How to use 'waitkey opencv' in Python

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264def wait_for_key(stdscr):
265 curses.init_pair(1, curses.COLOR_RED, curses.COLOR_WHITE)
266 stdscr.addstr(0,0, "Press any key to stop!", curses.color_pair(1) )
267 stdscr.refresh()
268 c = 0
269 while not rospy.is_shutdown() and c == 0:
270 c = stdscr.getch()
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