diff -ur Python-3.0a4-orig/Objects/unicodeobject.c Python-3.0a4/Objects/unicodeobject.c
--- Python-3.0a4-orig/Objects/unicodeobject.c	2008-04-14 15:14:55.671875000 +0900
+++ Python-3.0a4/Objects/unicodeobject.c	2008-04-14 17:21:20.453125000 +0900
@@ -7512,61 +7512,9 @@
             continue;
         }
 
-#ifdef Py_UNICODE_WIDE
-        /* Map 21-bit characters to '\U00xxxxxx' */
-        else if (ch >= 0x10000) {
-            *p++ = '\\';
-            *p++ = 'U';
-            *p++ = hexdigits[(ch >> 28) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 24) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 20) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 16) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 12) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 8) & 0x0000000F];
-            *p++ = hexdigits[(ch >> 4) & 0x0000000F];
-            *p++ = hexdigits[ch & 0x0000000F];
-	    continue;
-        }
-#else
-	/* Map UTF-16 surrogate pairs to '\U00xxxxxx' */
-	else if (ch >= 0xD800 && ch < 0xDC00) {
-	    Py_UNICODE ch2;
-	    Py_UCS4 ucs;
-
-	    ch2 = *s++;
-	    size--;
-	    if (ch2 >= 0xDC00 && ch2 <= 0xDFFF) {
-		ucs = (((ch & 0x03FF) << 10) | (ch2 & 0x03FF)) + 0x00010000;
-		*p++ = '\\';
-		*p++ = 'U';
-		*p++ = hexdigits[(ucs >> 28) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 24) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 20) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 16) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 12) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 8) & 0x0000000F];
-		*p++ = hexdigits[(ucs >> 4) & 0x0000000F];
-		*p++ = hexdigits[ucs & 0x0000000F];
-		continue;
-	    }
-	    /* Fall through: isolated surrogates are copied as-is */
-	    s--;
-	    size++;
-	}
-#endif
-
-        /* Map 16-bit characters to '\uxxxx' */
-        if (ch >= 256) {
-            *p++ = '\\';
-            *p++ = 'u';
-            *p++ = hexdigits[(ch >> 12) & 0x000F];
-            *p++ = hexdigits[(ch >> 8) & 0x000F];
-            *p++ = hexdigits[(ch >> 4) & 0x000F];
-            *p++ = hexdigits[ch & 0x000F];
-        }
 
         /* Map special whitespace to '\t', \n', '\r' */
-        else if (ch == '\t') {
+        if (ch == '\t') {
             *p++ = '\\';
             *p++ = 't';
         }
@@ -7580,7 +7528,7 @@
         }
 
         /* Map non-printable US ASCII to '\xhh' */
-        else if (ch < ' ' || ch >= 0x7F) {
+        else if (ch < ' ' || ch == 0x7F) {
             *p++ = '\\';
             *p++ = 'x';
             *p++ = hexdigits[(ch >> 4) & 0x000F];
@@ -7589,7 +7537,7 @@
 
         /* Copy everything else as-is */
         else
-            *p++ = (char) ch;
+            *p++ = ch;
     }
     /* Add quote */
     *p++ = PyUnicode_AS_UNICODE(repr)[0];
diff -ur Python-3.0a4-orig/Python/pythonrun.c Python-3.0a4/Python/pythonrun.c
--- Python-3.0a4-orig/Python/pythonrun.c	2008-03-27 08:25:24.000000000 +0900
+++ Python-3.0a4/Python/pythonrun.c	2008-04-14 17:34:35.781250000 +0900
@@ -798,7 +798,7 @@
 #endif
 	}
 	else {
-		if (!(std = PyFile_FromFd(fd, "<stdout>", "w", -1, NULL, NULL,
+		if (!(std = PyFile_FromFd(fd, "<stdout>", "w", -1, NULL, "backslashreplace",
 					  "\n", 0))) {
 			goto error;
 		}
@@ -819,7 +819,7 @@
 #endif
 	}
 	else {
-		if (!(std = PyFile_FromFd(fd, "<stderr>", "w", -1, NULL, NULL,
+		if (!(std = PyFile_FromFd(fd, "<stderr>", "w", -1, NULL, "backslashreplace",
 					  "\n", 0))) {
 			goto error;
 		}