String error

[Kurta]

Hey there im not getting the expected result

i expect two numbers temperture and humidty seperated by a comma

here is my error:

line 25, in <module>
dataArray = arduinoString.split(",")

TypeError: a bytes-like object is required, not 'str'

my python code

import serial
import numpy
import matplotlib.pyplot as plt
#from drawnow import 



arduinoData = serial.Serial('com3', 9600)



while True:
    while (arduinoData.inWaiting() ==0):
        pass
     
    arduinoString = arduinoData.readline()
    dataArray = arduinoString.split(",")
    temp = float(dataArray[0])
    humid = float(dataArray[1])
    
    print (temp, ",", humid)
  

what i Expected:

70 , 50

using python 3.7