py/objtuple: Properly implement comparison with incompatible types.

Paul Sokolovsky · Paul Sokolovsky · commit 1aaba5cabe48 · 2017-09-06T00:23:41.000+03:00
Should raise TypeError, unless it's (in)equality comparison.
diff --git a/py/objtuple.c b/py/objtuple.c
@@ -101,7 +101,7 @@ STATIC mp_obj_t mp_obj_tuple_make_new(const mp_obj_type_t *type_in, size_t n_arg
 }
 
 // Don't pass MP_BINARY_OP_NOT_EQUAL here
-STATIC bool tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
+STATIC mp_obj_t tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
     // type check is done on getiter method to allow tuple, namedtuple, attrtuple
     mp_check_self(mp_obj_get_type(self_in)->getiter == mp_obj_tuple_getiter);
     mp_obj_type_t *another_type = mp_obj_get_type(another_in);
@@ -110,12 +110,15 @@ STATIC bool tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in
         // Slow path for user subclasses
         another_in = mp_instance_cast_to_native_base(another_in, MP_OBJ_FROM_PTR(&mp_type_tuple));
         if (another_in == MP_OBJ_NULL) {
-            return false;
+            if (op == MP_BINARY_OP_EQUAL) {
+                return mp_const_false;
+            }
+            return MP_OBJ_NULL;
         }
     }
     mp_obj_tuple_t *another = MP_OBJ_TO_PTR(another_in);
 
-    return mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len);
+    return mp_obj_new_bool(mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len));
 }
 
 mp_obj_t mp_obj_tuple_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
@@ -166,7 +169,7 @@ mp_obj_t mp_obj_tuple_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) {
         case MP_BINARY_OP_LESS_EQUAL:
         case MP_BINARY_OP_MORE:
         case MP_BINARY_OP_MORE_EQUAL:
-            return mp_obj_new_bool(tuple_cmp_helper(op, lhs, rhs));
+            return tuple_cmp_helper(op, lhs, rhs);
 
         default:
             return MP_OBJ_NULL; // op not supported
diff --git a/tests/basics/tuple_compare.py b/tests/basics/tuple_compare.py
@@ -53,3 +53,13 @@
 print((10, 0) < (1, 1))
 print((0, 0, 10, 0) > (0, 0, 1, 1))
 print((0, 0, 10, 0) < (0, 0, 1, 1))
+
+
+print(() == {})
+print(() != {})
+print((1,) == [1])
+
+try:
+    print(() < {})
+except TypeError:
+    print("TypeError")
