$ cat e.py
raise Exception
$ python e.py
Traceback (most recent call last):
File "e.py", line 1, in <module>
raise Exception
Exception
$ echo $?
1
I would like to change this exit code from 1 to 3 while still dumping the full stack trace. What's the best way to do this?
Take a look at the traceback module. You could do the following:
import sys, traceback
try:
raise Exception()
except:
traceback.print_exc()
sys.exit(3)
This will write traceback to standard error and exit with code 3.
try/except clause? I'd prefer to just call something once, maybe by importing a specific module, and then each raising of ExceptionWhichCausesExitCode3() should exit the program with exit code 3.You can use sys.excepthook to handle uncaught exceptions:
import sys
import traceback
from types import TracebackType
def handle_exception(
type_: type[BaseException], value: BaseException, tb: TracebackType | None
) -> None:
traceback.print_tb(tb)
sys.exit(3)
sys.excepthook = handle_exception
raise Exception
Output:
$ python test.py
File "/tmp/scratch/scratch005/test.py", line 15, in <module>
raise Exception
$ echo $?
3
This answer also shows how to specially handle specific types of exceptions while falling back to the default behavior for all other types. For example, you could treat ExceptionWhichCausesExitCode3 specially, while exiting in a normal way for other exceptions
1the default return code value python uses upon an unhandled exception bubbling all the way to the top? I wonder if it varies by exception type.