debug.py 文件源码

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()