AIWIBoardContext.py 文件源码

def __enter__(self):
        # Make sure to cleanup GPIO afterward
        if not self.__signals_trapped:
            self.__signals_trapped = True
            for sig in [signal.SIGQUIT, signal.SIGTERM, signal.SIGTSTP]:
                if hasattr(signal.getsignal(sig), '__call__'):
                    deleg = signal.getsignal(sig)

                    def delegate(signum, stack):
                        self.__exit__(None, None, None)
                        deleg(signum, stack)

                    signal.signal(sig, delegate)
                else:
                    def delegate(signum, stack):
                        self.__exit__(None, None, None)

                    signal.signal(sig, delegate)
        return self