Lecture 8: Debugging is an essential and perpetual part of programming. Debugging as differential diagnosis: characterize the bug, localize it in the code, try corrections. Tactics for characterizing the bug. Tactics for localizing the bug: traceback, print, warning, stopifnot. Test cases and dummy input generators. Interactive debuggers. Programming with an eye to debugging: writing code with comments and meaningful names; designing the code in a top-down, modular, functional manner; writing and using tests. A hint at the exception-handling system.
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