On 18.05.15 15:14, Greg Ewing wrote:
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
structure.
Code that requires a particular C layout should be using
PyObject_TypeCheck, not PyObject_IsInstance.
Thank you. I didn't know about this helper.
Looks as most (if not all) usages of PyObject_IsInstance are not
correct. May be modify PyObject_IsInstance so that it will never return
true if layouts are not compatible?
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