py: Improve range: add len, subscr, proper print.

Can now index ranges with integers and slices, and reverse ranges
(although reversing is not very efficient).

Not sure how useful this stuff is, but gets us closer to having all of
Python's builtins.

2 files changed, 28 insertions, 2 deletions

diff --git a/tests/basics/builtin_range.py b/tests/basics/builtin_range.py
new file mode 100644
index 000000000..0c0110c26
--- /dev/null
+++ b/tests/basics/builtin_range.py
@@ -0,0 +1,26 @@
+# test builtin range type
+
+# print
+print(range(4))
+
+# len
+print(len(range(0)))
+print(len(range(4)))
+print(len(range(1, 4)))
+print(len(range(1, 4, 2)))
+print(len(range(1, 4, -1)))
+print(len(range(4, 1, -1)))
+print(len(range(4, 1, -2)))
+
+# subscr
+print(range(4)[0])
+print(range(4)[1])
+print(range(4)[-1])
+
+# slice
+print(range(4)[0:])
+print(range(4)[1:])
+print(range(4)[1:2])
+print(range(4)[1:3])
+print(range(4)[1::2])
+print(range(4)[1:-2:2])
diff --git a/tests/basics/builtin_reversed.py b/tests/basics/builtin_reversed.py
index c834cba69..58631d544 100644
--- a/tests/basics/builtin_reversed.py
+++ b/tests/basics/builtin_reversed.py
@@ -18,8 +18,8 @@ for b in reversed(b'1234'):
     print(b)
 
 # range
-#for i in reversed(range(3)):
-#    print(i)
+for i in reversed(range(3)):
+    print(i)
 
 # user object
 class A: