py: Implement builtin reversed() function.
reversed function now implemented, and works for tuple, list, str, bytes
and user objects with __len__ and __getitem__.
Renamed mp_builtin_len to mp_obj_len to make it publically available (eg
for reversed).
diff --git a/py/obj.c b/py/obj.c
index 0471645..d8fccfb 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -360,6 +360,16 @@
return i;
}
+// will raise a TypeError if object has no length
+mp_obj_t mp_obj_len(mp_obj_t o_in) {
+ mp_obj_t len = mp_obj_len_maybe(o_in);
+ if (len == MP_OBJ_NULL) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "object of type '%s' has no len()", mp_obj_get_type_str(o_in)));
+ } else {
+ return len;
+ }
+}
+
// may return MP_OBJ_NULL
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
if (