On 1/12/07, Steven Bethard <[EMAIL PROTECTED]> wrote: > Yeah, when this was talked about last time, I wrote PEP 3002 which > requests exactly this: > > http://www.python.org/dev/peps/pep-3002/ > > It basically proposes that all backwards-incompatible changes be > discussed in a PEP somewhere, and that code like Anthony's be added to > 2.X to ease the transition. Originally, it has proposed just a > utility like Guido's 2to3 but Guido himself suggested something like > Anthony's approach: > > http://mail.python.org/pipermail/python-3000/2006-April/001444.html
To complement 2to3, not to replace it. > I'm planning to update the PEP with any new conclusions arrived at in > this thread. I think that now the 2to3 tool is a reality, its limitations should perhaps be taken into account. For example, I don't believe it is realistic to expect it to do semantic analysis, which means that for example it can't be expected to know whether 'd' in 'd.keys()' is a dict or something else. Also, in 'k = d.keys()' it can't be expected to analyze how k is used later on; to be safe, it will translate all occurrences of d.keys() into list(d.keys()) which is known to work (and won't be slower than the original code either). -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
