exit() vs sys.exit()

exit_vs_sys_exit.txt

❯ python
Python 3.10.7 (main, Sep  7 2022, 12:19:18) [GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> try:
...     exit()
... except SystemExit:
...     print("no exit for you")
... finally:
...     print("cleanup")
... 
no exit for you
cleanup
>>> import sys
>>> try:
...     sys.exit()
... except SystemExit:
...     print("no exit for you")
... finally:
...     print("cleanup")
... 
no exit for you
cleanup
>>>

❯ python -m timeit -n 1000000 $'try: exit()\nexcept SystemExit: pass'
1000000 loops, best of 5: 472 nsec per loop

❯ python -m timeit -n 1000000 -s 'import sys' $'try: sys.exit()\nexcept SystemExit: pass'
1000000 loops, best of 5: 209 nsec per loop