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objrange: Match cpython range slicing.

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The "index fixing" behavior of get_fast_slice_indexes are not
desired here; the underlying behavior of mp_obj_slice_indexes
actually is.

Closes: #17016

Signed-off-by: Jeff Epler <jepler@gmail.com>
This commit is contained in:
Jeff Epler 2025-03-27 21:29:01 -05:00
parent 61119259c3
commit 9db9d966b0
1 changed files with 1 additions and 5 deletions
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6
py/objrange.c
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@ -164,15 +164,11 @@ static mp_obj_t range_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
#if MICROPY_PY_BUILTINS_SLICE
if (mp_obj_is_type(index, &mp_type_slice)) {
mp_bound_slice_t slice;
mp_seq_get_fast_slice_indexes(len, index, &slice);
mp_obj_slice_indices(index, len, &slice);
mp_obj_range_t *o = mp_obj_malloc(mp_obj_range_t, &mp_type_range);
o->start = self->start + slice.start * self->step;
o->stop = self->start + slice.stop * self->step;
o->step = slice.step * self->step;
if (slice.step < 0) {
// Negative slice steps have inclusive stop, so adjust for exclusive
o->stop -= self->step;
}
return MP_OBJ_FROM_PTR(o);
}
#endif