 
      
      serial::readln()
	Read from the serial port until eol_char is received	
	
serial::readln(eol_char = "\n")
eol_char (string, optional)  — A string to match. The default value is "\n"
string — Returns the string containing the data
import serial
 
arduino = serial("/dev/ttyACM0")
 
if !arduino.is_open()
    exit(arduino.get_error())
endif
 
data = arduino.readln()
writeln(data)
 
arduino.close()