This book describes mainly the language defined by Python version 2.5. Python version 3.0 (and its companion “transition” release, 2.6) isn’t all that different. Most things work just as they did before, but the language cleanups introduced mean that some existing code will break.

If you’re transitioning from older code to Python 3.0, a couple of tools can come in quite handy. First, Python 2.6 comes with optional warnings about 3.0 incompatibilities (run Python with the -3 flag). If you first make sure your code runs without errors in 2.6 (which is largely backward-compatible), you can refactor away any incompatibility warnings. (Needless to ...

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