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

Greg Ewing greg.ewing at canterbury.ac.nz
Tue Jun 27 07:08:06 CEST 2006

Phillip J. Eby wrote:

It's not inconsistent - isinstance() checks class in addition to type() in order to allow proxying tricks like lying about your class.

If this is a deliberate feature, it's a bit patchy, because it means the proxy can't lie about not being an instance of its real type.

Perhaps Guido could clarify how much lying a proxy is supposed to be able to get away with?

-- Greg