Tips for those wishing to create and maintain one Python codebase that works for both Python 2.X and Python 3.Y interpreters (for some value of X and Y).


Seeing one (very good) rant about how hard it is to use the officially blessed way of using 2to3 reminded me that I also ask users on Rosetta Code to allow code written in a style to work on both versions of Python interchangeably.

I thought we needed some central repository giving tips on how to do this and thought I would start with the rules stated on RC.

Simple rules for making code work on both 2.X and 3.Y

  1. Use brackets in print statements/functions of one expression.
  2. Use zip and not izip; keys(), values(), items() and not their iter- forms.
  3. Check for raw_input and set raw_input to input if not found.
  4. Conditionally import reduce if it is not found.

2and3 One codebase for dual version support (last edited 2013-08-09 06:56:37 by paddy3118)

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