Bug report
Currently the method for defining Structure fields that cannot be defined within the class, is to define the class with pass and then set _fields_ outside. But ctypes.Structure incorrectly raises AttributeError, even when no class has ever set a _fields_.
from ctypes import *
class PyObject(Structure):
pass
class PyVarObject(PyObject):
pass
class PyTypeObject(PyVarObject):
pass
PyObject._fields_ = [
("ob_refcnt", c_long),
("ob_type", POINTER(PyTypeObject)),
] PyObject._fields_ = [
^^^^^^^^^^^^^^^^^
AttributeError: _fields_ is finalStrangely, suppressing this Attribute error reveals the _fields_ attribute does actually get set?
with suppress(AttributeError):
PyObject._fields_ = [
("ob_refcnt", c_long),
("ob_type", POINTER(PyTypeObject)),
]
print(PyObject._fields_)
>> [('ob_refcnt', <class 'ctypes.c_long'>), ('ob_type', <class '__main__.LP_PyTypeObject'>)]Your environment
- CPython versions tested on: 3.11.1, main
- Operating system and architecture: macOS ARM, ubuntu x64
Linked PRs
Bug report
Currently the method for defining Structure fields that cannot be defined within the class, is to define the class with
passand then set_fields_outside. Butctypes.Structureincorrectly raisesAttributeError, even when no class has ever set a_fields_.Strangely, suppressing this Attribute error reveals the
_fields_attribute does actually get set?Your environment
Linked PRs