atexception.py 文件源码

def _run_handlers():
    """_run_handlers()

    Run registered handlers.  They run in the reverse order of which they were
    registered.

    If a handler raises an exception, it will be printed but nothing else
    happens, i.e. other handlers will be run.
    """
    context.clear()
    for _ident, (func, args, kwargs, ctx) in \
        sorted(_handlers.items(), reverse = True):
        try:
            with context.local(**ctx):
                func(*args, **kwargs)
        except SystemExit:
            pass
        except:
            # extract the current exception and rewind the traceback to where it
            # originated
            typ, val, tb = sys.exc_info()
            traceback.print_exception(typ, val, tb.tb_next)

# we rely on the existing excepthook to print exceptions