Shulou(Shulou.com)06/03 Report--

# pip install blinkerfrom blinker import signals = signal ('semaphores ')def each(num): print("each {}".format(num))def full_singal(num): print("full_time {}".format(num))s.connect(each)s.connect(full_singal, sender = 2)for num in range(1, 4): s.send(num) The result is as follows: each 1each 2round 2each 3#or abbreviated:from blinker import signals = signal("test start")@s.connectdef each(round) print("each {}".format(round))Flask built-in signal: flask.template_rendered: sent when template rendering is successful, this signal is called together with the dictionary of template instance template context. Flask.request_started: After the request context is established, sent before request processing begins, subscribers can access the request using standard proxies such as request. flask.request_finished: Sent before the response is sent to the client, may pass a response. flask.got_request_exception: Sent when an exception is thrown in request processing, the exception itself is passed to the subscription function via execution. Flask.request_tearing_down: Sent when destruction is requested, it is always called, even if an exception occurs. Flask.appcontext_tearing_down: Sent when application context is destroyed, it is always called, even if an exception occurs.

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