I love you PJE! Thank you! =) On 6/28/07, Phillip J. Eby <[EMAIL PROTECTED]> wrote: > At 05:23 PM 6/28/2007 +0100, tav wrote: > >Any pointers on removing members via ctypes front? > > > >Whilst I can understand even the most obscure aspects of your python > >code fine, I'm not familiar with C/ctypes... > > What you want is to get access to the type's real dictionary, not the > proxy. Then you can just delete '__subclasses__' from the dictionary > using Python code. Here's some code that does the trick: > > from ctypes import pythonapi, POINTER, py_object > > getdict = pythonapi._PyObject_GetDictPtr > getdict.restype = POINTER(py_object) > getdict.argtypes = [py_object] > > def dictionary_of(ob): > dptr = getdict(ob) > if dptr and dptr.contents: > return dptr.contents.value > > 'dictionary_of' returns either a dictionary object, or None if the > object has no dictionary. You can then simply delete any unwanted > contents. However, you should *never use this* to assign __special__ > methods, as Python will not change the type slots correctly. Heck, > you should probably never use this, period. :) Usage example: > > print "before", type.__subclasses__ > del dictionary_of(type)['__subclasses__'] > print "after", type.__subclasses__ > > This will print something like: > > before <method '__subclasses__' of 'type' objects> > after > Traceback (most recent call last): > File "ctypes_dicto.py", line 14, in <module> > print "after", type.__subclasses__ > AttributeError: type object 'type' has no attribute '__subclasses__' > > et voila. > > You should also be able to delete unwanted function type attributes like > this:: > > from types import FunctionType > del dictionary_of(FunctionType)['func_closure'] > del dictionary_of(FunctionType)['func_code'] > > Of course, don't blame me if any of this code fries your computer and > gives you a disease, doesn't work with new versions of Python, etc. > etc. It works for me on Windows and Linux with Python 2.3, 2.4 and > 2.5. It may also work with 3.0, but remember that func_* attributes > have different names there. > >
-- love, tav founder and ceo, esp metanational llp plex:espians/tav | [EMAIL PROTECTED] | +44 (0) 7809 569 369 _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
