1 files changed, 16 insertions, 0 deletions
diff --git a/py/objdict.c b/py/objdict.c
index 6dbb1f316b..e164ed74ca 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -57,6 +57,12 @@ static mp_obj_t dict_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
                 return elem->value;
             }
         }
+        case RT_COMPARE_OP_IN:
+        case RT_COMPARE_OP_NOT_IN:
+        {
+            mp_map_elem_t *elem = mp_map_lookup(&o->map, rhs_in, MP_MAP_LOOKUP);
+            return MP_BOOL((op == RT_COMPARE_OP_IN) ^ (elem == NULL));
+        }
         default:
             // op not supported
             return NULL;
@@ -362,10 +368,20 @@ static void dict_view_print(void (*print)(void *env, const char *fmt, ...), void
     print(env, "])");
 }
 
+static mp_obj_t dict_view_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
+    /* only supported for the 'keys' kind until sets and dicts are refactored */
+    mp_obj_dict_view_t *o = lhs_in;
+    if (o->kind != MP_DICT_VIEW_KEYS) return NULL;
+    if (op != RT_COMPARE_OP_IN && op != RT_COMPARE_OP_NOT_IN) return NULL;
+    return dict_binary_op(op, o->dict, rhs_in);
+}
+
+
 static const mp_obj_type_t dict_view_type = {
     { &mp_const_type },
     "dict_view",
     .print = dict_view_print,
+    .binary_op = dict_view_binary_op,
     .getiter = dict_view_getiter,
 };