#2630: Implement PEP 3138.
The repr() of a string now contains printable Unicode characters unescaped.
The new ascii() builtin can be used to get a repr() with only ASCII characters in it.

PEP and patch were written by Atsuo Ishimoto.
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index a5c3a81..668a530 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -229,8 +229,9 @@
 value to a string before calling :meth:`__format__`, the normal formatting logic
 is bypassed.
 
-Two conversion flags are currently supported: ``'!s'`` which calls :func:`str`
-on the value, and ``'!r'`` which calls :func:`repr`.
+Three conversion flags are currently supported: ``'!s'`` which calls :func:`str`
+on the value, ``'!r'`` which calls :func:`repr` and ``'!a'`` which calls
+:func:`ascii`.
 
 Some examples::