path, size_t path_len)
 {
     if (path[0] == SEP) {
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     wchar_t abs_path[MAXPATHLEN+1];
-    _PyInitError err = copy_absolute(abs_path, path, Py_ARRAY_LENGTH(abs_path));
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    PyStatus status = copy_absolute(abs_path, path, Py_ARRAY_LENGTH(abs_path));
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (safe_wcscpy(path, abs_path, path_len) < 0) {
         return PATHLEN_ERR();
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
@@ -335,14 +335,14 @@
 #endif
 
 /* pathlen: 'path' length in characters including trailing NUL */
-static _PyInitError
+static PyStatus
 add_exe_suffix(wchar_t *progpath, size_t progpathlen)
 {
     /* Check for already have an executable suffix */
     size_t n = wcslen(progpath);
     size_t s = wcslen(EXE_SUFFIX);
     if (wcsncasecmp(EXE_SUFFIX, progpath + n - s, s) == 0) {
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     if (n + s >= progpathlen) {
@@ -356,7 +356,7 @@
         progpath[n] = '\0';
     }
 
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 #endif
 
@@ -364,43 +364,43 @@
 /* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
    bytes long.
 */
-static _PyInitError
-search_for_prefix(const _PyCoreConfig *core_config, PyCalculatePath *calculate,
+static PyStatus
+search_for_prefix(const PyConfig *config, PyCalculatePath *calculate,
                   wchar_t *prefix, size_t prefix_len,
                   int *found)
 {
-    _PyInitError err;
+    PyStatus status;
     size_t n;
     wchar_t *vpath;
 
     /* If PYTHONHOME is set, we believe it unconditionally */
-    if (core_config->home) {
-        if (safe_wcscpy(prefix, core_config->home, prefix_len) < 0) {
+    if (config->home) {
+        if (safe_wcscpy(prefix, config->home, prefix_len) < 0) {
             return PATHLEN_ERR();
         }
         wchar_t *delim = wcschr(prefix, DELIM);
         if (delim) {
             *delim = L'\0';
         }
-        err = joinpath(prefix, calculate->lib_python, prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(prefix, calculate->lib_python, prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
-        err = joinpath(prefix, LANDMARK, prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(prefix, LANDMARK, prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
         *found = 1;
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     /* Check to see if argv[0] is in the build directory */
     if (safe_wcscpy(prefix, calculate->argv0_path, prefix_len) < 0) {
         return PATHLEN_ERR();
     }
-    err = joinpath(prefix, L"Modules/Setup.local", prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(prefix, L"Modules/Setup.local", prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (isfile(prefix)) {
@@ -410,48 +410,48 @@
             if (safe_wcscpy(prefix, calculate->argv0_path, prefix_len) < 0) {
                 return PATHLEN_ERR();
             }
-            err = joinpath(prefix, vpath, prefix_len);
+            status = joinpath(prefix, vpath, prefix_len);
             PyMem_RawFree(vpath);
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
 
-            err = joinpath(prefix, L"Lib", prefix_len);
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            status = joinpath(prefix, L"Lib", prefix_len);
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
-            err = joinpath(prefix, LANDMARK, prefix_len);
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            status = joinpath(prefix, LANDMARK, prefix_len);
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
 
             if (ismodule(prefix, prefix_len)) {
                 *found = -1;
-                return _Py_INIT_OK();
+                return _PyStatus_OK();
             }
         }
     }
 
     /* Search from argv0_path, until root is found */
-    err = copy_absolute(prefix, calculate->argv0_path, prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = copy_absolute(prefix, calculate->argv0_path, prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     do {
         n = wcslen(prefix);
-        err = joinpath(prefix, calculate->lib_python, prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(prefix, calculate->lib_python, prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
-        err = joinpath(prefix, LANDMARK, prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(prefix, LANDMARK, prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
 
         if (ismodule(prefix, prefix_len)) {
             *found = 1;
-            return _Py_INIT_OK();
+            return _PyStatus_OK();
         }
         prefix[n] = L'\0';
         reduce(prefix);
@@ -461,59 +461,59 @@
     if (safe_wcscpy(prefix, calculate->prefix, prefix_len) < 0) {
         return PATHLEN_ERR();
     }
-    err = joinpath(prefix, calculate->lib_python, prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(prefix, calculate->lib_python, prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
-    err = joinpath(prefix, LANDMARK, prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(prefix, LANDMARK, prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (ismodule(prefix, prefix_len)) {
         *found = 1;
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     /* Fail */
     *found = 0;
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
-calculate_prefix(const _PyCoreConfig *core_config,
+static PyStatus
+calculate_prefix(const PyConfig *config,
                  PyCalculatePath *calculate, wchar_t *prefix, size_t prefix_len)
 {
-    _PyInitError err;
+    PyStatus status;
 
-    err = search_for_prefix(core_config, calculate, prefix, prefix_len,
+    status = search_for_prefix(config, calculate, prefix, prefix_len,
                             &calculate->prefix_found);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (!calculate->prefix_found) {
-        if (core_config->pathconfig_warnings) {
+        if (config->pathconfig_warnings) {
             fprintf(stderr,
                 "Could not find platform independent libraries <prefix>\n");
         }
         if (safe_wcscpy(prefix, calculate->prefix, prefix_len) < 0) {
             return PATHLEN_ERR();
         }
-        err = joinpath(prefix, calculate->lib_python, prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(prefix, calculate->lib_python, prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
     }
     else {
         reduce(prefix);
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
+static PyStatus
 calculate_reduce_prefix(PyCalculatePath *calculate,
                         wchar_t *prefix, size_t prefix_len)
 {
@@ -536,45 +536,45 @@
             return PATHLEN_ERR();
         }
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
 /* search_for_exec_prefix requires that argv0_path be no more than
    MAXPATHLEN bytes long.
 */
-static _PyInitError
-search_for_exec_prefix(const _PyCoreConfig *core_config,
+static PyStatus
+search_for_exec_prefix(const PyConfig *config,
                        PyCalculatePath *calculate,
                        wchar_t *exec_prefix, size_t exec_prefix_len,
                        int *found)
 {
-    _PyInitError err;
+    PyStatus status;
     size_t n;
 
     /* If PYTHONHOME is set, we believe it unconditionally */
-    if (core_config->home) {
-        wchar_t *delim = wcschr(core_config->home, DELIM);
+    if (config->home) {
+        wchar_t *delim = wcschr(config->home, DELIM);
         if (delim) {
             if (safe_wcscpy(exec_prefix, delim+1, exec_prefix_len) < 0) {
                 return PATHLEN_ERR();
             }
         }
         else {
-            if (safe_wcscpy(exec_prefix, core_config->home, exec_prefix_len) < 0) {
+            if (safe_wcscpy(exec_prefix, config->home, exec_prefix_len) < 0) {
                 return PATHLEN_ERR();
             }
         }
-        err = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
-        err = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
         *found = 1;
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     /* Check to see if argv[0] is in the build directory. "pybuilddir.txt"
@@ -583,9 +583,9 @@
     if (safe_wcscpy(exec_prefix, calculate->argv0_path, exec_prefix_len) < 0) {
         return PATHLEN_ERR();
     }
-    err = joinpath(exec_prefix, L"pybuilddir.txt", exec_prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(exec_prefix, L"pybuilddir.txt", exec_prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (isfile(exec_prefix)) {
@@ -609,36 +609,36 @@
             if (safe_wcscpy(exec_prefix, calculate->argv0_path, exec_prefix_len) < 0) {
                 return PATHLEN_ERR();
             }
-            err = joinpath(exec_prefix, pybuilddir, exec_prefix_len);
+            status = joinpath(exec_prefix, pybuilddir, exec_prefix_len);
             PyMem_RawFree(pybuilddir );
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
 
             *found = -1;
-            return _Py_INIT_OK();
+            return _PyStatus_OK();
         }
     }
 
     /* Search from argv0_path, until root is found */
-    err = copy_absolute(exec_prefix, calculate->argv0_path, exec_prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = copy_absolute(exec_prefix, calculate->argv0_path, exec_prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     do {
         n = wcslen(exec_prefix);
-        err = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
-        err = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
         if (isdir(exec_prefix)) {
             *found = 1;
-            return _Py_INIT_OK();
+            return _PyStatus_OK();
         }
         exec_prefix[n] = L'\0';
         reduce(exec_prefix);
@@ -648,58 +648,58 @@
     if (safe_wcscpy(exec_prefix, calculate->exec_prefix, exec_prefix_len) < 0) {
         return PATHLEN_ERR();
     }
-    err = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(exec_prefix, calculate->lib_python, exec_prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
-    err = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(exec_prefix, L"lib-dynload", exec_prefix_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
     if (isdir(exec_prefix)) {
         *found = 1;
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     /* Fail */
     *found = 0;
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
-calculate_exec_prefix(const _PyCoreConfig *core_config,
+static PyStatus
+calculate_exec_prefix(const PyConfig *config,
                       PyCalculatePath *calculate,
                       wchar_t *exec_prefix, size_t exec_prefix_len)
 {
-    _PyInitError err;
+    PyStatus status;
 
-    err = search_for_exec_prefix(core_config, calculate,
+    status = search_for_exec_prefix(config, calculate,
                                  exec_prefix, exec_prefix_len,
                                  &calculate->exec_prefix_found);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if (!calculate->exec_prefix_found) {
-        if (core_config->pathconfig_warnings) {
+        if (config->pathconfig_warnings) {
             fprintf(stderr,
                 "Could not find platform dependent libraries <exec_prefix>\n");
         }
         if (safe_wcscpy(exec_prefix, calculate->exec_prefix, exec_prefix_len) < 0) {
             return PATHLEN_ERR();
         }
-        err = joinpath(exec_prefix, L"lib/lib-dynload", exec_prefix_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(exec_prefix, L"lib/lib-dynload", exec_prefix_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
     }
     /* If we found EXEC_PREFIX do *not* reduce it!  (Yet.) */
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
+static PyStatus
 calculate_reduce_exec_prefix(PyCalculatePath *calculate,
                              wchar_t *exec_prefix, size_t exec_prefix_len)
 {
@@ -716,15 +716,15 @@
             return PATHLEN_ERR();
         }
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
-calculate_program_full_path(const _PyCoreConfig *core_config,
-                            PyCalculatePath *calculate, _PyPathConfig *config)
+static PyStatus
+calculate_program_full_path(const PyConfig *config,
+                            PyCalculatePath *calculate, _PyPathConfig *pathconfig)
 {
-    _PyInitError err;
+    PyStatus status;
     wchar_t program_full_path[MAXPATHLEN + 1];
     const size_t program_full_path_len = Py_ARRAY_LENGTH(program_full_path);
     memset(program_full_path, 0, sizeof(program_full_path));
@@ -743,8 +743,8 @@
      * other way to find a directory to start the search from.  If
      * $PATH isn't exported, you lose.
      */
-    if (wcschr(core_config->program_name, SEP)) {
-        if (safe_wcscpy(program_full_path, core_config->program_name,
+    if (wcschr(config->program_name, SEP)) {
+        if (safe_wcscpy(program_full_path, config->program_name,
                         program_full_path_len) < 0) {
             return PATHLEN_ERR();
         }
@@ -795,10 +795,10 @@
                 }
             }
 
-            err = joinpath(program_full_path, core_config->program_name,
+            status = joinpath(program_full_path, config->program_name,
                             program_full_path_len);
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
 
             if (isxfile(program_full_path)) {
@@ -816,9 +816,9 @@
         program_full_path[0] = '\0';
     }
     if (program_full_path[0] != SEP && program_full_path[0] != '\0') {
-        err = absolutize(program_full_path, program_full_path_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = absolutize(program_full_path, program_full_path_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
     }
 #if defined(__CYGWIN__) || defined(__MINGW32__)
@@ -828,22 +828,22 @@
      * path (bpo-28441).
      */
     if (program_full_path[0] != '\0') {
-        err = add_exe_suffix(program_full_path, program_full_path_len);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = add_exe_suffix(program_full_path, program_full_path_len);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
     }
 #endif
 
-    config->program_full_path = _PyMem_RawWcsdup(program_full_path);
-    if (config->program_full_path == NULL) {
-        return _Py_INIT_NO_MEMORY();
+    pathconfig->program_full_path = _PyMem_RawWcsdup(program_full_path);
+    if (pathconfig->program_full_path == NULL) {
+        return _PyStatus_NO_MEMORY();
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
+static PyStatus
 calculate_argv0_path(PyCalculatePath *calculate, const wchar_t *program_full_path)
 {
     const size_t argv0_path_len = Py_ARRAY_LENGTH(calculate->argv0_path);
@@ -871,7 +871,7 @@
         ** be running the interpreter in the build directory, so we use the
         ** build-directory-specific logic to find Lib and such.
         */
-        _PyInitError err;
+        PyStatus status;
         size_t len;
         wchar_t* wbuf = Py_DecodeLocale(modPath, &len);
         if (wbuf == NULL) {
@@ -882,15 +882,15 @@
             return PATHLEN_ERR();
         }
         reduce(calculate->argv0_path);
-        err = joinpath(calculate->argv0_path, calculate->lib_python, argv0_path_len);
-        if (_Py_INIT_FAILED(err)) {
+        status = joinpath(calculate->argv0_path, calculate->lib_python, argv0_path_len);
+        if (_PyStatus_EXCEPTION(status)) {
             PyMem_RawFree(wbuf);
-            return err;
+            return status;
         }
-        err = joinpath(calculate->argv0_path, LANDMARK, argv0_path_len);
-        if (_Py_INIT_FAILED(err)) {
+        status = joinpath(calculate->argv0_path, LANDMARK, argv0_path_len);
+        if (_PyStatus_EXCEPTION(status)) {
             PyMem_RawFree(wbuf);
-            return err;
+            return status;
         }
         if (!ismodule(calculate->argv0_path,
                       Py_ARRAY_LENGTH(calculate->argv0_path))) {
@@ -925,11 +925,11 @@
         }
         else {
             /* Interpret relative to program_full_path */
-            _PyInitError err;
+            PyStatus status;
             reduce(calculate->argv0_path);
-            err = joinpath(calculate->argv0_path, tmpbuffer, argv0_path_len);
-            if (_Py_INIT_FAILED(err)) {
-                return err;
+            status = joinpath(calculate->argv0_path, tmpbuffer, argv0_path_len);
+            if (_PyStatus_EXCEPTION(status)) {
+                return status;
             }
         }
         linklen = _Py_wreadlink(calculate->argv0_path, tmpbuffer, buflen);
@@ -939,7 +939,7 @@
     reduce(calculate->argv0_path);
     /* At this point, argv0_path is guaranteed to be less than
        MAXPATHLEN bytes long. */
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
@@ -947,10 +947,10 @@
    executable's directory and then in the parent directory.
    If found, open it for use when searching for prefixes.
 */
-static _PyInitError
+static PyStatus
 calculate_read_pyenv(PyCalculatePath *calculate)
 {
-    _PyInitError err;
+    PyStatus status;
     wchar_t tmpbuffer[MAXPATHLEN+1];
     const size_t buflen = Py_ARRAY_LENGTH(tmpbuffer);
     wchar_t *env_cfg = L"pyvenv.cfg";
@@ -960,9 +960,9 @@
         return PATHLEN_ERR();
     }
 
-    err = joinpath(tmpbuffer, env_cfg, buflen);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(tmpbuffer, env_cfg, buflen);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
     env_file = _Py_wfopen(tmpbuffer, L"r");
     if (env_file == NULL) {
@@ -970,9 +970,9 @@
 
         reduce(tmpbuffer);
         reduce(tmpbuffer);
-        err = joinpath(tmpbuffer, env_cfg, buflen);
-        if (_Py_INIT_FAILED(err)) {
-            return err;
+        status = joinpath(tmpbuffer, env_cfg, buflen);
+        if (_PyStatus_EXCEPTION(status)) {
+            return status;
         }
 
         env_file = _Py_wfopen(tmpbuffer, L"r");
@@ -982,7 +982,7 @@
     }
 
     if (env_file == NULL) {
-        return _Py_INIT_OK();
+        return _PyStatus_OK();
     }
 
     /* Look for a 'home' variable and set argv0_path to it, if found */
@@ -993,14 +993,14 @@
         }
     }
     fclose(env_file);
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
+static PyStatus
 calculate_zip_path(PyCalculatePath *calculate, const wchar_t *prefix)
 {
-    _PyInitError err;
+    PyStatus status;
     const size_t zip_path_len = Py_ARRAY_LENGTH(calculate->zip_path);
     if (safe_wcscpy(calculate->zip_path, prefix, zip_path_len) < 0) {
         return PATHLEN_ERR();
@@ -1016,29 +1016,29 @@
             return PATHLEN_ERR();
         }
     }
-    err = joinpath(calculate->zip_path, L"lib/python00.zip", zip_path_len);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = joinpath(calculate->zip_path, L"lib/python00.zip", zip_path_len);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     /* Replace "00" with version */
     size_t bufsz = wcslen(calculate->zip_path);
     calculate->zip_path[bufsz - 6] = VERSION[0];
     calculate->zip_path[bufsz - 5] = VERSION[2];
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
-calculate_module_search_path(const _PyCoreConfig *core_config,
+static PyStatus
+calculate_module_search_path(const PyConfig *config,
                              PyCalculatePath *calculate,
                              const wchar_t *prefix, const wchar_t *exec_prefix,
-                             _PyPathConfig *config)
+                             _PyPathConfig *pathconfig)
 {
     /* Calculate size of return buffer */
     size_t bufsz = 0;
-    if (core_config->module_search_path_env != NULL) {
-        bufsz += wcslen(core_config->module_search_path_env) + 1;
+    if (config->pythonpath_env != NULL) {
+        bufsz += wcslen(config->pythonpath_env) + 1;
     }
 
     wchar_t *defpath = calculate->pythonpath;
@@ -1067,13 +1067,13 @@
     /* Allocate the buffer */
     wchar_t *buf = PyMem_RawMalloc(bufsz * sizeof(wchar_t));
     if (buf == NULL) {
-        return _Py_INIT_NO_MEMORY();
+        return _PyStatus_NO_MEMORY();
     }
     buf[0] = '\0';
 
     /* Run-time value of $PYTHONPATH goes first */
-    if (core_config->module_search_path_env) {
-        wcscpy(buf, core_config->module_search_path_env);
+    if (config->pythonpath_env) {
+        wcscpy(buf, config->pythonpath_env);
         wcscat(buf, delimiter);
     }
 
@@ -1115,14 +1115,14 @@
     /* Finally, on goes the directory for dynamic-load modules */
     wcscat(buf, exec_prefix);
 
-    config->module_search_path = buf;
-    return _Py_INIT_OK();
+    pathconfig->module_search_path = buf;
+    return _PyStatus_OK();
 }
 
 
-static _PyInitError
+static PyStatus
 calculate_init(PyCalculatePath *calculate,
-               const _PyCoreConfig *core_config)
+               const PyConfig *config)
 {
     size_t len;
     const char *path = getenv("PATH");
@@ -1149,7 +1149,7 @@
     if (!calculate->lib_python) {
         return DECODE_LOCALE_ERR("EXEC_PREFIX define", len);
     }
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
@@ -1164,108 +1164,108 @@
 }
 
 
-static _PyInitError
-calculate_path_impl(const _PyCoreConfig *core_config,
-                    PyCalculatePath *calculate, _PyPathConfig *config)
+static PyStatus
+calculate_path_impl(const PyConfig *config,
+                    PyCalculatePath *calculate, _PyPathConfig *pathconfig)
 {
-    _PyInitError err;
+    PyStatus status;
 
-    err = calculate_program_full_path(core_config, calculate, config);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_program_full_path(config, calculate, pathconfig);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    err = calculate_argv0_path(calculate, config->program_full_path);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_argv0_path(calculate, pathconfig->program_full_path);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    err = calculate_read_pyenv(calculate);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_read_pyenv(calculate);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     wchar_t prefix[MAXPATHLEN+1];
     memset(prefix, 0, sizeof(prefix));
-    err = calculate_prefix(core_config, calculate,
+    status = calculate_prefix(config, calculate,
                            prefix, Py_ARRAY_LENGTH(prefix));
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    err = calculate_zip_path(calculate, prefix);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_zip_path(calculate, prefix);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     wchar_t exec_prefix[MAXPATHLEN+1];
     memset(exec_prefix, 0, sizeof(exec_prefix));
-    err = calculate_exec_prefix(core_config, calculate,
+    status = calculate_exec_prefix(config, calculate,
                                 exec_prefix, Py_ARRAY_LENGTH(exec_prefix));
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     if ((!calculate->prefix_found || !calculate->exec_prefix_found) &&
-        core_config->pathconfig_warnings)
+        config->pathconfig_warnings)
     {
         fprintf(stderr,
                 "Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");
     }
 
-    err = calculate_module_search_path(core_config, calculate,
-                                       prefix, exec_prefix, config);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_module_search_path(config, calculate,
+                                       prefix, exec_prefix, pathconfig);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    err = calculate_reduce_prefix(calculate, prefix, Py_ARRAY_LENGTH(prefix));
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = calculate_reduce_prefix(calculate, prefix, Py_ARRAY_LENGTH(prefix));
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    config->prefix = _PyMem_RawWcsdup(prefix);
-    if (config->prefix == NULL) {
-        return _Py_INIT_NO_MEMORY();
+    pathconfig->prefix = _PyMem_RawWcsdup(prefix);
+    if (pathconfig->prefix == NULL) {
+        return _PyStatus_NO_MEMORY();
     }
 
-    err = calculate_reduce_exec_prefix(calculate,
+    status = calculate_reduce_exec_prefix(calculate,
                                        exec_prefix, Py_ARRAY_LENGTH(exec_prefix));
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    config->exec_prefix = _PyMem_RawWcsdup(exec_prefix);
-    if (config->exec_prefix == NULL) {
-        return _Py_INIT_NO_MEMORY();
+    pathconfig->exec_prefix = _PyMem_RawWcsdup(exec_prefix);
+    if (pathconfig->exec_prefix == NULL) {
+        return _PyStatus_NO_MEMORY();
     }
 
-    return _Py_INIT_OK();
+    return _PyStatus_OK();
 }
 
 
-_PyInitError
-_PyPathConfig_Calculate_impl(_PyPathConfig *config, const _PyCoreConfig *core_config)
+PyStatus
+_PyPathConfig_Calculate(_PyPathConfig *pathconfig, const PyConfig *config)
 {
-    _PyInitError err;
+    PyStatus status;
     PyCalculatePath calculate;
     memset(&calculate, 0, sizeof(calculate));
 
-    err = calculate_init(&calculate, core_config);
-    if (_Py_INIT_FAILED(err)) {
+    status = calculate_init(&calculate, config);
+    if (_PyStatus_EXCEPTION(status)) {
         goto done;
     }
 
-    err = calculate_path_impl(core_config, &calculate, config);
-    if (_Py_INIT_FAILED(err)) {
+    status = calculate_path_impl(config, &calculate, pathconfig);
+    if (_PyStatus_EXCEPTION(status)) {
         goto done;
     }
 
-    err = _Py_INIT_OK();
+    status = _PyStatus_OK();
 
 done:
     calculate_free(&calculate);
-    return err;
+    return status;
 }
 
 #ifdef __cplusplus
diff --git a/Modules/main.c b/Modules/main.c
index 08fb0e0..6b9406f 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -1,7 +1,7 @@
 /* Python interpreter main program */
 
 #include "Python.h"
-#include "pycore_coreconfig.h"
+#include "pycore_initconfig.h"
 #include "pycore_pylifecycle.h"
 #include "pycore_pymem.h"
 #include "pycore_pystate.h"
@@ -33,14 +33,14 @@
 
 /* --- pymain_init() ---------------------------------------------- */
 
-static _PyInitError
+static PyStatus
 pymain_init(const _PyArgv *args)
 {
-    _PyInitError err;
+    PyStatus status;
 
-    err = _PyRuntime_Initialize();
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    status = _PyRuntime_Initialize();
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     /* 754 requires that FP exceptions run in "no stop" mode by default,
@@ -52,29 +52,36 @@
     fedisableexcept(FE_OVERFLOW);
 #endif
 
-    _PyPreConfig preconfig;
-    _PyPreConfig_InitPythonConfig(&preconfig);
-    err = _Py_PreInitializeFromPyArgv(&preconfig, args);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    PyPreConfig preconfig;
+    PyPreConfig_InitPythonConfig(&preconfig);
+    status = _Py_PreInitializeFromPyArgv(&preconfig, args);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
-    _PyCoreConfig config;
-    err = _PyCoreConfig_InitPythonConfig(&config);
-    if (_Py_INIT_FAILED(err)) {
-        return err;
+    PyConfig config;
+    status = PyConfig_InitPythonConfig(&config);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
     }
 
     /* pass NULL as the config: config is read from command line arguments,
        environment variables, configuration files */
     if (args->use_bytes_argv) {
-        return _Py_InitializeFromArgs(&config,
-                                      args->argc, args->bytes_argv);
+        status = PyConfig_SetBytesArgv(&config, args->argc, args->bytes_argv);
     }
     else {
-        return _Py_InitializeFromWideArgs(&config,
-                                          args->argc, args->wchar_argv);
+        status = PyConfig_SetArgv(&config, args->argc, args->wchar_argv);
     }
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
+    }
+
+    status = Py_InitializeFromConfig(&config);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
+    }
+    return _PyStatus_OK();
 }
 
 
@@ -82,13 +89,17 @@
 
 /* Non-zero if filename, command (-c) or module (-m) is set
    on the command line */
-#define RUN_CODE(config) \
-    (config->run_command != NULL || config->run_filename != NULL \
-     || config->run_module != NULL)
+static inline int config_run_code(const PyConfig *config)
+{
+    return (config->run_command != NULL
+            || config->run_filename != NULL
+            || config->run_module != NULL);
+}
+
 
 /* Return non-zero is stdin is a TTY or if -i command line option is used */
 static int
-stdin_is_interactive(const _PyCoreConfig *config)
+stdin_is_interactive(const PyConfig *config)
 {
     return (isatty(fileno(stdin)) || config->interactive);
 }
@@ -181,13 +192,13 @@
 
 
 static void
-pymain_header(const _PyCoreConfig *config)
+pymain_header(const PyConfig *config)
 {
     if (config->quiet) {
         return;
     }
 
-    if (!config->verbose && (RUN_CODE(config) || !stdin_is_interactive(config))) {
+    if (!config->verbose && (config_run_code(config) || !stdin_is_interactive(config))) {
         return;
     }
 
@@ -199,12 +210,12 @@
 
 
 static void
-pymain_import_readline(const _PyCoreConfig *config)
+pymain_import_readline(const PyConfig *config)
 {
     if (config->isolated) {
         return;
     }
-    if (!config->inspect && RUN_CODE(config)) {
+    if (!config->inspect && config_run_code(config)) {
         return;
     }
     if (!isatty(fileno(stdin))) {
@@ -293,7 +304,7 @@
 
 
 static int
-pymain_run_file(_PyCoreConfig *config, PyCompilerFlags *cf)
+pymain_run_file(PyConfig *config, PyCompilerFlags *cf)
 {
     const wchar_t *filename = config->run_filename;
     FILE *fp = _Py_wfopen(filename, L"rb");
@@ -362,7 +373,7 @@
 
 
 static int
-pymain_run_startup(_PyCoreConfig *config, PyCompilerFlags *cf, int *exitcode)
+pymain_run_startup(PyConfig *config, PyCompilerFlags *cf, int *exitcode)
 {
     const char *startup = _Py_GetEnv(config->use_environment, "PYTHONSTARTUP");
     if (startup == NULL) {
@@ -421,7 +432,7 @@
 
 
 static int
-pymain_run_stdin(_PyCoreConfig *config, PyCompilerFlags *cf)
+pymain_run_stdin(PyConfig *config, PyCompilerFlags *cf)
 {
     if (stdin_is_interactive(config)) {
         config->inspect = 0;
@@ -448,7 +459,7 @@
 
 
 static void
-pymain_repl(_PyCoreConfig *config, PyCompilerFlags *cf, int *exitcode)
+pymain_repl(PyConfig *config, PyCompilerFlags *cf, int *exitcode)
 {
     /* Check this environment variable at the end, to give programs the
        opportunity to set it from Python. */
@@ -457,7 +468,7 @@
         Py_InspectFlag = 1;
     }
 
-    if (!(config->inspect && stdin_is_interactive(config) && RUN_CODE(config))) {
+    if (!(config->inspect && stdin_is_interactive(config) && config_run_code(config))) {
         return;
     }
 
@@ -477,7 +488,7 @@
 {
     PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
     /* pymain_run_stdin() modify the config */
-    _PyCoreConfig *config = &interp->core_config;
+    PyConfig *config = &interp->config;
 
     PyObject *main_importer_path = NULL;
     if (config->run_filename != NULL) {
@@ -590,20 +601,20 @@
 
 
 static void _Py_NO_RETURN
-pymain_exit_error(_PyInitError err)
+pymain_exit_error(PyStatus status)
 {
-    if (_Py_INIT_IS_EXIT(err)) {
+    if (_PyStatus_IS_EXIT(status)) {
         /* If it's an error rather than a regular exit, leave Python runtime
-           alive: _Py_ExitInitError() uses the current exception and use
+           alive: Py_ExitStatusException() uses the current exception and use
            sys.stdout in this case. */
         pymain_free();
     }
-    _Py_ExitInitError(err);
+    Py_ExitStatusException(status);
 }
 
 
 int
-_Py_RunMain(void)
+Py_RunMain(void)
 {
     int exitcode = 0;
 
@@ -628,16 +639,16 @@
 static int
 pymain_main(_PyArgv *args)
 {
-    _PyInitError err = pymain_init(args);
-    if (_Py_INIT_IS_EXIT(err)) {
+    PyStatus status = pymain_init(args);
+    if (_PyStatus_IS_EXIT(status)) {
         pymain_free();
-        return err.exitcode;
+        return status.exitcode;
     }
-    if (_Py_INIT_FAILED(err)) {
-        pymain_exit_error(err);
+    if (_PyStatus_EXCEPTION(status)) {
+        pymain_exit_error(status);
     }
 
-    return _Py_RunMain();
+    return Py_RunMain();
 }
 
 
@@ -654,7 +665,7 @@
 
 
 int
-_Py_UnixMain(int argc, char **argv)
+Py_BytesMain(int argc, char **argv)
 {
     _PyArgv args = {
         .argc = argc,