[Python-Dev] Semantic of isinstance (original) (raw)

Phillip J. Eby pje at telecommunity.com
Wed Jun 28 02:41:08 CEST 2006


At 12:02 PM 6/28/2006 +1200, Greg Ewing wrote:

Martin v. Löwis wrote:

> Again, I believe this is all included for ExtensionClasses: it looks > for class on the object if the type check fails, so that an > ExtensionClass could be actually a class derived from the C type. Now that we have had new-style classes for quite a while, is there still a need to support ExtensionClasses?

That's the wrong question. The right question is, "is there a need to support isinstance() for proxy objects?" and the answer is yes.

As far as I know, nobody has proposed to change this behavior of isinstance(), nor even suggested a reason for doing so.



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