Functional Python & the functools Toolkit

Pure Functions & Immutability

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Explore the idea

Pure Functions — The Core Idea

Opening your lesson…

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IN THIS LESSON

YOU’RE LEARNING TO

↗distinguish pure from impure functions and identify side effects

↗explain referential transparency and why it enables equational reasoning

↗apply immutability patterns using tuples, frozensets, and frozen dataclasses

↗explain how functional discipline reduces bugs and improves testability