DRY is a maintainability rule: give each repeated piece of code or knowledge one shared representation. Duplication forces every future change to be made in several places, increasing inconvenience and the risk of inconsistent behavior. When repetition appears, consider refactoring it into a variable, function, or other shared structure. section 1.1.2 section 2.1.4
Extract a repeated f-string format
Repeated formatting makes a later alignment change require multiple edits:\n\nfor i in range(3):\n print(f'{task_ids[i]:^12}{task_names[i]:^12}{task_urgencies[i]:^12}')\n\nExtract the format specifier and make it configurable instead:\n\ndef create_formatted_records(fmt):\n for i in range(3):\n task_id = task_ids[i]\n name = task_names[i]\n urgency = task_urgencies[i]\n print(f'{task_id:{fmt}}{name:{fmt}}{urgency:{fmt}}')\n\ncreate_formatted_records('^15')\n\nNow the shared formatting rule is changed once, while the function can support different widths such as '^18'. This refactoring changes structure without adding features or changing the program's external behavior. section 2.1.4
