On 1/24/2015 4:14 PM, Mario Figueiredo wrote:
In article <54c39366$0$13006$c3e8da3$54964...@news.astraweb.com>,
steve+comp.lang.pyt...@pearwood.info says...
AttributeError: 'Sub' instance has no attribute '__bases__',
AttributeError: 'foo' object has no attribute '__bases__'
The first would be nice. The second is impossible: objects may have no name,
one name, or many names, and they do not know what names they are bound to.
So the Sub instance bound to the name 'foo' doesn't know that its name
is 'foo', so it cannot display it in the error message.
Thanks for the information! :)
But that begs the OT question: How does Python maps names to memory
addresses in the interpreter?
Python the language maps names to objects that have identity, type, and
value. The CPython implementation does the mapping with a hash table
and C pointers (to computer memory addresses), but addresses are not
part of the language definition. Neuroscientists still puzzle over how
we do such mapping.
"__main__"
from module import a_name
A module is a namespace associating names with objects. This statememt
says to import the a_name to object association from module and add it
to __main__
y = a_name + 1
This statement uses the imported association in __main__ to access the
object and add 1, and bind 'y' to the resulting object.
--
Terry Jan Reedy
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