[Twisted-Python] what is a non-class class?

[Glyph]

On Sep 2, 2014, at 11:45 PM, Wolfgang Rohdewald <wolfgang.kde at rohdewald.de> wrote:

> I still do not like "non-class class" because this is a contradiction
> in itself.

How about "non-class found in class slot when deserializing method object"?

> Anyway a non-class class is a class whose objects may not get a 
> method attached. So far so good, but that was obvious.

Uh... no?  A non-class in an object which is not a class.  The error is when that object is provided as the class associated with a method.

> Am Dienstag, 2. September 2014, 16:29:41 schrieb Glyph Lefkowitz:
>> Except I think it might be broken in the face of new-style classes;
>> ClassType is the old-style class type, 'type' is the new one, so,
>> that should probably be fixed
> 
> That is my problem. How do I know if the object is of a non-class class?

isinstance(something, (types.ClassType, type)).

> As you say, current code does not handle new style classes.

Yes, but it could be easily modified to do so.

> I cannot check if the object is of type "type" because 
> int is also of type "type". An int certainly should not get
> a method attached. Then we could just as well remove this check.

>>> isinstance(object, type)
True
>>> isinstance(object(), type)
False

> That is why I proposed to instead exclude a list of basic types
> int, float, list, dict, set and so on.

I'm not sure I understand the proposal.  But in any case - it's not necessary.  It's clearly possible to determine if a particular value is a type or not.

-glyph