"""cbreak <enter> test"""importsysimportttyimportselectimporttermiosfromtimeimportsleep# save stdin attributesprevStdinAttributes=termios.tcgetattr(sys.stdin)# set cbreak mode:# "Enter cbreak mode. In cbreak mode (sometimes called “rare” mode) normal tty line buffering#  is turned off and characters are available to be read one by one. However, unlike raw mode,#  special characters (interrupt, quit, suspend, and flow control) retain their effects on the#  tty driver and calling program. Calling first raw() then cbreak() leaves the terminal in cbreak mode."tty.setcbreak(sys.stdin,when=termios.TCSANOW)c=b''# wait for a bytewhileTrue:ifselect.select([sys.stdin], [], [],0)== ([sys.stdin], [], []):c=sys.stdin.buffer.read1(1)breaksleep(.1)# restore stdin attributestermios.tcsetattr(sys.stdin,termios.TCSADRAIN,prevStdinAttributes)# print result byte in hexprint(f"bytes: '\\x{c.hex().upper()}'")