diff options
Diffstat (limited to 'py/runtime.c')
| -rw-r--r-- | py/runtime.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/py/runtime.c b/py/runtime.c index 58b5a5dd13..c9a56f635b 100644 --- a/py/runtime.c +++ b/py/runtime.c @@ -184,7 +184,10 @@ void mp_delete_global(qstr qst) { mp_obj_t mp_unary_op(mp_uint_t op, mp_obj_t arg) { DEBUG_OP_printf("unary " UINT_FMT " %p\n", op, arg); - if (MP_OBJ_IS_SMALL_INT(arg)) { + if (op == MP_UNARY_OP_NOT) { + // "not x" is the negative of whether "x" is true per Python semantics + return mp_obj_new_bool(mp_obj_is_true(arg) == 0); + } else if (MP_OBJ_IS_SMALL_INT(arg)) { mp_int_t val = MP_OBJ_SMALL_INT_VALUE(arg); switch (op) { case MP_UNARY_OP_BOOL: |