[Python-Dev] PyObject_IsInstance is dangerous
greg.ewing at canterbury.ac.nz
Mon May 18 14:14:24 CEST 2015
Serhiy Storchaka wrote:
> PyObject_IsInstance is not safe when used to check if the object is an
> instance of specified builtin type.
> The __class__ attribute can be modified and PyObject_IsInstance() can
> return true if the object has not layout compatible with specified
Code that requires a particular C layout should be using
PyObject_TypeCheck, not PyObject_IsInstance.
More information about the Python-Dev