Issue #12546: Allow \x00 as a fill character for builtin type __format__ methods.
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index da176b8..f068ca6 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1463,6 +1463,27 @@
self.assertEqual(u'{0:10000}'.format(u''), u' ' * 10000)
self.assertEqual(u'{0:10000000}'.format(u''), u' ' * 10000000)
+ # issue 12546: use \x00 as a fill character
+ self.assertEqual('{0:\x00<6s}'.format('foo'), 'foo\x00\x00\x00')
+ self.assertEqual('{0:\x01<6s}'.format('foo'), 'foo\x01\x01\x01')
+ self.assertEqual('{0:\x00^6s}'.format('foo'), '\x00foo\x00\x00')
+ self.assertEqual('{0:^6s}'.format('foo'), ' foo ')
+
+ self.assertEqual('{0:\x00<6}'.format(3), '3\x00\x00\x00\x00\x00')
+ self.assertEqual('{0:\x01<6}'.format(3), '3\x01\x01\x01\x01\x01')
+ self.assertEqual('{0:\x00^6}'.format(3), '\x00\x003\x00\x00\x00')
+ self.assertEqual('{0:<6}'.format(3), '3 ')
+
+ self.assertEqual('{0:\x00<6}'.format(3.14), '3.14\x00\x00')
+ self.assertEqual('{0:\x01<6}'.format(3.14), '3.14\x01\x01')
+ self.assertEqual('{0:\x00^6}'.format(3.14), '\x003.14\x00')
+ self.assertEqual('{0:^6}'.format(3.14), ' 3.14 ')
+
+ self.assertEqual('{0:\x00<12}'.format(3+2.0j), '(3+2j)\x00\x00\x00\x00\x00\x00')
+ self.assertEqual('{0:\x01<12}'.format(3+2.0j), '(3+2j)\x01\x01\x01\x01\x01\x01')
+ self.assertEqual('{0:\x00^12}'.format(3+2.0j), '\x00\x00\x00(3+2j)\x00\x00\x00')
+ self.assertEqual('{0:^12}'.format(3+2.0j), ' (3+2j) ')
+
# format specifiers for user defined type
self.assertEqual(u'{0:abc}'.format(C()), u'abc')