On Sep 3, 2014, at 12:55 AM, Wolfgang Rohdewald <wolfgang....@rohdewald.de> wrote:
> Am Mittwoch, 3. September 2014, 00:29:59 schrieb Glyph: >>> That is my problem. How do I know if the object is of a non-class class? >> >> isinstance(something, (types.ClassType, type)). > > but that will make it possible to attach a method even to type "int" Yes, that's fine. 'int' has methods, there's no reason that those methods couldn't be serialized by jelly. For example: >>> (3).conjugate <built-in method conjugate of int object at 0x7feb18410a78> The bound method object there is the sort of thing that we're talking about. Particularly since we might be talking about a subclass of 'int' with its own overridden conjugate method, and the im_class attribute says which class the method's function actually came from. > Python2: > >>>> isinstance(int, type) > True > >>>>> isinstance(object, type) >> True >>>>> isinstance(object(), type) >> False > Sure but the test only gets the class and it should certainly not instantiate > it. Right; the point is that you get a thing, and that thing may be a class object _or_ it might be an instance object, and if it's an instance that's invalid. > Meanwhile I believe it is best to simply remove the test since python itself > will reject most: > >>>> a=int >>>> a.x=5 > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: can't set attributes of built-in/extension type 'int' This is about serializing and deserializing existing methods, not assigning attributes to instances. -glyph
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