Bug #1379994: Fix *unicode_escape codecs to encode r'\' as r'\\'

just like string codecs.

Lib/test/test_unicode.py

@@ -615,20 +615,24 @@ class UnicodeTest(
         self.assertEqual(u'hello'.encode('latin-1'), 'hello')
 
         # Roundtrip safety for BMP (just the first 1024 chars)
-        u = u''.join(map(unichr, xrange(1024)))
-        for encoding in ('utf-7', 'utf-8', 'utf-16', 'utf-16-le', 'utf-16-be',
-                         'raw_unicode_escape', 'unicode_escape', 'unicode_internal'):
-            self.assertEqual(unicode(u.encode(encoding),encoding), u)
+        for c in xrange(1024):
+            u = unichr(c)
+            for encoding in ('utf-7', 'utf-8', 'utf-16', 'utf-16-le',
+                             'utf-16-be', 'raw_unicode_escape',
+                             'unicode_escape', 'unicode_internal'):
+                self.assertEqual(unicode(u.encode(encoding),encoding), u)
 
         # Roundtrip safety for BMP (just the first 256 chars)
-        u = u''.join(map(unichr, xrange(256)))
-        for encoding in ('latin-1',):
-            self.assertEqual(unicode(u.encode(encoding),encoding), u)
+        for c in xrange(256):
+            u = unichr(c)
+            for encoding in ('latin-1',):
+                self.assertEqual(unicode(u.encode(encoding),encoding), u)
 
         # Roundtrip safety for BMP (just the first 128 chars)
-        u = u''.join(map(unichr, xrange(128)))
-        for encoding in ('ascii',):
-            self.assertEqual(unicode(u.encode(encoding),encoding), u)
+        for c in xrange(128):
+            u = unichr(c)
+            for encoding in ('ascii',):
+                self.assertEqual(unicode(u.encode(encoding),encoding), u)
 
         # Roundtrip safety for non-BMP (just a few chars)
         u = u'\U00010001\U00020002\U00030003\U00040004\U00050005'

Misc/NEWS

@@ -12,6 +12,9 @@ What's New in Python 2.5 alpha 1?
 Core and builtins
 -----------------
 
+- Bug #1379994: Builtin unicode_escape and raw_unicode_escape codec
+  now encodes backslash correctly.
+
 - Patch #1350409: Work around signal handling bug in Visual Studio 2005.
 
 - Bug #1281408: Py_BuildValue now works correct even with unsigned longs

Objects/unicodeobject.c

@@ -1989,9 +1989,9 @@ PyObject *unicodeescape_string(const Py_UNICODE *s,
     while (size-- > 0) {
         Py_UNICODE ch = *s++;
 
-        /* Escape quotes */
-        if (quotes &&
-	    (ch == (Py_UNICODE) PyString_AS_STRING(repr)[1] || ch == '\\')) {
+        /* Escape quotes and backslashes */
+        if ((quotes &&
+	     ch == (Py_UNICODE) PyString_AS_STRING(repr)[1]) || ch == '\\') {
             *p++ = '\\';
             *p++ = (char) ch;
 	    continue;