eryk sun wrote: > On Thu, Dec 29, 2016 at 12:18 PM, Hans-Peter Jansen <h...@urpla.net> wrote: >>> >>> import weakref, ctypes >>> >>> T = ctypes.c_ubyte * 3 >>> >>> t = T() >>> >>> bytes(t) == b"\0" * 3 >>> >>> True >>> >>> >>> bytes(weakref.proxy(t)) == b"\0" * 3 >>> >>> Traceback (most recent call last): >>> File "<stdin>", line 1, in <module> >>> AttributeError: 'c_ubyte_Array_3' object has no attribute '__bytes__' >>> >>> That looks like a leaky abstraction. While I found a workaround >>> >>> >>> bytes(weakref.proxy(t)[:]) == b"\0" * 3 >>> >>> True >> >> I found a couple of other rough corners already, when working with the >> ctypes module. Obviously, this module is lacking some love. > > That's not the fault of ctypes.
By adding a Structure.close() method that would release the underlying memoryview reference and make all further attribute access fail ctypes could support Hans-Peter's use case quite easily. In that sense I think it is the "fault" or rather a limitation of ctypes. I'm not sure though whether ctypes is the right tool here in the first place. Anyway, as long as he gets enough advantages from his current approach a few odd del statements might be OK. -- https://mail.python.org/mailman/listinfo/python-list
