socket.py 文件源码

def sendto(self, *args):
        sock = self._sock
        try:
            return sock.sendto(*args)
        except error:
            ex = sys.exc_info()[1]
            if ex.args[0] != EWOULDBLOCK or timeout == 0.0:
                raise
            sys.exc_clear()
            self._wait(self._write_event)
            try:
                return sock.sendto(*args)
            except error:
                ex2 = sys.exc_info()[1]
                if ex2.args[0] == EWOULDBLOCK:
                    return 0
                raise