About the Notation

Pythonic Programming — by Dmitry Zinoviev (6 / 116)

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Each tip in the book comes with a brief “stars-and-numbers” annotation that describes its complexity and compatibility. The number of stars ranges from one ★ (a simple, almost trivial tip) to three ★★★ (an advanced tip). Naturally, the star ratings are subjective, but rest assured that any one-star tip is much simpler than any three-star tip. Most of the tips belong to the middle category.

The number or numbers in the exponent are the Python versions that are compatible with the tip. Most tips work for any Python at or above 2.7, but some require a more recent version. (And if you still have an installation of Python 2.6 that was officially retired in October 2013, you must seriously ask yourself why.)

The most common combination of stars and numbers is ★★2.7, 3.4+: an intermediate-to-advanced tip that works for any popular version of Python.

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