[Python-Dev] Backporting PEP 3127 to trunk
Guido van Rossum
guido at python.org
Thu Feb 21 23:31:00 CET 2008
I wonder if, in order to change the behavior of various built-in
functions, it wouldn't be easier to be able to write
from future_builtins import oct, hex # and who knows what else
Agreed with your approach for bin().
On Thu, Feb 21, 2008 at 2:26 PM, Eric Smith
<eric+python-dev at trueblade.com> wrote:
> I'm going to work on backporting PEP 3127, specifically the hex, oct(),
> and bin() builtins. I have bin() completed, and I'll check it in
> shortly. oct() will require a future import. Does anyone have any
> pointers for implementing this? I understand (and have completed)
> adding the future import, but what I don't understand is how to modify
> the behavior of oct() for only the module where the future import is
> execute. Any rough ideas or pointers to existing code that does
> something similar would be helpful. I also need a name for the future
> import statement.
>
> Also, I notice in py3k that __hex__ and __oct__ have vanished, and
> instead hex() and oct() just uses the __index__ machinery to produce a
> number, then converts that to a string. So I'm thinking that maybe we
> could use the same future import statement that controls oct()'s
> behavior to also switch hex() and oct() to the py3k behavior. Or, maybe
> we should use a different future import? Or, I guess, not do this at
> all. But I think it's a good idea.
>
> I guess another issue is changing hex()'s behavior of adding a trailing
> L for longs. I don't really see the value in this, and maybe it should
> also change with a future import statement.
>
> For bin(), I just used the py3k behavior, and didn't implement a __bin__
> method. I'm also not adding a trailing L for longs. I think that makes
> the most sense.
>
> Eric.
>
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--
--Guido van Rossum (home page: http://www.python.org/~guido/)
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