How to improve this code (in terms of OOP)?

Question

Python

class MicroPythonBoard():

    def __init__(self, port, baudrate):
        self.serialPort=serial.Serial(port, baudrate)
    
    def putCursorOnNewLine(self):
        self.serialPort.write(b"\r")

    def writeln(self, string):
        """ Write a line to serial poart """
        self.serialPort.write( bytes(string, "ascii"))
        self.putCursorOnNewLine()
    

    def write(self, string):
        """write a string to serial port """
        self.serialPort.write( bytes(string, "ascii") )


    def writeFile(self, pathToFile, fileName):
        """
        pathToFile - path to file on your computer
        fileName - Name of file on your MicroPython board
        """
        with open(pathToFile) as file:
            
            self.serialPort.write((chr(5).encode("ascii"))) # write <CTRL+E> (PASTE MODE)

            self.serialPort.write((f'with(open("{fileName}", "w")) as f:').encode("ascii"))

            self.putCursorOnNewLine()

            self.serialPort.write(b"    f.write(r'''")

            self.putCursorOnNewLine()

            for line in file.readlines():
                self.serialPort.write(line.encode("ascii"))
            
            self.putCursorOnNewLine()
            self.serialPort.write(b"''')")

            self.serialPort.write(chr(4).encode("ascii")) # write <CTRL+D> (CLOSE PASTE MODE)

            print("DONE")
    
    def readLastLine(self):
        all_text=self.serialPort.read_all()
        last_line=all_text.split(b"\r")[-1]
        return last_line

Answer 1

Even if it's not for me to say. But OOP is moving towards minimizing duplicate lines that do the same job.
For example. The same line is repeated here.

self.serialPort.write( bytes(string, "ascii") )

def writeln(self, string):
        """ Write a line to serial poart """
        self.serialPort.write( bytes(string, "ascii"))
        self.putCursorOnNewLine()
    

    def write(self, string):
        """write a string to serial port """
        self.serialPort.write( bytes(string, "ascii") )

So everything can be reduced to one function by just adding one more input parameter

reduce to one function

def write(self, string, nextline=False):
        """write a string to serial port """
        self.serialPort.write( bytes(string, "ascii") )
        if nextline:
            self.putCursorOnNewLine()

#И далее вызывать, функцию write('text') как и раньше, а функцию writeln - как write('text', True)