Sys.excepthook is missing

An error like:

close failed in file object destructor:
sys.excepthook is missing
lost sys.stderr

tl;dr:

• it's trying to report an exception through a file object

• ...where that's gone
  • usually because the program is in the middle of being shut down
  • or caused by a broken pipe (incoming SIGPIPE, Errno 32). Consider what a Ctrl-C does.

Roughly, python's exception handling seems to be

use sys.excepthook

if missing, write exception and traceback to sys.stderr

So if both of those were already cleaned up by something that caused an interpreter shutdown, you either

care about seeing this error a bunch earlier (often means restructuring how/where you catch errors)

don't care about this error at all (often means you want to swallow the exception)

If it's the latter, then the basic patchup is to swallow that specific case in a try-except.

In py2, that's a socket.error with errno==errno.EPIPE (socket.error inherits from IOError, but only since py2.6)

In py3, that that's a BrokenPipeError

(to account for both, you may want something like:

try:
   bperror = BrokenPipeError
except NameError:
   bperror = socket.error

try:
    #your main code
except bperror:
    pass