[SOLVED] python: sys.exit inside a try block

dedec0 · 07-02-2022, 04:57 PM

Did you know that if i call sys.exit(0) inside a try block, the program will cause an exception? Do you consider this a bug?

Code:

"""
bla bla bla
"""
import sys

try:
    print( "oi" )
    sys.exit(0)
except:
    print( "erro" )
    print( sys.exc_info() )
    sys.exit(1)

print( 'fim?' )

# vim: fileencoding=utf-8: expandtab: shiftwidth=4: tabstop=8: softtabstop=4

The output of this code is:

Code:

$ p3 min3.py 
oi
erro
(<class 'SystemExit'>, SystemExit(0), <traceback object at 0x7f1160bdd700>)

$ # and exit code of was 1, not 0!

boughtonp · 07-02-2022, 05:01 PM

It's not a bug, it's the documented behaviour of sys.exit()

Quote:

Originally Posted by https://docs.python.org/3/library/sys.html#sys.exit

Raise a SystemExit exception, signaling an intention to exit the interpreter.
...
Since exit() ultimately “only” raises an exception, it will only exit the process when called from the main thread, and the exception is not intercepted. Cleanup actions specified by finally clauses of try statements are honored, and it is possible to intercept the exit attempt at an outer level.

dedec0 · 07-02-2022, 05:48 PM

Okey. This is a surprise to me. Thank you for explaining and pointing the documentation, boughtonp. (: