1ValueError -1 2ValueError 0 3UART 1 4UART 2 5ValueError 5 6UART 6 7UART(1, baudrate=9600, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=3, rxbuf=64) 8UART(1, baudrate=2400, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=7, rxbuf=64) 90 103 114 12None 131 144 15None 16None 17UART(1, baudrate=9600, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=3, rxbuf=8) 18UART(1, baudrate=9600, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=3, rxbuf=0) 19UART(1, baudrate=9600, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=3, rxbuf=4) 20UART(1, baudrate=9600, bits=8, parity=None, stop=1, flow=0, timeout=0, timeout_char=3, rxbuf=0) 21