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The idea of "breaking compatibility" is not really a boolean: it is measured in the scalar unit of "difficulty required to regain compatibility".



In that case I'd say changing print would belong to the "trivial" end of the scale. Print function was backported to Python 2.6, so you can easily write code that is compatible with both. And modifying existing code is so trivial that even an automated tool (2to3) can do it reliably.




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