def test_subscribe_transactions(self, alice):
        gen_and_sync_lnd(alice.bitcoin, [alice])
        subscription = alice.subscribe_transactions()
        alice.add_funds(alice.bitcoin, 1)
        assert isinstance(subscription, grpc._channel._Rendezvous)
        assert isinstance(subscription.__next__(), rpc_pb2.Transaction)

        # gen_and_sync_lnd(alice.bitcoin, [alice])
        # transaction_updates = queue.LifoQueue()
        #
        # def sub_transactions():
        #     try:
        #         for response in alice.subscribe_transactions():
        #             transaction_updates.put(response)
        #     except StopIteration:
        #         pass
        #
        # alice_sub = threading.Thread(target=sub_transactions(), daemon=True)
        # alice_sub.start()
        # time.sleep(1)
        # while not alice_sub.is_alive():
        #     time.sleep(0.1)
        # alice.add_funds(alice.bitcoin, 1)
        #
        # assert any(isinstance(update) == rpc_pb2.Transaction for update in get_updates(transaction_updates)) 

def test_subscribe_channel_events(self, bitcoind, bob, carol):
        bob, carol = setup_nodes(bitcoind, [bob, carol])
        gen_and_sync_lnd(bitcoind, [bob, carol])
        chan_updates = queue.LifoQueue()

        def sub_channel_events():
            try:
                for response in bob.subscribe_channel_events():
                    chan_updates.put(response)
            except grpc._channel._Rendezvous:
                pass

        bob_sub = threading.Thread(target=sub_channel_events, daemon=True)
        bob_sub.start()
        time.sleep(1)
        while not bob_sub.is_alive():
            time.sleep(0.1)
        channel_point = bob.list_channels()[0].channel_point

        bob.close_channel(channel_point=channel_point).__next__()
        generate(bitcoind, 3)
        gen_and_sync_lnd(bitcoind, [bob, carol])
        assert any(
            update.closed_channel is not None for update in get_updates(chan_updates)
        ) 

def find_index(self, value, starting_node=0):
        """Find the index of the first node that matches value in a BFS

        Performs a breadth-first search of the graph starting at node index
        starting_node.  Returns the index or None if no match is found

        Args:
            value(Node Value) - Value to match against in the graph
            starting_node(int) - Node index to start search from
        """
        if starting_node > self.node_count():
            raise IndexError("Node ID out of range.")

        node_queue = queue.LifoQueue()
        node_queue.put(starting_node)
        visited = [starting_node]
        while not node_queue.empty():
            next_id = node_queue.get()
            if (self.nodes[next_id].value == value):
                return next_id  # Success
            for uid in self.neighbors[next_id]:
                if (self.uid_to_index[uid] not in visited):
                    node_queue.put(self.uid_to_index[uid])
                    visited += [self.uid_to_index[uid]]
        return None 

def ispar(s):
    # code here
    import queue
    stack = queue.LifoQueue()
    
    for i in range(len(s)):
        if ((s[i] == '{') | (s[i] == '[') | (s[i] == '(')):
            stack.put(s[i])
        if ((s[i] == '}') | (s[i] == ']') | (s[i] == ')')):
            if stack.empty():
                return False
            elif not isMatchingPair(stack.get(),s[i]):
                return False
        
    if stack.empty():
        return True
    else:
        return False 

def __init__(self, host=DEFAULT_LISTEN_HOST, port=DEFAULT_LISTEN_PORT, ssl_context: Optional[SSLContext] = None,
                 default_waiting_settings: Optional[WaitingSettings] = None):
        """
        Initializes the instance.

        """
        self.host = host
        self.port = port
        self.server = None
        self.server_thread = None
        self.assertions = []
        self.log = []
        self.ordered_handlers = []
        self.oneshot_handlers = RequestHandlerList()
        self.handlers = RequestHandlerList()
        self.permanently_failed = False
        self.ssl_context = ssl_context
        if default_waiting_settings is not None:
            self.default_waiting_settings = default_waiting_settings
        else:
            self.default_waiting_settings = WaitingSettings()
        self._waiting_settings = copy(self.default_waiting_settings)
        self._waiting_result = queue.LifoQueue(maxsize=1) 

def __init__(self):
        super().__init__()
        self._handling_lock = Lock()
        self._teardown_callback_stack = LifoQueue()  # we execute callbacks in the reverse order that they were added
        self._logger = log.get_logger(__name__)
        self._handled_exceptions = Queue()
        self._teardown_callback_raised_exception = False

        # Set up handlers to be called when the application process receives certain signals.
        # Note: this will raise if called on a non-main thread, but we should NOT work around that here. (That could
        # prevent the teardown handler from ever being registered!) Calling code should be organized so that this
        # singleton is only ever initialized on the main thread.
        signal.signal(signal.SIGTERM, self._application_teardown_signal_handler)
        signal.signal(signal.SIGINT, self._application_teardown_signal_handler)
        try:
            signal.signal(process_utils.SIGINFO, self._application_info_dump_signal_handler)
        except ValueError:
            self._logger.warning('Failed to register signal handler for SIGINFO. This is expected if ClusterRunner '
                                 'is running on Windows.') 

def __init__(self, mode):
        self.mode = mode
        self.conf = capture_conf.env[mode]
        self.init_sources(self.conf.source_paths)
        self.detector = Predict.instance()
        self.trackers = [Tracker(nn_matching.NearestNeighborDistanceMetric("cosine", self.conf.track_max_cosine_distance, self.conf.track_nn_budget),
                                 max_iou_distance=self.conf.track_max_iou_distance,
                                 max_age=self.conf.track_max_age,
                                 n_init=self.conf.track_n_init)
                         for _ in self.sources_parsed]
        self.track_pool = new_pools(self.conf.pool_size)
        self.save_pool = new_pools(self.conf.pool_size)
        self.frame_index = 0
        self.video_state = False
        if self.conf.video_on:
            self.box_queue = queue.LifoQueue(100)
            if self.conf.is_async:
                submit(self.video_on)
        self.debug = mode == 'dev'
        if self.debug:
            self.last_time = datetime.now()
            self.fps = 0
            self.pids = set() 

def __init__(self, dataloder, batchSize=1, queueSize=1024):
        # initialize the file video stream along with the boolean
        # used to indicate if the thread should be stopped or not
        self.det_model = Darknet("yolo/cfg/yolov3-spp.cfg")
        self.det_model.load_weights('models/yolo/yolov3-spp.weights')
        self.det_model.net_info['height'] = opt.inp_dim
        self.det_inp_dim = int(self.det_model.net_info['height'])
        assert self.det_inp_dim % 32 == 0
        assert self.det_inp_dim > 32
        self.det_model.cuda()
        self.det_model.eval()

        self.stopped = False
        self.dataloder = dataloder
        self.batchSize = batchSize
        # initialize the queue used to store frames read from
        # the video file
        self.Q = LifoQueue(maxsize=queueSize) 

def __init__(self, webcam = 0, batchSize=1, queueSize=256):
        # initialize the file video stream along with the boolean
        # used to indicate if the thread should be stopped or not
        self.det_model = Darknet("yolo/cfg/yolov3-spp.cfg")
        self.det_model.load_weights('models/yolo/yolov3-spp.weights')
        self.det_model.net_info['height'] = opt.inp_dim
        self.det_inp_dim = int(self.det_model.net_info['height'])
        assert self.det_inp_dim % 32 == 0
        assert self.det_inp_dim > 32
        self.det_model.cuda()
        self.det_model.eval()

        self.stream = cv2.VideoCapture(int(webcam))
        assert self.stream.isOpened(), 'Cannot open webcam'
        self.stopped = False
        self.batchSize = batchSize

        # initialize the queue used to store frames read from
        # the video file
        self.Q = LifoQueue(maxsize=queueSize) 

def test_subscribe_invoices(self, alice):
        """
        Invoice subscription run as a thread
        """
        gen_and_sync_lnd(alice.bitcoin, [alice])
        invoice_updates = queue.LifoQueue()

        def sub_invoices():
            try:
                for response in alice.subscribe_invoices():
                    invoice_updates.put(response)
            except grpc._channel._Rendezvous:
                pass

        alice_sub = threading.Thread(target=sub_invoices, daemon=True)
        alice_sub.start()
        time.sleep(1)
        while not alice_sub.is_alive():
            time.sleep(0.1)
        alice.add_invoice(value=SEND_AMT)
        alice.daemon.wait_for_log("AddIndex")
        time.sleep(0.1)

        assert any(
            isinstance(update, rpc_pb2.Invoice)
            for update in get_updates(invoice_updates)
        ) 

def __init__(self, configs, stopper: threading.Event):
        super().__init__()
        self.configs = configs
        self.stopper = stopper
        self.input_q = LifoQueue()
        self.output_q = LifoQueue() 

def removePair(s):
    # code here
    import queue
    stack = queue.LifoQueue()
    r = ''
    stack.put(s[0])
    for i in range(1,len(s)):
        if stack.empty():
            stack.put(s[i])
        else:
            f = stack.get()
            if f != s[i]:
                stack.put(f)
                stack.put(s[i])
            else:
                stack.put(f)
                g = stack.get()
                if g == s[i]:
                    pass
    while (stack.empty() is not True):
        x = stack.get()
        r = x + r
    if r != '':
        return r
    else:
        return "Empty String" 

def _create_session_pool(self):
        # Create a pool to reuse sessions containing connections to the server
        session_pool = LifoQueue()
        for _ in range(self._session_pool_size):
            session_pool.put(self.create_session(), block=False)
        return session_pool 

def __iter__(self):
        stack = LifoQueue()
        for element in self._iterable:
            stack.put(element)
        while not stack.empty():
            yield stack.get() 

def __init__(self, playerManager):
        self.playerManager = playerManager

        self.is_menu_shown = False
        self.menu_title = ""
        self.menu_stack = LifoQueue()
        self.menu_list = []
        self.menu_selection = 0
        self.menu_tmp = None
        self.original_osd_color = playerManager._player.osd_back_color
        self.original_osd_size = playerManager._player.osd_font_size

    # The menu is a bit of a hack...
    # It works using multiline OSD.
    # We also have to force the window to open. 

def __init__(self):
        self.db = Database(MONGODB)
        self.ID_queue = queue.LifoQueue() 

def __init__(self, sources_parsed, max_queue_size=5):
        procs, queues, shape = [], [], []
        for source in sources_parsed:
            shape.append((int(source.h), int(source.w), 3))
            if source.url.startswith("rtsp"):
                procs.append(sp.Popen(['ffmpeg',
                                       '-loglevel', 'error',
                                       '-hwaccel', 'cuvid',
                                       '-c:v', 'h264_cuvid',
                                       '-rtsp_transport', 'tcp',
                                       '-i', os.path.expanduser(source.url),
                                       '-vf', 'hwdownload,format=nv12',
                                       '-c:v', 'rawvideo',
                                       '-f', 'rawvideo',
                                       '-pix_fmt', 'bgr24',
                                       'pipe:1'], stdin=sp.PIPE, stdout=sp.PIPE, shell=False, bufsize=int(source.h) * int(source.w) * 3 * 10))
            else:
                procs.append(sp.Popen(['ffmpeg',
                                       '-loglevel', 'error',
                                       '-hwaccel', 'cuvid',
                                       '-c:v', 'h264_cuvid',
                                       '-re',
                                       '-i', os.path.expanduser(source.url),
                                       '-vf', 'hwdownload,format=nv12',
                                       '-c:v', 'rawvideo',
                                       '-f', 'rawvideo',
                                       '-pix_fmt', 'bgr24',
                                       'pipe:1'], stdin=sp.PIPE, stdout=sp.PIPE, shell=False, bufsize=int(source.h) * int(source.w) * 3 * 10))
            queues.append(queue.LifoQueue(max_queue_size))
        self.shape = shape
        self.procs = procs
        self.queues = queues
        submit(self.source_queue, self.procs, self.queues) 

def __init__(self, webcam, batchSize=1, queueSize=256):
        # initialize the file video stream along with the boolean
        # used to indicate if the thread should be stopped or not
        self.stream = cv2.VideoCapture(int(webcam))
        assert self.stream.isOpened(), 'Cannot capture source'
        self.stopped = False
        # initialize the queue used to store frames read from
        # the video file
        self.batchSize = batchSize
        self.Q = LifoQueue(maxsize=queueSize) 

def __init__(self, detectionLoader, queueSize=1024):
        # initialize the file video stream along with the boolean
        # used to indicate if the thread should be stopped or not
        self.detectionLoader = detectionLoader
        self.stopped = False

        # initialize the queue used to store data
        self.Q = LifoQueue(maxsize=queueSize) 

def __init__(self, webcam, queueSize=256):
        # initialize the file video stream along with the boolean
        # used to indicate if the thread should be stopped or not
        self.stream = cv2.VideoCapture(int(webcam))
        assert self.stream.isOpened(), 'Cannot capture source'
        self.stopped = False
        # initialize the queue used to store frames read from
        # the video file
        self.Q = LifoQueue(maxsize=queueSize) 

def test_all_invoice(self, bitcoind, bob, carol):
        bob, carol = setup_nodes(bitcoind, [bob, carol])
        _hash, preimage = random_32_byte_hash()
        invoice_queue = queue.LifoQueue()
        invoice = carol.add_hold_invoice(
            memo="pytest hold invoice", hash=_hash, value=SEND_AMT
        )
        decoded_invoice = carol.decode_pay_req(pay_req=invoice.payment_request)
        assert isinstance(invoice, invoices_pb2.AddHoldInvoiceResp)

        # thread functions
        def inv_sub_worker(_hash):
            try:
                for _response in carol.subscribe_single_invoice(_hash):
                    invoice_queue.put(_response)
            except grpc._channel._Rendezvous:
                pass

        def pay_hold_inv_worker(payment_request):
            try:
                bob.pay_invoice(payment_request=payment_request)
            except grpc._channel._Rendezvous:
                pass

        def settle_inv_worker(_preimage):
            try:
                carol.settle_invoice(preimage=_preimage)
            except grpc._channel._Rendezvous:
                pass

        # setup the threads
        inv_sub = threading.Thread(
            target=inv_sub_worker, name="inv_sub", args=[_hash], daemon=True
        )
        pay_inv = threading.Thread(
            target=pay_hold_inv_worker, args=[invoice.payment_request]
        )
        settle_inv = threading.Thread(target=settle_inv_worker, args=[preimage])

        # start the threads
        inv_sub.start()
        # wait for subscription to start
        while not inv_sub.is_alive():
            time.sleep(0.1)
        pay_inv.start()
        time.sleep(2)
        # carol.daemon.wait_for_log(regex=f'Invoice({decoded_invoice.payment_hash}): accepted,')
        settle_inv.start()
        while settle_inv.is_alive():
            time.sleep(0.1)
        inv_sub.join(timeout=1)

        assert any(invoice.settled is True for invoice in get_updates(invoice_queue)) 

def shortest_path(self, node_id1, node_id2):
        """Find the shortest path between node1 and node2 on the graph

        Args:
            node_id1(int): Index of first node
            node_id2(int): Index of second node

        Returns(list): List of nodes from node_id1 to node_id2 that constitute
        the shortest possible path in the graph between those two nodes.
        """
        if node_id1 >= self.node_count() or node_id2 >= self.node_count():
            raise IndexError("Node ID out of range for graph")

        # Treat special case of equal inputs
        if node_id1 == node_id2:
            return [node_id1]

        # Initialize two arrays for backtracking the shortest path found
        previous = [None] * self.node_count()  # Tracks the moves
        distances = [None] * self.node_count()  # Records distance to nodes
        distances[node_id1] = 0

        node_queue = queue.LifoQueue()
        node_queue.put(node_id1)

        while not node_queue.empty():
            next_id = node_queue.get()
            if next_id == node_id2:
                break  # Success
            new_distance = distances[next_id] + 1
            # On each iteration, check if going to a neighbor node was
            # shortest path to that node, if so, add that node to the queue
            # and record distance and path that is being taken.
            for uid in self.neighbors[next_id]:
                if ((distances[self.uid_to_index[uid]] is None) or
                        (distances[self.uid_to_index[uid]] > new_distance)):
                    distances[self.uid_to_index[uid]] = new_distance
                    previous[self.uid_to_index[uid]] = next_id
                    node_queue.put(self.uid_to_index[uid])

        # Backtrack to get path
        if previous[node_id2] is None:
            raise IndexError("Unable to find target node, "
                             "possibly disconnected graph.")

        path = []
        next = node_id2
        while next is not None:
            path.append(next)
            next = previous[next]
        # Return reversed backtrack path to get in order from node 1 to 2
        return path[::-1] 

def simple_queue_test(self, q):
        if q.qsize():
            raise RuntimeError("Call this function with an empty queue")
        self.assertTrue(q.empty())
        self.assertFalse(q.full())
        # I guess we better check things actually queue correctly a little :)
        q.put(111)
        q.put(333)
        q.put(222)
        target_order = dict(Queue = [111, 333, 222],
                            LifoQueue = [222, 333, 111],
                            PriorityQueue = [111, 222, 333])
        actual_order = [q.get(), q.get(), q.get()]
        self.assertEqual(actual_order, target_order[q.__class__.__name__],
                         "Didn't seem to queue the correct data!")
        for i in range(QUEUE_SIZE-1):
            q.put(i)
            self.assertTrue(q.qsize(), "Queue should not be empty")
        self.assertTrue(not qfull(q), "Queue should not be full")
        last = 2 * QUEUE_SIZE
        full = 3 * 2 * QUEUE_SIZE
        q.put(last)
        self.assertTrue(qfull(q), "Queue should be full")
        self.assertFalse(q.empty())
        self.assertTrue(q.full())
        try:
            q.put(full, block=0)
            self.fail("Didn't appear to block with a full queue")
        except queue.Full:
            pass
        try:
            q.put(full, timeout=0.01)
            self.fail("Didn't appear to time-out with a full queue")
        except queue.Full:
            pass
        # Test a blocking put
        self.do_blocking_test(q.put, (full,), q.get, ())
        self.do_blocking_test(q.put, (full, True, 10), q.get, ())
        # Empty it
        for i in range(QUEUE_SIZE):
            q.get()
        self.assertTrue(not q.qsize(), "Queue should be empty")
        try:
            q.get(block=0)
            self.fail("Didn't appear to block with an empty queue")
        except queue.Empty:
            pass
        try:
            q.get(timeout=0.01)
            self.fail("Didn't appear to time-out with an empty queue")
        except queue.Empty:
            pass
        # Test a blocking get
        self.do_blocking_test(q.get, (), q.put, ('empty',))
        self.do_blocking_test(q.get, (True, 10), q.put, ('empty',)) 

def __init__(self, args):
        self.target_domain = args.domain
        self.cname_flag = args.cname
        if not (self.target_domain):
            print('usage: brutedns.py -h')
            sys.exit(1)

        self.check_env()
        self.level = args.level
        self.sub_dict = args.sub_file
        self.speed = args.speed
        self.default_dns = True if args.default_dns is "y" else False
        self.next_sub_dict = args.next_sub_file
        self.other_result = args.other_file

        self.timeout = 10
        self.resolver = dns.resolver.Resolver(configure=self.default_dns)
        self.resolver.lifetime = self.timeout
        self.resolver.timeout = self.timeout

        self.found_count = 0
        self.next_found_count = 0
        self.cmdline = ""
        self.queues = LifoQueue()
        self.queue_sub = Queue()
        self.cdn_set = set()
        self.cname_set = set()
        self.white_filter_subdomain = set()
        self.cname_block_dict = dict()
        self.ip_block_dict = dict()
        self.ip_all_dict = dict()
        self.ip_flag_dict = dict()
        self.active_ip_dict = dict()
        self.ip_count_dict = dict()
        self.black_ip = set()

        self.set_next_sub = self.load_next_sub_dict()
        self.set_cdn = self.load_cdn()

        self.load_sub_dict_to_queue()
        self.extract_next_sub_log()

        self.segment_num = self.judge_speed(self.speed)

        if not self.default_dns:
            self.nameservers = self.load_nameservers()
            self.check_nameservers() 

def simple_queue_test(self, q):
        if q.qsize():
            raise RuntimeError("Call this function with an empty queue")
        self.assertTrue(q.empty())
        self.assertFalse(q.full())
        # I guess we better check things actually queue correctly a little :)
        q.put(111)
        q.put(333)
        q.put(222)
        target_order = dict(Queue = [111, 333, 222],
                            LifoQueue = [222, 333, 111],
                            PriorityQueue = [111, 222, 333])
        actual_order = [q.get(), q.get(), q.get()]
        self.assertEqual(actual_order, target_order[q.__class__.__name__],
                         "Didn't seem to queue the correct data!")
        for i in range(QUEUE_SIZE-1):
            q.put(i)
            self.assertTrue(q.qsize(), "Queue should not be empty")
        self.assertTrue(not qfull(q), "Queue should not be full")
        last = 2 * QUEUE_SIZE
        full = 3 * 2 * QUEUE_SIZE
        q.put(last)
        self.assertTrue(qfull(q), "Queue should be full")
        self.assertFalse(q.empty())
        self.assertTrue(q.full())
        try:
            q.put(full, block=0)
            self.fail("Didn't appear to block with a full queue")
        except queue.Full:
            pass
        try:
            q.put(full, timeout=0.01)
            self.fail("Didn't appear to time-out with a full queue")
        except queue.Full:
            pass
        # Test a blocking put
        self.do_blocking_test(q.put, (full,), q.get, ())
        self.do_blocking_test(q.put, (full, True, 10), q.get, ())
        # Empty it
        for i in range(QUEUE_SIZE):
            q.get()
        self.assertTrue(not q.qsize(), "Queue should be empty")
        try:
            q.get(block=0)
            self.fail("Didn't appear to block with an empty queue")
        except queue.Empty:
            pass
        try:
            q.get(timeout=0.01)
            self.fail("Didn't appear to time-out with an empty queue")
        except queue.Empty:
            pass
        # Test a blocking get
        self.do_blocking_test(q.get, (), q.put, ('empty',))
        self.do_blocking_test(q.get, (True, 10), q.put, ('empty',)) 

def simple_queue_test(self, q):
        if q.qsize():
            raise RuntimeError("Call this function with an empty queue")
        self.assertTrue(q.empty())
        self.assertFalse(q.full())
        # I guess we better check things actually queue correctly a little :)
        q.put(111)
        q.put(333)
        q.put(222)
        target_order = dict(Queue = [111, 333, 222],
                            LifoQueue = [222, 333, 111],
                            PriorityQueue = [111, 222, 333])
        actual_order = [q.get(), q.get(), q.get()]
        self.assertEqual(actual_order, target_order[q.__class__.__name__],
                         "Didn't seem to queue the correct data!")
        for i in range(QUEUE_SIZE-1):
            q.put(i)
            self.assertTrue(q.qsize(), "Queue should not be empty")
        self.assertTrue(not qfull(q), "Queue should not be full")
        last = 2 * QUEUE_SIZE
        full = 3 * 2 * QUEUE_SIZE
        q.put(last)
        self.assertTrue(qfull(q), "Queue should be full")
        self.assertFalse(q.empty())
        self.assertTrue(q.full())
        try:
            q.put(full, block=0)
            self.fail("Didn't appear to block with a full queue")
        except queue.Full:
            pass
        try:
            q.put(full, timeout=0.01)
            self.fail("Didn't appear to time-out with a full queue")
        except queue.Full:
            pass
        # Test a blocking put
        self.do_blocking_test(q.put, (full,), q.get, ())
        self.do_blocking_test(q.put, (full, True, 10), q.get, ())
        # Empty it
        for i in range(QUEUE_SIZE):
            q.get()
        self.assertTrue(not q.qsize(), "Queue should be empty")
        try:
            q.get(block=0)
            self.fail("Didn't appear to block with an empty queue")
        except queue.Empty:
            pass
        try:
            q.get(timeout=0.01)
            self.fail("Didn't appear to time-out with an empty queue")
        except queue.Empty:
            pass
        # Test a blocking get
        self.do_blocking_test(q.get, (), q.put, ('empty',))
        self.do_blocking_test(q.get, (True, 10), q.put, ('empty',))