python3 pySerial TypeError: unicode strings are not supported, please encode to bytes:

Question

In Python 3 I imported the pySerial library so I could communicate with my Arduino Uno by serial commands.
It worked very well in Python 2.7 but in Python 3 I keep running into a error it says this

TypeError: unicode strings are not supported, please encode to bytes: 'allon'

In Python 2.7 the only thing I did differently is use raw_input but I don't know what is happening in Python 3. Here is my code

import serial, time import tkinter import os  def serialcmdw():     os.system('clear')     serialcmd = input("serial command: ")     ser.write (serialcmd)  serialcmdw()  ser = serial.Serial() os.system('clear') ser.port = "/dev/cu.usbmodem4321" ser.baudrate = 9600 ser.open() time.sleep(1) serialcmdw() 

Answer 1

Encode your data which you are writing to serial,in your case "serialcmd" to bytes.try the following :

ser.write(serialcmd.encode())