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-rw-r--r--py/runtime.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/py/runtime.c b/py/runtime.c
index f43e804b40..b2d9c7e960 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -461,6 +461,18 @@ mp_obj_t rt_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
// then fail
// note that list does not implement + or +=, so that inplace_concat is reached first for +=
+ // deal with is, is not
+ if (op == RT_COMPARE_OP_IS) {
+ // TODO: may need to handle strings specially, CPython appears to
+ // assume all strings are interned (so "is" == "==" for strings)
+ return MP_BOOL(lhs == rhs);
+ }
+ if (op == RT_COMPARE_OP_IS_NOT) {
+ // TODO: may need to handle strings specially, CPython appears to
+ // assume all strings are interned (so "is" == "==" for strings)
+ return MP_BOOL(lhs != rhs);
+ }
+
// deal with == and != for all types
if (op == RT_COMPARE_OP_EQUAL || op == RT_COMPARE_OP_NOT_EQUAL) {
if (mp_obj_equal(lhs, rhs)) {