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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