class Serial:
    def __init__(self, port, baudrate, bytesize, parity, stopbits, timeout, xonxoff, rtscts):
        pass #self.portstr = ''
    def read(self, n):
        return ''
    def write(self, s):
        pass
    def close(self):
        pass
    def flushInput(self):
        pass
    def flushOutput(self):
        pass
    def setBaudrate(self, n):
        pass
    def setDTR(self, n):
        pass
    def setRTS(self, n):
        pass