[Python-Dev] Exception for setting attributes of built-in type (original) (raw)
Seo Sanghyeon sanxiyn at gmail.com
Sun Jun 14 21:09:25 CEST 2009
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Exception for setting attributes of built-in type differs between CPython and IronPython. This is not purely theoretical, as zope.interface tries to set Implements declaration as implemented attribute of built-in type object, and excepts TypeError.
Python 2.6.1
object.flag = True TypeError: can't set attributes of built-in/extension type 'object'
IronPython 2.6
object.flag = True AttributeError: 'object' object has no attribute 'flag'
I was surprised that CPython raises TypeError. Library Reference seems to mention it here:
exception AttributeError Raised when an attribute reference or assignment fails. (When an object does not support attribute references or attribute assignments at all, TypeError is raised.) http://docs.python.org/library/exceptions.html
What does it mean that "an object does not support attribute references or attribute assignments at all"?
-- Seo Sanghyeon
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