What Are the Differences Between exit() and sys.exit() in Python?

Exit() vs. sys.Exit() in Python

In Python, both exit() and sys.exit() serve as functions for terminating a running program, but their usage and functionality differ.

exit()

exit() is commonly used within the interactive Python shell (e.g., as a standalone command typed into the interpreter console). It primarily serves to terminate the shell session by raising a SystemExit exception, effectively closing the session. Within the interactive shell, exit() aids in managing and finalizing actions before exiting.

sys.exit()

sys.exit(), on the other hand, is primarily intended for use within Python programs. It同样 raises a SystemExitexception, but unlike exit(), it does so within the sys module. This ensures consistency in handling program termination across different platforms and circumstances. Programmers can optionally specify an exit code within sys.exit() to provide information about the termination status.

When to Use Each Function:

• Interactive Shell: Use exit() to terminate a running Python shell session.
• Programs: Use sys.exit() within Python programs to control program termination and provide optional exit code information.

Technical Differences

Internally, sys.exit() calls a function within the sys module (sys.exit()) which raises the SystemExit exception. exit(), on the other hand, is defined in the site module (site.py) and makes use of a Quitter class to handle termination.

Note: A third exit option exists, os._exit(), which forcefully exits the program without calling cleanup handlers or performing standard process finalization tasks. This option should typically be reserved for specific use cases, such as in child processes after fork().

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