On 11/24/2015 9:34 AM, Antoon Pardon wrote:
I agree that the tutorial should talk about default argument objects
(which have values) instead of conflating 'object' with 'value'.
Op 20-11-15 om 13:12 schreef Ned Batchelder:
I'm not sure what your goal is at this point. Are you:
1) still unsure what the behavior is, or
2) trying to understand why it behaves that way, or
3) hoping to change Python, or
4) trying to convince us that your language is better, or
5) something else?
Maybe just have us recognize that some aspects of python indeed are bizarre.
The current behavior under discussion is: default argument expressions
are evaluated once at function creation time to produce default argument
objects that are bound to the function object. I do not see this as
bizarre.
That there is nothing wrong with him thinking so.
I do recognize that some would prefer that default argument expressions
be treated differently, that
def f(a=expression): pass
be compiled to operate as the following does now
def f(a=None):
a = a if a is not None else expression
perhaps with None replaced with a hidden object() instance.
I find the continuing fuss over the choice that was made to be the
bizarre thing here.
--
Terry Jan Reedy
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