[Python-Dev] Adding features to 2to3... cpython/default right? can I backport to 2.7? (original) (raw)

Benjamin Peterson benjamin at python.org
Thu Dec 22 03:08:49 CET 2011

2011/12/21 Gregory P. Smith <greg at krypto.org>:

I have some features I need to add to lib2to3 to make it more useful for our purposes at work supporting our massive code base in a Python 2 to 3 transition. Which tree should I develop these and check these into?

cpython/default? Can I backport this to 3.2 and 2.7?  It counts as a feature addition which is normally a no-no for backports.  But in this case I'm enhancing 2to3 which is a useful tool.

You may backport things for 2to3. It's exempt from feature freeze.

No big deal to me personally if I can't backport from 3.3 (cpython/default) as I'd apply the changes to our copy at work internally but it seems wise to me for us to keep enhancing and improving 2to3 in a Python 2.x/3.x release independent manner to make people's conversions easier. The features I want to commit (all pretty easy additions) are command line flag / constructor option support for: 1) writing output files to a different directory tree instead of overwriting the input file. 2) modifying the output filename by altering the suffix (.py -> .py3 for example) 3) always writing output files even if there were no changes to make (useful in combination with the above to effectively act as a "copy library X to this directory converting it to python 3 syntax along the way"). The old http://hg.python.org/2to3/ tree exists but it really looks like an out of date version.

Indeed; I should probably just delete it.

-- Regards, Benjamin

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