How to exit from Python without traceback

Question

I would like to know how to I exit from Python without having an traceback dump on the output    I still want want to be able to return an error code but I do not want to display the traceback log   I want to be able to exit using exit number  without trace but in case of an Exception  not an exit  I want the trace

User · Answer

import sys sys exit 1

User · Answer

It s much better practise to avoid using sys exit   and instead raise handle exceptions to allow the program to finish cleanly   If you want to turn off traceback  simply use   sys trackbacklimit 0   You can set this at the top of your script to squash all traceback output  but I prefer to use it more sparingly  for example  known errors  where I want the output to be clean  e g  in the file foo py   import sys from subprocess import    try    check call    uptime    --help     except CalledProcessError    sys tracebacklimit 0   print  Process failed    raise  print  This message should never follow an error     If CalledProcessError is caught  the output will look like this    me test01 dev     foo py usage  uptime  -V      -V    display version Process failed subprocess CalledProcessError  Command    uptime    --help    returned non-zero exit status 1   If any other error occurs  we still get the full traceback output

User · Answer

Pygame Example    import pygame  sys   from pygame locals import    pygame init     DISPLAYSURF   pygame display set mode  400  300     pygame display set caption  IBM Emulator    BLACK    0  0  0    GREEN    0  255  0   fontObj   pygame font Font  freesansbold ttf   32    textSurfaceObj   fontObj render  IBM PC Emulator   True  GREEN BLACK    textRectObj   textSurfaceObj get rect     textRectObj    10  10   try        while True    main loop           DISPLAYSURF fill BLACK            DISPLAYSURF blit textSurfaceObj  textRectObj            for event in pygame event get                  if event type    QUIT                    pygame quit                     sys exit             pygame display update     except SystemExit        pass

User · Answer

What about  import sys                sys exit  I am getting the heck out of here      No traceback and somehow more explicit

User · Answer

You are presumably encountering an exception and the program is exiting because of this  with a traceback    The first thing to do therefore is to catch that exception  before exiting cleanly  maybe with a message  example given    Try something like this in your main routine   import sys  traceback  def main        try          do main program stuff here                  except KeyboardInterrupt          print  Shutdown requested   exiting      except Exception          traceback print exc file sys stdout      sys exit 0   if   name         main         main

User · Answer

I would do it this way   import sys  def do my stuff        pass  if   name         main         try          do my stuff       except SystemExit  e          print e

User · Answer

Use the built-in python function quit   and that s it  No need to import any library  I m using python 3 4

User · Answer

Perhaps you re trying to catch all exceptions and this is catching the SystemExit exception raised by sys exit     import sys  try      sys exit 1    Or something that calls sys exit   except SystemExit as e      sys exit e  except        Cleanup and reraise  This will print a backtrace         Insert your cleanup code here       raise   In general  using except  without naming an exception is a bad idea  You ll catch all kinds of stuff you don t want to catch -- like SystemExit -- and it can also mask your own programming errors  My example above is silly  unless you re doing something in terms of cleanup  You could replace it with   import sys sys exit 1    Or something that calls sys exit      If you need to exit without raising SystemExit   import os os  exit 1    I do this  in code that runs under unittest and calls fork    Unittest gets when the forked process raises SystemExit  This is definitely a corner case

User · Answer

The following code will not raise an exception and will exit without a traceback   import os os  exit 1    See this question and related answers for more details  Surprised why all other answers are so overcomplicated

User · Answer

something like import sys  sys exit 0

[python] How to exit from Python without traceback?

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