On Sun, Mar 16, 2008 at 4:22 PM, "Martin v. Löwis" <[EMAIL PROTECTED]> wrote: > >> Wrt. invoking it from distutils: Why not? > > > > Because it's far from perfect. I'd expect the success rate of running > > 2to3 over a 2.x package to be close to zero. I think this is one case > > where it's better to let the developer run 2to3 and tweak the app > > until it actually works. > > Ah. I still dream of people being able to use a single source for both > 2.x and 3.x. They would maintain their source as 2.x, and convert to > 3.0 at deployment time. > > Of course, they have to change their source to make that actual work. > Most distutils projects probably won't work when all you do is run > 2to3. However, if a project has prepared its source in a proper way > (for some definition of "proper"), it *should* be possible that all > remaining changes are done by 2to3. > > People would try the process on their development machines, and change > the code until it actually runs under both versions. > > I'll be using my sprinting time to find out whether that approach > can actually work.
That would be good. I agree with the ideal process, but I doubt that it will realistically work exactly like that, so I expect that calling 2to3 upon install is just going to cost a lot of CPU time and then produce a non-working install. > >> Wrt. this covering all uses: Surely the ones that people > >> would use the library for, no? > > > > I not understand. :-( > > When people requested that 2to3 is a library, I think they > have exactly that use case in mind: programmatically convert > a source code base at deployment/build time. In those cases, > they can achieve the same thing with the command line tool. I don't recall what the person who asked about this after my keynote had in mind, but it sounds to me like converting code at install time a minority use case -- especially while 2to3 is as slow as it is. > Of course, on Windows, it is probably still better to use > the library, since Python will find the library, but may > not find the command line tool. Good point. -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
