# HG changeset patch
# Parent f6b3ad30185172823f81592cf48d928f9c286085

diff -r f6b3ad301851 Doc/library/functions.rst
--- a/Doc/library/functions.rst	Mon Oct 17 11:36:49 2011 +1100
+++ b/Doc/library/functions.rst	Mon Oct 17 15:24:57 2011 +0100
@@ -1035,7 +1035,9 @@
    This is a versatile function to create iterables yielding arithmetic
    progressions.  It is most often used in :keyword:`for` loops.  The arguments
    must be integers.  If the *step* argument is omitted, it defaults to ``1``.
-   If the *start* argument is omitted, it defaults to ``0``.  The full form
+   If the *start* argument is omitted, it defaults to ``0``.  The returned range
+   object provides the read-only data attributes :attr:`start`, :attr:`stop`
+   and :attr:`step` to access the arguments (or their defaults).  The full form
    returns an iterable of integers ``[start, start + step, start + 2 * step,
    ...]``.  If *step* is positive, the last element is the largest ``start + i *
    step`` less than *stop*; if *step* is negative, the last element is the
diff -r f6b3ad301851 Lib/test/test_range.py
--- a/Lib/test/test_range.py	Mon Oct 17 11:36:49 2011 +1100
+++ b/Lib/test/test_range.py	Mon Oct 17 15:24:57 2011 +0100
@@ -339,6 +339,15 @@
         self.assertEqual(repr(range(1, 2)), 'range(1, 2)')
         self.assertEqual(repr(range(1, 2, 3)), 'range(1, 2, 3)')
 
+    def test_attributes(self):
+        for i in range(3):
+            for j in range(3):
+                for k in range(1, 3):
+                    r = range(i, j, k)
+                    self.assertEqual(r.start, i)
+                    self.assertEqual(r.stop, j)
+                    self.assertEqual(r.step, k)
+
     def test_pickling(self):
         testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1),
                      (13, 21, 3), (-2, 2, 2)]
diff -r f6b3ad301851 Misc/ACKS
--- a/Misc/ACKS	Mon Oct 17 11:36:49 2011 +1100
+++ b/Misc/ACKS	Mon Oct 17 15:24:57 2011 +0100
@@ -612,6 +612,7 @@
 Vladimir Marangozov
 David Marek
 Doug Marien
+Sven Marnach
 Alex Martelli
 Anthony Martin
 Owen Martin
diff -r f6b3ad301851 Objects/rangeobject.c
--- a/Objects/rangeobject.c	Mon Oct 17 11:36:49 2011 +1100
+++ b/Objects/rangeobject.c	Mon Oct 17 15:24:57 2011 +0100
@@ -1,6 +1,7 @@
 /* Range object implementation */
 
 #include "Python.h"
+#include "structmember.h"
 
 /* Support objects whose length is > PY_SSIZE_T_MAX.
 
@@ -722,6 +723,13 @@
 }
 
 
+static PyMemberDef range_members[] = {
+    {"start", T_OBJECT, offsetof(rangeobject, start), READONLY},
+    {"stop", T_OBJECT, offsetof(rangeobject, stop), READONLY},
+    {"step", T_OBJECT, offsetof(rangeobject, step), READONLY},
+    {0}
+};
+
 static PyMappingMethods range_as_mapping = {
         (lenfunc)range_length,       /* mp_length */
         (binaryfunc)range_subscript, /* mp_subscript */
@@ -778,7 +786,7 @@
         range_iter,             /* tp_iter */
         0,                      /* tp_iternext */
         range_methods,          /* tp_methods */
-        0,                      /* tp_members */
+        range_members,          /* tp_members */
         0,                      /* tp_getset */
         0,                      /* tp_base */
         0,                      /* tp_dict */