Extract magic numbers into named constants to clean legacy Python code

Short summary

Magic numbers in legacy code breed bugs and confusion. Extract them into clearly named constants to improve readability, maintainability, and testability. Real Python example shows an upload handler refactored from scattered literals to organized constants—reducing regression risk and accelerating team onboarding.

• •Named constants replace scattered magic numbers in legacy code
• •Improves readability, safety, and testability while documenting intent
• •Practical Python example shows dramatic reduction in cognitive overhead

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