Catching KeyboardInterrupt in Python during program shutdown

Question

I m writing a command line utility in Python which  since it is production code  ought to be able to shut down cleanly without dumping a bunch of stuff  error codes  stack traces  etc   to the screen   This means I need to catch keyboard interrupts   I ve tried using both a try catch block like   if   name         main         try          main       except KeyboardInterrupt          print  Interrupted          sys exit 0    and catching the signal itself  as in this post    import signal import sys  def sigint handler signal  frame       print  Interrupted      sys exit 0  signal signal signal SIGINT  sigint handler    Both methods seem to work quite well during normal operation   However  if the interrupt comes during cleanup code at the end of the application  Python seems to always print something to the screen   Catching the interrupt gives   CInterrupted Exception KeyboardInterrupt in  lt bound method MyClass   del   of  lt path to MyClass object at 0x802852b90 gt  gt  ignored   whereas handling the signal gives either   CInterrupted Exception SystemExit  0 in  lt Finalize object  dead gt  ignored   or   CInterrupted Exception SystemExit  0 in  lt bound method MyClass   del   of  lt path to MyClass object at 0x802854a90 gt  gt  ignored   Not only are these errors ugly  they re not very helpful  especially to an end user with no source code    The cleanup code for this application is fairly big  so there s a decent chance that this issue will be hit by real users   Is there any way to catch or block this output  or is it just something I ll have to deal with

User · Answer

You could ignore SIGINTs after shutdown starts by calling signal signal signal SIGINT  signal SIG IGN  before you start your cleanup code

User · Answer

Checkout this thread  it has some useful information about exiting and tracebacks   If you are more interested in just killing the program  try something like this  this will take the legs out from under the cleanup code as well    if   name         main         try          main       except KeyboardInterrupt          print  Interrupted           try              sys exit 0          except SystemExit              os  exit 0

[python] Catching KeyboardInterrupt in Python during program shutdown

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