Home > Article > Backend Development > How to Implement a Keyboard Handler Using a BlockingQueue in Python?
One of the simplest ways of implementing a keyboard handler that will call a function every time it receives a key press (this will work on both Linux and Windows) is to use a BlockingQueue and a thread that will place the key in the queue when it is pressed, and the queue will get it later in your code. Here's a simple implementation:
<code class="python">import queue import sys import threading # blocking q = queue.Queue() last_input = 0.0 def input_thread(q): global last_input while True: ch = sys.stdin.read(1) last_input = time.time() print("got key: '{}'".format(ch)) q.put(ch) if __name__ == '__main__': t = threading.Thread(target=input_thread, args=(q,)) t.daemon = True t.start() last_input_time = last_input while True: if not q.empty() and (time.time() - last_input) < 5: print("polling '{}' in the queue".format(q.get())) if time.time() - last_input_time > 5: print("nothing in the queue for a while") raise RuntimeError("no input")</code>
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