Do ne sys module flags underscored

Author: Alexpux

Lib/ntpath.py

@@ -20,7 +20,7 @@
 import genericpath
 from genericpath import *
 
-if sys.use_alt_sep:
+if sys._use_alt_sep:
     sep = '/'
     altsep = '\\'
 else:

Python/sysmodule.c

@@ -3163,13 +3163,13 @@ hash_info -- a named tuple with information about the hash algorithm.\n\
 hexversion -- version information encoded as a single integer\n\
 implementation -- Python implementation information.\n\
 int_info -- a named tuple with information about the int implementation.\n\
-is_mingw -- integer value if Python builded with mingw-w64 toolchain\n\
+_is_mingw -- integer value if Python builded with mingw-w64 toolchain\n\
 maxsize -- the largest supported length of containers.\n\
 maxunicode -- the value of the largest Unicode code point\n\
 platform -- platform identifier\n\
 prefix -- prefix used to find the Python library\n\
 thread_info -- a named tuple with information about the thread implementation.\n\
-use_alt_sep -- indicate if need use posix style path setparator for path normalize\n\
+_use_alt_sep -- indicate if need use posix style path setparator for path normalize\n\
 version -- the version of this interpreter as a string\n\
 version_info -- version information as a named tuple\n\
 "
@@ -3647,8 +3647,8 @@ _PySys_InitCore(PyThreadState *tstate, PyObject *sysdict)
     SET_SYS_FROM_STRING("byteorder", "little");
 #endif
 
-    SET_SYS("is_mingw", PyLong_FromLong(is_mingw_platform()));
-    SET_SYS("use_alt_sep", PyLong_FromLong(use_alt_sep()));
+    SET_SYS("_is_mingw", PyLong_FromLong(is_mingw_platform()));
+    SET_SYS("_use_alt_sep", PyLong_FromLong(use_alt_sep()));
 
 #if defined(MS_WINDOWS) && defined(Py_ENABLE_SHARED)
     SET_SYS("dllhandle", PyLong_FromVoidPtr(PyWin_DLLhModule));

mingw_smoketests.py

@@ -30,7 +30,7 @@
 import unittest
 import sysconfig
 
-if sys.use_alt_sep:
+if sys._use_alt_sep:
     SEP = "/"
 else:
     SEP = "\\"