@@ -8,6 +8,7 @@ from typing import TYPE_CHECKING, Optional, Union, cast
from . import _ext
from ._internal import poll_fd
from .exception import RequestReleasedError
+from .line import Value
from .line_settings import LineSettings, _line_settings_to_ext
if TYPE_CHECKING:
@@ -16,7 +17,6 @@ if TYPE_CHECKING:
from types import TracebackType
from .edge_event import EdgeEvent
- from .line import Value
__all__ = ["LineRequest"]
@@ -124,7 +124,7 @@ class LineRequest:
offsets = [self._line_to_offset(line) for line in lines]
- buf = [None] * len(lines)
+ buf = cast(list[Value], [None] * len(offsets))
cast(_ext.Request, self._req).get_values(offsets, buf)
return buf
The `values` argument of `_ext.Request.get_values` uses a preallocated `list[None]` as a buffer that is populated with `Value`s by the external module that are then returned from the function. Use `cast` to inform the type checker it's a `list[Value]` despite how it's allocated. Also, as `lines` is typed as an `Iterable`, there is no guarantee it has a `__len__` method. Instead, use the size of the `offsets` array to allocate the buffer. Signed-off-by: Vincent Fazio <vfazio@xes-inc.com> --- bindings/python/gpiod/line_request.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)