Summary

The class variable _fields_ on ctypes Structure objects, e.g.

class mount_attr(ctypes.Structure):
    _fields_ = [
        ("attr_set", ctypes.c_uint64),
        ("attr_clr", ctypes.c_uint64),
        ("propagation", ctypes.c_uint64),
        ("userns_fd", ctypes.c_uint64),
    ]

will trigger RUF012, but documentation says

The fields class variable can only be set once. Later assignments will raise an AttributeError.

so an exception to this rule would be helpful.