def _DebugHandler(exc_class, value, tb):
if not flags.FLAGS.pdb or hasattr(sys, 'ps1') or not sys.stderr.isatty():
# we aren't in interactive mode or we don't have a tty-like
# device, so we call the default hook
old_excepthook(exc_class, value, tb)
else:
# Don't impose import overhead on apps that never raise an exception.
import traceback
import pdb
# we are in interactive mode, print the exception...
traceback.print_exception(exc_class, value, tb)
sys.stdout.write('\n')
# ...then start the debugger in post-mortem mode.
pdb.pm()
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