Web Reference: Jul 12, 2025 · Among the above four exit functions, sys.exit () is preferred mostly because the exit () and quit () functions cannot be used in production code while os._exit () is for special cases only when the immediate exit is required. Nov 3, 2013 · The functions * quit(), exit(), and sys.exit() function in the same way: they raise the SystemExit exception. So there is no real difference, except that sys.exit() is always available but exit() and quit() are only available if the site module is imported (docs). Nov 4, 2024 · Python’s sys.exit () provides a way to terminate a script or program immediately. This function allows you to exit a program with a custom status code for better control and handling. This guide explores how sys.exit () works, when to use it, and its importance in program flow and error handling.
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