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Nested Loops in Python: Fixing Data Structures and Responsibilities for Cleaner Design

Nested loops in programming often signify a violation of structural design principles rather than inherent algorithmic inefficiency; they serve as indicators that data structures do not align with relational requirements or that responsibilities exceed appropriate abstraction levels. The core mechanism involves restructuring computational logic by implementing proper associations through dictionary-like mappings and encapsulating low-level behavior within domain objects, thereby satisfying the Single Responsibility Principle and separating concerns between high-level orchestration and specific operational rules. This concept belongs to software architecture and code refactoring theory, where it operates as a diagnostic signal for correcting bad design patterns in procedural or object-oriented systems to enhance maintainability and clarity.