[Python-3000] Could isinstance/issubclass overriding be dangerous?

Greg Ewing greg.ewing at canterbury.ac.nz
Mon Apr 30 03:48:45 CEST 2007

Currently, isinstance(x, C) implies that the
C struct layout of x is compatible with that
defined by C. I'm worried that changing this
could cause difficulties for extension modules
that use PyObject_IsInstance do decide what
to do with things, e.g. in a binary operator


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