Seo Sanghyeon wrote:
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"?
Here's my guess:
Some objects have a fixed (and possibly empty) set of attributes.
Attempting to add a new attribute or get a non-existent attribute raises
an AttributeError.
Other objects, such as types (are there any that aren't types?), don't
have attributes at all. Attempting to add or get an attribute raises a
TypeError.
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