On October 5, the Python Software Foundation released Python 3.9. Previously, the Python team had been following an 18-month development and release cycle but has now shifted to an annual release cycle. The latest version of this highly popular language has brought forth several new features. Here, we enlist the most prominent ones.

Introduction of PEG-Based Parser

Python 3.9 proposes to replace the current LL(1)-based parser with a high-performing and more stable Parsing Expression Grammar (PEG) parser. With this replacement, the new parser will lift the current LL (1) grammar Python restriction. The PEG parser differs from its predecessor in a way that is not context-free. The fundamental difference is that the choice operator is ordered.

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