import serial
def port():
	port_type = int(raw_input('Enter the port type (/dev/ttyUSB - "1" |  /dev?ttyACM - "2" ): '))
	return port_type
	def port_t(port_type):
		if port_type == int(1):
			num = int(raw_input('Enter the port number (/dev/ttyUSBx): '))
			adress_a = str('/dev/ttyUSB')
		elif port_type == int(2):
			num = int(raw_input('Enter the port number (/dev/ttyACMx): '))
			adress_a = str('/dev/ttyACM')
		else:
			print 'Invalid Input!'
		return num, adress_a
		def number(num):
			port_number = str(num)
			adress = str(adress_a + port_number)
			return adress
port()
print adress

 def port():
	port_type = int(raw_input('Enter the port type (/dev/ttyUSB - "1" |  /dev?ttyACM - "2" ): '))
	return port_type

 tenebras@meteolab:~/PyProg/Arduino$ python ttyUSBx.py
Enter the port type (/dev/ttyUSB - "1" |  /dev?ttyACM - "2" ): 1