Show real time temperature and storage with Python

[linkxxx]

import serial
import matplotlib.pyplot as plt
from drawnow import *

values = []
plt.ion()
cnt=0

serialArduino = serial.Serial('COM3', 115200)

def plotValues():
    plt.title('Serial value from Arduino')
    plt.grid(True)
    plt.ylabel('Values')
    plt.plot(values, 'rx-', label='values')
    plt.legend(loc='upper right')

#pre-load dummy data

    
while True:
    while (serialArduino.inWaiting()==0):
        pass
    valueRead = serialArduino.readline()
    print(valueRead)

I'm getting the temperatures like this:
---------------------------------------
b'27.39 , 27.22\r\n'
b'27.35 , 27.27\r\n'
b'27.44 , 27.33\r\n'
b'27.41 , 27.37\r\n'
b'27.39 , 27.33\r\n'
-------------------------------------------------
How I can fix this error and get clean result, and also how I can graph in real time and storage the data?

Thank you so much for the help.