ANN: pyparsing 1.5.1 released

[Terry Reedy]

Rob Williscroft wrote:

> AIUI the idea is that you write your 2.x python code (and tests) so 
> that when they are processed by 2to3.py you get valid python 3.x 
> code that will pass all its tests.  
> 
> You then maintain your 2.x code base adding another test where the
> code (and tests) is run through 2to3.py and then python 3.x runs
> the test suite.
> 
> Presumably you only need to start maintining a 3.x code base when
> you start adding 3.x specific features or abandon support for
> 2.x python.

http://wiki.python.org/moin/Early2to3Migrations

reports some early experiences (some a year old).  Martin's was edited 
most recently, but even his report misses recent changes to 2to3.