add introspection to range objects (closes #9896)
Patch by Daniel Urban.
diff --git a/Lib/test/test_range.py b/Lib/test/test_range.py
index 6035e76..2e335cc 100644
--- a/Lib/test/test_range.py
+++ b/Lib/test/test_range.py
@@ -560,6 +560,35 @@
range(0) >= range(0)
+ def test_attributes(self):
+ # test the start, stop and step attributes of range objects
+ self.assert_attrs(range(0), 0, 0, 1)
+ self.assert_attrs(range(10), 0, 10, 1)
+ self.assert_attrs(range(-10), 0, -10, 1)
+ self.assert_attrs(range(0, 10, 1), 0, 10, 1)
+ self.assert_attrs(range(0, 10, 3), 0, 10, 3)
+ self.assert_attrs(range(10, 0, -1), 10, 0, -1)
+ self.assert_attrs(range(10, 0, -3), 10, 0, -3)
+
+ def assert_attrs(self, rangeobj, start, stop, step):
+ self.assertEqual(rangeobj.start, start)
+ self.assertEqual(rangeobj.stop, stop)
+ self.assertEqual(rangeobj.step, step)
+
+ with self.assertRaises(AttributeError):
+ rangeobj.start = 0
+ with self.assertRaises(AttributeError):
+ rangeobj.stop = 10
+ with self.assertRaises(AttributeError):
+ rangeobj.step = 1
+
+ with self.assertRaises(AttributeError):
+ del rangeobj.start
+ with self.assertRaises(AttributeError):
+ del rangeobj.stop
+ with self.assertRaises(AttributeError):
+ del rangeobj.step
+
def test_main():
test.support.run_unittest(RangeTest)