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Clean Code Handbook
Naming, Functions, Comments, Error Handling, Small Classes, Refactoring Safely and Readable Code Reviews
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Every developer has opened a function called calc with arguments named o, t and c, and watched the afternoon disappear. This handbook shows you how to turn code like that into something a colleague can read in seconds, without changing what it does. Using one small fictional shop as a running example, it covers naming, functions that do one thing, short argument lists, comments that explain why, error handling, small classes and modules, duplication, flags and conditionals, and dead code. You learn to refactor in small safe steps, with tests that prove the behaviour stayed the same, and to run code reviews that improve readability without starting arguments. Examples use Python 3.14 and pytest, every one was run, and the principles apply in any language.
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