On 6/4/2010 10:25 PM, Alf P. Steinbach wrote:
As far as I can think of now, one cannot add attributes to *any*
builtin-class instance, but can add attributes to any user class which
does not have them disabled.
>>> [].a = 3
Traceback (most recent call last):
File "<pyshell#15>", line 1, in <module>
[].a = 3
AttributeError: 'list' object has no attribute 'a'
>>> class L(list): pass
>>> i = L(); i; i.a = 3; i.a
[]
3
Terry Jan Reedy
You can add attributes to functions.
I'm not sure, but I think it was you who once provided me with a
reference to the relevant PEP (thanks!), so I guess it just slipped your
mind on a late Friday night. :-)
Right on both counts. Function attributes are exceptions, and they were
added after I learned Python.
Regarding user defined classes, I gather that by "have them [attributes]
disabled" you're including the case of a class with slots?
Yes. or custom __setattr__ or something.
tjr
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