How Replacing Magic Numbers with Named Constants Cleans Up Legacy Code

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A software developer shares lessons learned from refactoring a legacy service containing over 2,000 lines of code riddled with unexplained literal values, often called 'magic numbers.' The core fix involves replacing hard-coded values like file size limits, retry counts, and thumbnail dimensions with clearly named constants stored in a dedicated file. This approach improves readability, reduces bugs caused by inconsistent updates across multiple code locations, and makes testing easier. The refactored code becomes self-documenting, since constant names like MAX_UPLOAD_ATTEMPTS convey intent without relying on comments that can become outdated. The article uses a Python file-upload function as a practical before-and-after example to illustrate the technique.

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