[Python-Dev] readd u'' literal support in 3.3? (original) (raw)

exarkun at twistedmatrix.com exarkun at twistedmatrix.com
Wed Dec 14 00:36:28 CET 2011

On 09:37 pm, tjreedy at udel.edu wrote:

On 12/13/2011 10:54 AM, Vinay Sajip wrote:

I started writing a tool today, tentatively called '2to23', which aims to do this. It's basically 2to3, but with a package of custom fixers in a package 'lib2to23.fixers' adapted from the corresponding fixers in lib2to3. When, some year in the future, people want to drop Python 2 compatibility from their Python23 code, they will need a 23to3 tool.

No, they will not. They only need a 2to3 or 2to6 tool because Python 2 and Python 3 are not compatible with each other, but they want one program to be valid in Python 2 and Python 3 simultaneously.

When they decide they no longer care about Python 2, they can just stop taking care to keep their program valid as Python 2 and only take care to keep it a valid Python 3 program. There's no specific change to make, just a different approach to take with future maintenance.

You might say that they will want to immediately discard all of their legacy Python 2 support code. I suspect many of them will not want this; but either way it's a want, not a need.

Jean-Paul

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