Addresses issue 2802: 'n' formatting for integers. Adds 'n' as a format specifier for integers, to mirror the same specifier which is already available for floats. 'n' is the same as 'd', but inserts the current locale-specific thousands grouping. I added this as a stringlib function, but it's only used by str type, not unicode. This is because of an implementation detail in unicode.format(), which does its own str->unicode conversion. But the unicode version will be needed in 3.0, and it may be needed by other code eventually in 2.6 (maybe decimal?), so I left it as a stringlib implementation. As long as the unicode version isn't instantiated, there's no overhead for this.

--- a/Objects/stringlib/stringdefs.h	Sun May 11 19:39:48 2008 +0000
+++ b/Objects/stringlib/stringdefs.h	Sun May 11 19:52:48 2008 +0000
@@ -23,5 +23,6 @@
 #define STRINGLIB_CHECK          PyString_Check
 #define STRINGLIB_CMP            memcmp
 #define STRINGLIB_TOSTR          PyObject_Str
+#define STRINGLIB_GROUPING       _PyString_InsertThousandsGrouping
 
 #endif /* !STRINGLIB_STRINGDEFS_H */