Issue #13706: Fix format(int, "n") for locale with non-ASCII thousands separator

 * Decode thousands separator and decimal point using PyUnicode_DecodeLocale()
   (from the locale encoding), instead of decoding them implicitly from latin1
 * Remove _PyUnicode_InsertThousandsGroupingLocale(), it was not used
 * Change _PyUnicode_InsertThousandsGrouping() API to return the maximum
   character if unicode is NULL
 * Replace MIN/MAX macros by Py_MIN/Py_MAX
 * stringlib/undef.h undefines STRINGLIB_IS_UNICODE
 * stringlib/localeutil.h only supports Unicode

1 files changed, 15 insertions, 0 deletions

diff --git a/Lib/test/test_format.py b/Lib/test/test_format.py
index 7345b30..70e748f 100644
--- a/Lib/test/test_format.py
+++ b/Lib/test/test_format.py
@@ -1,4 +1,5 @@
 from test.support import verbose, TestFailed
+import locale
 import sys
 import test.support as support
 import unittest
@@ -282,6 +283,20 @@ class FormatTest(unittest.TestCase):
         self.assertEqual(format(1+2j, "\u2007^8"), "\u2007(1+2j)\u2007")
         self.assertEqual(format(0j, "\u2007^4"), "\u20070j\u2007")
 
+    def test_locale(self):
+        try:
+            oldloc = locale.setlocale(locale.LC_ALL, '')
+        except locale.Error as err:
+            self.skipTest("Cannot set locale: {}".format(err))
+        try:
+            sep = locale.localeconv()['thousands_sep']
+            text = format(123456789, "n")
+            self.assertIn(sep, text)
+            self.assertEqual(text.replace(sep, ''), '123456789')
+        finally:
+            locale.setlocale(locale.LC_ALL, oldloc)
+
+
 
 def test_main():
     support.run_unittest(FormatTest)