objdict: Implement __getitem__ method.

py/objdict.c

@@ -123,6 +123,12 @@ STATIC bool dict_store_item(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
     return true;
 }
 
+STATIC mp_obj_t dict_getitem(mp_obj_t lhs_in, mp_obj_t rhs_in) {
+    return dict_binary_op(MP_BINARY_OP_SUBSCR, lhs_in, rhs_in);
+}
+
+STATIC MP_DEFINE_CONST_FUN_OBJ_2(dict_getitem_obj, dict_getitem);
+
 /******************************************************************************/
 /* dict iterator                                                              */
 
@@ -481,6 +487,7 @@ STATIC const mp_map_elem_t dict_locals_dict_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_setdefault), (mp_obj_t)&dict_setdefault_obj },
     { MP_OBJ_NEW_QSTR(MP_QSTR_update), (mp_obj_t)&dict_update_obj },
     { MP_OBJ_NEW_QSTR(MP_QSTR_values), (mp_obj_t)&dict_values_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR___getitem__), (mp_obj_t)&dict_getitem_obj },
 };
 
 STATIC MP_DEFINE_CONST_DICT(dict_locals_dict, dict_locals_dict_table);

tests/basics/dict2.py

@@ -12,3 +12,5 @@ print(d['1'], d['2'], d['3'])
 d2 = dict(d)
 print('2' in d2)
 print(id(d) != id(d2), d == d2)
+
+print(d.__getitem__('2'))