On Wed, Jan 15, 2014 at 01:22:44PM +0100, "Martin v. Löwis" wrote: > Am 12.01.14 18:39, schrieb Nachshon David Armon: > >>> I propose that this new version of python use the python 3 unicode model. > >>> As the version of python will be fully compatible with both python 2 and > >>> with python 3 but NOT necsesarily with all existing code in either. It is > >>> designed as a porting tool only. > > I don't think that it is possible to write an interpreter that is fully > compatible for all it accepts. Would you think that the program > > print(repr(2**80).endswith("L")) > > is in the subset that should be supported by both Python 2 and Python 3?
IMO Python 2 and 3 do have this part in common when you talk about valid syntax and available methods and functions, but not in terms of behavior. I think a new proposed Python version should simply crash on your example. I'm kind-of playing devil's advocate here because i agree with previous posters that such a Python version is unneccessary with tox and "python2 -3" > > Notice that it prints "True" in Python 2 and "False" in Python 3. So if > this common-version interpreter *rejects* the above program, which > operation (**, repr, endswith) would you want to ban from subset? Warnings about using certain string methods on repr() might be a neat thing to add to "python -3" or static analysis tools. > > Regards, > Martin > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/markus%40unterwaditzer.net _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com