Reset old locale after running tests. Not doing so broke

test_format/test_unicode in some circumstances (patch #1007539/bug #992078).

Lib/test/test__locale.py

@@ -13,8 +13,10 @@ candidate_locales = ['es_UY', 'fr_FR', 'fi_FI', 'es_CO', 'pt_PT', 'it_IT',
     'eu_ES', 'vi_VN', 'af_ZA', 'nb_NO', 'en_DK', 'tg_TJ',
     'es_ES.ISO8859-1', 'fr_FR.ISO8859-15', 'ru_RU.KOI8-R', 'ko_KR.eucKR']
 
-saw_locale = 0
-for loc in candidate_locales:
+oldlocale = setlocale(LC_NUMERIC)
+try:
+    saw_locale = 0
+    for loc in candidate_locales:
         try:
             setlocale(LC_NUMERIC, loc)
         except Error:
@@ -30,5 +32,7 @@ for loc in candidate_locales:
         li_radixchar = localeconv()['thousands_sep']
         if nl_radixchar != li_radixchar:
             print "%r != %r" % (nl_radixchar, li_radixchar)
-if not saw_locale:
+    if not saw_locale:
             raise ImportError, "None of the listed locales found"
+finally:
+    setlocale(LC_NUMERIC, oldlocale)