The purpose of this book is to show you how to write Python programs in good
idiomatic Python 3 style, and to be a useful reference for the Python 3 language
after the initial reading. Although Python 3 is an evolutionary rather than revolutionary
advance on Python 2,some older practices are no longer appropriate
or necessary in Python 3, and new practices have been introduced to take advantage
of Python 3 features. Python 3 is a better language than Python 2—it
builds on the many years of experience with Python 2 and adds lots of new
features (and omits Python 2’s misfeatures), to make it even more of a pleasure
to use than Python 2, as well as more convenient, easier, and more consistent
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