python subprocess Popen非阻塞，读取adb日志

from threading  import Thread
from queue import Queue, Empty
import shlex
if __name__ == '__main__':
    print_hi('PyCharm')

    # Car().run()

    def enqueue_output(stdout, queue):
        with open("www.log", 'wb+') as wwwf:
            for line in iter(stdout.readline,b''):
                # print("line",line)
                wwwf.write(line)
                queue.put(line)


    subprocess.Popen("adb logcat -c", stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, close_fds=True)
    process = subprocess.Popen("adb logcat", stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, close_fds=True)

    q = Queue()
    t = Thread(target=enqueue_output, args=(process.stdout, q))

    t.daemon = True  # thread dies with the program
    t.start()

    try:
        # line = q.get_nowait()  # or q.get(timeout=.1)
        line =  q.get(timeout=3)  # or q.get(timeout=.1)
    except Empty:
        print('no output yet')
    else:  # got line
        input("请输入：")