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

Michael Foord fuzzyman at voidspace.org.uk
Fri Dec 9 16:35:05 CET 2011

On 9 Dec 2011, at 15:13, Barry Warsaw wrote:

On Dec 09, 2011, at 09:20 AM, Martin v. Löwis wrote:

One use case (and the only one I'm aware of) is to pass keyword parameters. Python 2 insists that they are str (and doesn't accept unicode), Python 3 insists that they are str (and doesn't accept bytes).

This is fairly uncommon as a problem, though, and is also solved in Python 2.6, which does accept Unicode strings as keyword parameter names. Oh, I remember this one, because I think I reported and fixed it. But I take it as a given that Python 2.6 is the minimal (sane) version to target for one-codebase cross-Python code.

In mock (at least 5000 lines of code including tests) I target 2.4 -> 3.2+. Admittedly mock does little I/O but does some fairly crazy introspection (and even found bugs in Python 3 because of it).

The exception handling is the worst - no compatible syntax between 2.4-5 and Python 3. So you have to use sys.exc_info. Other than that it isn't too hard / bad.

All the best,

Michael

-Barry

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