python接收字符并回显

# -*- coding: utf-8 -*
import serial
import time
# 打开串口
ser = serial.Serial("/dev/ttyAMA0", 9600) #"/dev/ttyAMA0"为树莓派串口 win7为com7
def main():
while True:
# 获得接收缓冲区字符
count = ser.inWaiting()
if count != 0:
# 读取内容并回显
recv = ser.read(count)
ser.write(recv)
# 清空接收缓冲区
ser.flushInput()
# 必要的软件延时
time.sleep(0.1) if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
if ser != None:
ser.close()