【python3】问题记录
2018-03-14 本文已影响107人
下里巴人也
参考:http://www.liujiangblog.com/course/python/76
今天把python2的代码修改兼容python3的几个问题:
- from Queue import Queue修改为from queue import Queue
- import thread修改为import _thread
- print修改
- socket修改:python3发消息需要encode消息buf,接收消息需要decode消息buf:
接收消息:
flag, msg_buf = self.__tcp_client.recv(512)
logger.info("recv msg from mc: %s", msg_buf)
msg_buf = msg_buf.decode()
发送消息:
flag = self.__tcp_client.send(msg.encode())
- opencv库 imshow在线程里调用,会有如下问题:
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
python: xcb_io.c:165: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed.
Aborted (core dumped)
原因是:线程里使用imshow问题
解决方法:
显示代码:
cv2.putText(output_rgb,
"FPS: %f" % (fps),
(10, 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5,
(0, 255, 0), 2)
cv2.imshow(video_name, output_rgb)
fps_time = time.time()
if cv2.waitKey(1) & 0xFF == ord('q'):
logger.warn("exit for waitKey!")
break
修改为(imshow之前先调下cv2.namedWindow()):
cv2.putText(output_rgb,
"FPS: %f" % (fps),
(10, 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5,
(0, 255, 0), 2)
cv2.namedWindow(video_name)
cv2.imshow(video_name, output_rgb)
fps_time = time.time()
if cv2.waitKey(1) & 0xFF == ord('q'):
logger.warn("exit for waitKey!")
break
- python3的二维列表使用问题