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Hi, haypo, Your patch seems cannot be applied cleanly on current py3k trunk. And after modified your patch, test_unicode.py runs into Segmentation fault. Is there something wrong or some changes which could influence this bug had been already made since the patch is worked out?
On the current trunk, I guess the bug could be fixed in a simpler way:
In step 1, before check '%%', check '%'(a string ends with '%') first. Then check '%%' and skip it.
The whole patch:
Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(revision 88453)
+++ Objects/unicodeobject.c	(working copy)
@@ -750,8 +750,12 @@
 * result in an array) */
 for (f = format; *f; f++) {
 if (*f == '%') {
- if (*(f+1)=='%')
+ if (*(f+1)=='0円')
+ continue;
+ if (*(f+1)=='%') {
+ f++;
 continue;
+ }
 if (*(f+1)=='S' || *(f+1)=='R' || *(f+1)=='A')
 ++callcount;
 while (Py_ISDIGIT((unsigned)*f))
After applying this small patch and tests in your patch, test_unicode.py can passed.